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<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
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  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedLabel"/>
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedTotalLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedTotalLabel"/>
  <link:labelLink xlink:role="http://www.xbrl.org/2003/role/link" xlink:type="extended">
    <link:label id="lab_ifrs-full_DisclosureOfContingentLiabilitiesLineItems_77338332-e68b-4d97-a974-f57fe6438c47_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfContingentLiabilitiesLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure of contingent liabilities [line items]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfContingentLiabilitiesLineItems_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfContingentLiabilitiesLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of contingent liabilities [line items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfContingentLiabilitiesLineItems" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfContingentLiabilitiesLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesLineItems" xlink:to="lab_ifrs-full_DisclosureOfContingentLiabilitiesLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_AnthonyManciniMember_bea441ea-5b2f-4aa8-8046-9f88eeb649a5_terseLabel_en-US" xlink:label="lab_gmab_AnthonyManciniMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Anthony Mancini</link:label>
    <link:label id="lab_gmab_AnthonyManciniMember_label_en-US" xlink:label="lab_gmab_AnthonyManciniMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Anthony Mancini [Member]</link:label>
    <link:label id="lab_gmab_AnthonyManciniMember_documentation_en-US" xlink:label="lab_gmab_AnthonyManciniMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents information pertaining to Anthony Mancini.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_AnthonyManciniMember" xlink:href="gmab-20251231.xsd#gmab_AnthonyManciniMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_AnthonyManciniMember" xlink:to="lab_gmab_AnthonyManciniMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfGeographicalAreasLineItems_94810d23-f260-46bd-bcd4-83d4b4596e17_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfGeographicalAreasLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure of geographical areas [line items]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfGeographicalAreasLineItems_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfGeographicalAreasLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of geographical areas [line items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfGeographicalAreasLineItems" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfGeographicalAreasLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfGeographicalAreasLineItems" xlink:to="lab_ifrs-full_DisclosureOfGeographicalAreasLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_KeyManagementPersonnelCompensationCommitteeFees_f7d3b538-a975-4e41-aa17-0aacf207d0c2_terseLabel_en-US" xlink:label="lab_gmab_KeyManagementPersonnelCompensationCommitteeFees" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Committee Fees</link:label>
    <link:label id="lab_gmab_KeyManagementPersonnelCompensationCommitteeFees_label_en-US" xlink:label="lab_gmab_KeyManagementPersonnelCompensationCommitteeFees" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Key Management Personnel Compensation, Committee Fees</link:label>
    <link:label id="lab_gmab_KeyManagementPersonnelCompensationCommitteeFees_documentation_en-US" xlink:label="lab_gmab_KeyManagementPersonnelCompensationCommitteeFees" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The amount of committee fees paid by the key management personnel.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_KeyManagementPersonnelCompensationCommitteeFees" xlink:href="gmab-20251231.xsd#gmab_KeyManagementPersonnelCompensationCommitteeFees"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_KeyManagementPersonnelCompensationCommitteeFees" xlink:to="lab_gmab_KeyManagementPersonnelCompensationCommitteeFees" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_ElizabethOFarrellMember_a5fa0059-6bb5-47e2-bfa0-f1584d3c94cd_terseLabel_en-US" xlink:label="lab_gmab_ElizabethOFarrellMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Elizabeth O&#8217;Farrell</link:label>
    <link:label id="lab_gmab_ElizabethOFarrellMember_label_en-US" xlink:label="lab_gmab_ElizabethOFarrellMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Elizabeth O'Farrell [Member]</link:label>
    <link:label id="lab_gmab_ElizabethOFarrellMember_documentation_en-US" xlink:label="lab_gmab_ElizabethOFarrellMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents information pertaining to Elizabeth O'Farrell.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_ElizabethOFarrellMember" xlink:href="gmab-20251231.xsd#gmab_ElizabethOFarrellMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_ElizabethOFarrellMember" xlink:to="lab_gmab_ElizabethOFarrellMember" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_InterestCoverageRatio_019c57d3-2edc-712d-9076-00e26f592840_terseLabel_en-US" xlink:label="lab_gmab_InterestCoverageRatio" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Interest coverage ratio</link:label>
    <link:label id="lab_gmab_InterestCoverageRatio_label_en-US" xlink:label="lab_gmab_InterestCoverageRatio" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Interest Coverage Ratio</link:label>
    <link:label id="lab_gmab_InterestCoverageRatio_documentation_en-US" xlink:label="lab_gmab_InterestCoverageRatio" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Interest Coverage Ratio</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_InterestCoverageRatio" xlink:href="gmab-20251231.xsd#gmab_InterestCoverageRatio"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_InterestCoverageRatio" xlink:to="lab_gmab_InterestCoverageRatio" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_f3cc17ea-0e26-49ca-9b46-d5ccf62fd937_negatedLabel_en-US" xlink:label="lab_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Investment in tangible assets</link:label>
    <link:label id="lab_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_label_en-US" xlink:label="lab_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Purchase of property, plant and equipment, classified as investing activities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities" xlink:to="lab_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_CapitalStructureFinancialRiskAndRelatedItemsAbstract_label_en-US" xlink:label="lab_gmab_CapitalStructureFinancialRiskAndRelatedItemsAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Capital Structure, Financial Risk And Related Items [Abstract]</link:label>
    <link:label id="lab_gmab_CapitalStructureFinancialRiskAndRelatedItemsAbstract_documentation_en-US" xlink:label="lab_gmab_CapitalStructureFinancialRiskAndRelatedItemsAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Capital Structure, Financial Risk And Related Items</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_CapitalStructureFinancialRiskAndRelatedItemsAbstract" xlink:href="gmab-20251231.xsd#gmab_CapitalStructureFinancialRiskAndRelatedItemsAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_CapitalStructureFinancialRiskAndRelatedItemsAbstract" xlink:to="lab_gmab_CapitalStructureFinancialRiskAndRelatedItemsAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_WagesAndSalaries_44ac573c-ccdc-477d-b72f-23d50610f772_terseLabel_en-US" xlink:label="lab_ifrs-full_WagesAndSalaries" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Wages and salaries</link:label>
    <link:label id="lab_ifrs-full_WagesAndSalaries_label_en-US" xlink:label="lab_ifrs-full_WagesAndSalaries" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Wages and salaries</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_WagesAndSalaries" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_WagesAndSalaries"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_WagesAndSalaries" xlink:to="lab_ifrs-full_WagesAndSalaries" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityFileNumber_019b0ccd-ab91-7522-aa51-c12b2021adb0_terseLabel_en-US" xlink:label="lab_dei_EntityFileNumber" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity File Number</link:label>
    <link:label id="lab_dei_EntityFileNumber_label_en-US" xlink:label="lab_dei_EntityFileNumber" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity File Number</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityFileNumber"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityFileNumber" xlink:to="lab_dei_EntityFileNumber" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfBusinessCombinationsLineItems_591846eb-f29c-4434-8f5c-b446178f8983_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfBusinessCombinationsLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure of detailed information about business combination [line items]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfBusinessCombinationsLineItems_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfBusinessCombinationsLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of detailed information about business combination [line items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfBusinessCombinationsLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems" xlink:to="lab_ifrs-full_DisclosureOfBusinessCombinationsLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_CollaborativeArrangementAndArrangementOtherThanCollaborativeLineItems_bb7f1f6d-926d-49b0-81f8-dc68cd507a2c_terseLabel_en-US" xlink:label="lab_gmab_CollaborativeArrangementAndArrangementOtherThanCollaborativeLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]</link:label>
    <link:label id="lab_gmab_CollaborativeArrangementAndArrangementOtherThanCollaborativeLineItems_label_en-US" xlink:label="lab_gmab_CollaborativeArrangementAndArrangementOtherThanCollaborativeLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]</link:label>
    <link:label id="lab_gmab_CollaborativeArrangementAndArrangementOtherThanCollaborativeLineItems_documentation_en-US" xlink:label="lab_gmab_CollaborativeArrangementAndArrangementOtherThanCollaborativeLineItems" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_CollaborativeArrangementAndArrangementOtherThanCollaborativeLineItems" xlink:href="gmab-20251231.xsd#gmab_CollaborativeArrangementAndArrangementOtherThanCollaborativeLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_CollaborativeArrangementAndArrangementOtherThanCollaborativeLineItems" xlink:to="lab_gmab_CollaborativeArrangementAndArrangementOtherThanCollaborativeLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_DescriptionOfAccountingPolicyForAcquisitionAndIntegrationRelatedChargesPolicyTextBlock_019c5164-6014-7747-8d43-cf13a886a713_terseLabel_en-US" xlink:label="lab_gmab_DescriptionOfAccountingPolicyForAcquisitionAndIntegrationRelatedChargesPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Acquisition and Integration Related Charges</link:label>
    <link:label id="lab_gmab_DescriptionOfAccountingPolicyForAcquisitionAndIntegrationRelatedChargesPolicyTextBlock_label_en-US" xlink:label="lab_gmab_DescriptionOfAccountingPolicyForAcquisitionAndIntegrationRelatedChargesPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Description Of Accounting Policy For Acquisition And Integration Related Charges [Policy Text Block]</link:label>
    <link:label id="lab_gmab_DescriptionOfAccountingPolicyForAcquisitionAndIntegrationRelatedChargesPolicyTextBlock_documentation_en-US" xlink:label="lab_gmab_DescriptionOfAccountingPolicyForAcquisitionAndIntegrationRelatedChargesPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Description Of Accounting Policy For Acquisition And Integration Related Charges</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_DescriptionOfAccountingPolicyForAcquisitionAndIntegrationRelatedChargesPolicyTextBlock" xlink:href="gmab-20251231.xsd#gmab_DescriptionOfAccountingPolicyForAcquisitionAndIntegrationRelatedChargesPolicyTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_DescriptionOfAccountingPolicyForAcquisitionAndIntegrationRelatedChargesPolicyTextBlock" xlink:to="lab_gmab_DescriptionOfAccountingPolicyForAcquisitionAndIntegrationRelatedChargesPolicyTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_ScheduleOfSegmentDisclosuresInFinancialStatementsTableTextBlock_9ae36d36-67b8-4da4-b9ea-f2f031bbc466_terseLabel_en-US" xlink:label="lab_gmab_ScheduleOfSegmentDisclosuresInFinancialStatementsTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of segment disclosures in the financial statements as the group's business activities.</link:label>
    <link:label id="lab_gmab_ScheduleOfSegmentDisclosuresInFinancialStatementsTableTextBlock_label_en-US" xlink:label="lab_gmab_ScheduleOfSegmentDisclosuresInFinancialStatementsTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule Of Segment Disclosures In Financial Statements [Table Text Block]</link:label>
    <link:label id="lab_gmab_ScheduleOfSegmentDisclosuresInFinancialStatementsTableTextBlock_documentation_en-US" xlink:label="lab_gmab_ScheduleOfSegmentDisclosuresInFinancialStatementsTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Tabular disclosure for segment disclosures in the financial statements as the group's business activities.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_ScheduleOfSegmentDisclosuresInFinancialStatementsTableTextBlock" xlink:href="gmab-20251231.xsd#gmab_ScheduleOfSegmentDisclosuresInFinancialStatementsTableTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_ScheduleOfSegmentDisclosuresInFinancialStatementsTableTextBlock" xlink:to="lab_gmab_ScheduleOfSegmentDisclosuresInFinancialStatementsTableTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_LevelsOfFairValueHierarchyDomain_8bf08302-c537-4640-a0da-f3c02e6f4d0e_terseLabel_en-US" xlink:label="lab_ifrs-full_LevelsOfFairValueHierarchyDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Levels of fair value hierarchy [domain]</link:label>
    <link:label id="lab_ifrs-full_LevelsOfFairValueHierarchyDomain_label_en-US" xlink:label="lab_ifrs-full_LevelsOfFairValueHierarchyDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Levels of fair value hierarchy [domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LevelsOfFairValueHierarchyDomain" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LevelsOfFairValueHierarchyDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_LevelsOfFairValueHierarchyDomain" xlink:to="lab_ifrs-full_LevelsOfFairValueHierarchyDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_AnthonyPaganoMember_86f52a57-e488-43f3-b062-26c9e5c4ab95_terseLabel_en-US" xlink:label="lab_gmab_AnthonyPaganoMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Anthony Pagano</link:label>
    <link:label id="lab_gmab_AnthonyPaganoMember_label_en-US" xlink:label="lab_gmab_AnthonyPaganoMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Anthony Pagano [Member]</link:label>
    <link:label id="lab_gmab_AnthonyPaganoMember_documentation_en-US" xlink:label="lab_gmab_AnthonyPaganoMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents information pertaining to Anthony Pagano.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_AnthonyPaganoMember" xlink:href="gmab-20251231.xsd#gmab_AnthonyPaganoMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_AnthonyPaganoMember" xlink:to="lab_gmab_AnthonyPaganoMember" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_OtherPayablesExcludingProvisionsMember_d0ea98a3-fd39-4b87-94f3-2b1adb3357a2_terseLabel_en-US" xlink:label="lab_gmab_OtherPayablesExcludingProvisionsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other payables excluding provisions</link:label>
    <link:label id="lab_gmab_OtherPayablesExcludingProvisionsMember_label_en-US" xlink:label="lab_gmab_OtherPayablesExcludingProvisionsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Payables Excluding Provisions [Member]</link:label>
    <link:label id="lab_gmab_OtherPayablesExcludingProvisionsMember_documentation_en-US" xlink:label="lab_gmab_OtherPayablesExcludingProvisionsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This member stands for other payables.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_OtherPayablesExcludingProvisionsMember" xlink:href="gmab-20251231.xsd#gmab_OtherPayablesExcludingProvisionsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_OtherPayablesExcludingProvisionsMember" xlink:to="lab_gmab_OtherPayablesExcludingProvisionsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_LaterThanTwoYearsAndNotLaterThanThreeYearsMember_33fa7d88-3a05-4ffa-b61b-d2c1cdc6de6f_verboseLabel_en-US" xlink:label="lab_ifrs-full_LaterThanTwoYearsAndNotLaterThanThreeYearsMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">2027</link:label>
    <link:label id="lab_ifrs-full_LaterThanTwoYearsAndNotLaterThanThreeYearsMember_label_en-US" xlink:label="lab_ifrs-full_LaterThanTwoYearsAndNotLaterThanThreeYearsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Later than two years and not later than three years [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LaterThanTwoYearsAndNotLaterThanThreeYearsMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LaterThanTwoYearsAndNotLaterThanThreeYearsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_LaterThanTwoYearsAndNotLaterThanThreeYearsMember" xlink:to="lab_ifrs-full_LaterThanTwoYearsAndNotLaterThanThreeYearsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CashAndCashEquivalentsAbstract_ab7b6e70-1b64-44a8-888b-2300235c8335_terseLabel_en-US" xlink:label="lab_ifrs-full_CashAndCashEquivalentsAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash and cash equivalents include:</link:label>
    <link:label id="lab_ifrs-full_CashAndCashEquivalentsAbstract_label_en-US" xlink:label="lab_ifrs-full_CashAndCashEquivalentsAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash and cash equivalents [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashAndCashEquivalentsAbstract" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CashAndCashEquivalentsAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CashAndCashEquivalentsAbstract" xlink:to="lab_ifrs-full_CashAndCashEquivalentsAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DeferredTaxLiabilitiesRecognisedAsOfAcquisitionDate_d4ab4842-f475-439a-ac59-b49484ded9b2_negatedLabel_en-US" xlink:label="lab_ifrs-full_DeferredTaxLiabilitiesRecognisedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Deferred tax liability</link:label>
    <link:label id="lab_ifrs-full_DeferredTaxLiabilitiesRecognisedAsOfAcquisitionDate_label_en-US" xlink:label="lab_ifrs-full_DeferredTaxLiabilitiesRecognisedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deferred tax liabilities recognised as of acquisition date</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DeferredTaxLiabilitiesRecognisedAsOfAcquisitionDate" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DeferredTaxLiabilitiesRecognisedAsOfAcquisitionDate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DeferredTaxLiabilitiesRecognisedAsOfAcquisitionDate" xlink:to="lab_ifrs-full_DeferredTaxLiabilitiesRecognisedAsOfAcquisitionDate" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_OtherTaxEffectsForReconciliationBetweenAccountingProfitAndTaxExpenseIncome_2d7fe7cf-8447-471a-b572-7b64e15907f7_terseLabel_en-US" xlink:label="lab_ifrs-full_OtherTaxEffectsForReconciliationBetweenAccountingProfitAndTaxExpenseIncome" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other current and deferred tax adjustments</link:label>
    <link:label id="lab_ifrs-full_OtherTaxEffectsForReconciliationBetweenAccountingProfitAndTaxExpenseIncome_label_en-US" xlink:label="lab_ifrs-full_OtherTaxEffectsForReconciliationBetweenAccountingProfitAndTaxExpenseIncome" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other tax effects for reconciliation between accounting profit and tax expense (income)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherTaxEffectsForReconciliationBetweenAccountingProfitAndTaxExpenseIncome" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherTaxEffectsForReconciliationBetweenAccountingProfitAndTaxExpenseIncome"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OtherTaxEffectsForReconciliationBetweenAccountingProfitAndTaxExpenseIncome" xlink:to="lab_ifrs-full_OtherTaxEffectsForReconciliationBetweenAccountingProfitAndTaxExpenseIncome" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_FinanceIncomeCost_8dec862f-01e1-44ac-b2da-dd62248b7ae2_totalLabel_en-US" xlink:label="lab_ifrs-full_FinanceIncomeCost" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net financial items</link:label>
    <link:label id="lab_ifrs-full_FinanceIncomeCost_label_en-US" xlink:label="lab_ifrs-full_FinanceIncomeCost" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance income (cost)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinanceIncomeCost" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinanceIncomeCost"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_FinanceIncomeCost" xlink:to="lab_ifrs-full_FinanceIncomeCost" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForFairValueMeasurementExplanatory_019bc733-1005-7ffa-bce0-c5268c862b85_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForFairValueMeasurementExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair value measurement</link:label>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForFairValueMeasurementExplanatory_label_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForFairValueMeasurementExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Description of accounting policy for fair value measurement [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForFairValueMeasurementExplanatory" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DescriptionOfAccountingPolicyForFairValueMeasurementExplanatory"/>
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    <link:label id="lab_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable_d5b60124-c6a8-4109-94ad-4069582c9e2f_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure of detailed information about borrowings [table]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of detailed information about borrowings [table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable" xlink:to="lab_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfTreasurySharesExplanatory_cec0d8af-62dd-4b75-85be-dfd203d71b44_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfTreasurySharesExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of treasury shares</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfTreasurySharesExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfTreasurySharesExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of treasury shares [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfTreasurySharesExplanatory" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfTreasurySharesExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfTreasurySharesExplanatory" xlink:to="lab_ifrs-full_DisclosureOfTreasurySharesExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_IntangibleAssetsAndGoodwill_57929f47-5352-441e-a9f8-13807f67236f_periodStartLabel_en-US" xlink:label="lab_ifrs-full_IntangibleAssetsAndGoodwill" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Intangible assets and goodwill at beginning of period</link:label>
    <link:label id="lab_ifrs-full_IntangibleAssetsAndGoodwill_a2147483-23c1-4931-a197-6d9bfa0a46ff_periodEndLabel_en-US" xlink:label="lab_ifrs-full_IntangibleAssetsAndGoodwill" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Intangible assets and goodwill at end of period</link:label>
    <link:label id="lab_ifrs-full_IntangibleAssetsAndGoodwill_label_en-US" xlink:label="lab_ifrs-full_IntangibleAssetsAndGoodwill" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Intangible assets and goodwill</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IntangibleAssetsAndGoodwill" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IntangibleAssetsAndGoodwill"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_IntangibleAssetsAndGoodwill" xlink:to="lab_ifrs-full_IntangibleAssetsAndGoodwill" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_StatementOfChangesInEquityLineItems_6be31f1a-f7f4-4385-afc5-e44530641619_terseLabel_en-US" xlink:label="lab_ifrs-full_StatementOfChangesInEquityLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Statement of changes in equity [line items]</link:label>
    <link:label id="lab_ifrs-full_StatementOfChangesInEquityLineItems_label_en-US" xlink:label="lab_ifrs-full_StatementOfChangesInEquityLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Statement of changes in equity [line items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_StatementOfChangesInEquityLineItems" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_StatementOfChangesInEquityLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems" xlink:to="lab_ifrs-full_StatementOfChangesInEquityLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_PrivatelyHeldEquitySecuritiesMember_4cd2458c-5830-46e8-93e1-b82c50ab9c28_terseLabel_en-US" xlink:label="lab_gmab_PrivatelyHeldEquitySecuritiesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Privately held equity securities</link:label>
    <link:label id="lab_gmab_PrivatelyHeldEquitySecuritiesMember_label_en-US" xlink:label="lab_gmab_PrivatelyHeldEquitySecuritiesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Privately Held Equity Securities [member]</link:label>
    <link:label id="lab_gmab_PrivatelyHeldEquitySecuritiesMember_documentation_en-US" xlink:label="lab_gmab_PrivatelyHeldEquitySecuritiesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This member stands for privately held equity securities.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_PrivatelyHeldEquitySecuritiesMember" xlink:href="gmab-20251231.xsd#gmab_PrivatelyHeldEquitySecuritiesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_PrivatelyHeldEquitySecuritiesMember" xlink:to="lab_gmab_PrivatelyHeldEquitySecuritiesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_AdjustmentsForInterestOnLeasePayments_5fe2ef36-3731-42e3-abf7-ad6d8932e68d_terseLabel_en-US" xlink:label="lab_gmab_AdjustmentsForInterestOnLeasePayments" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Interest elements of lease payments</link:label>
    <link:label id="lab_gmab_AdjustmentsForInterestOnLeasePayments_label_en-US" xlink:label="lab_gmab_AdjustmentsForInterestOnLeasePayments" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Adjustments For Interest On Lease Payments</link:label>
    <link:label id="lab_gmab_AdjustmentsForInterestOnLeasePayments_documentation_en-US" xlink:label="lab_gmab_AdjustmentsForInterestOnLeasePayments" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Adjustments for interest on lease payments to reconcile profit (loss) to net cash flow from (used in) operating activities.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_AdjustmentsForInterestOnLeasePayments" xlink:href="gmab-20251231.xsd#gmab_AdjustmentsForInterestOnLeasePayments"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_AdjustmentsForInterestOnLeasePayments" xlink:to="lab_gmab_AdjustmentsForInterestOnLeasePayments" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_NumberOfOperatingSegment1_019c5202-856e-7619-9e32-d09c1d227f1b_terseLabel_en-US" xlink:label="lab_gmab_NumberOfOperatingSegment1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of operating segment</link:label>
    <link:label id="lab_gmab_NumberOfOperatingSegment1_label_en-US" xlink:label="lab_gmab_NumberOfOperatingSegment1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number Of Operating Segment1</link:label>
    <link:label id="lab_gmab_NumberOfOperatingSegment1_documentation_en-US" xlink:label="lab_gmab_NumberOfOperatingSegment1" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Number Of Operating Segment1</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_NumberOfOperatingSegment1" xlink:href="gmab-20251231.xsd#gmab_NumberOfOperatingSegment1"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_NumberOfOperatingSegment1" xlink:to="lab_gmab_NumberOfOperatingSegment1" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfGeographicalAreasTable_547caa55-a212-42ec-b3fb-4477fb2de930_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfGeographicalAreasTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure of geographical areas [table]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfGeographicalAreasTable_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfGeographicalAreasTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of geographical areas [table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfGeographicalAreasTable" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfGeographicalAreasTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfGeographicalAreasTable" xlink:to="lab_ifrs-full_DisclosureOfGeographicalAreasTable" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AcquisitionsThroughBusinessCombinationsIntangibleAssetsAndGoodwill_8404cae7-35d8-41fe-bc79-798f016ef6e4_terseLabel_en-US" xlink:label="lab_ifrs-full_AcquisitionsThroughBusinessCombinationsIntangibleAssetsAndGoodwill" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Additions for the year</link:label>
    <link:label id="lab_ifrs-full_AcquisitionsThroughBusinessCombinationsIntangibleAssetsAndGoodwill_label_en-US" xlink:label="lab_ifrs-full_AcquisitionsThroughBusinessCombinationsIntangibleAssetsAndGoodwill" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Acquisitions through business combinations, intangible assets and goodwill</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AcquisitionsThroughBusinessCombinationsIntangibleAssetsAndGoodwill" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AcquisitionsThroughBusinessCombinationsIntangibleAssetsAndGoodwill"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AcquisitionsThroughBusinessCombinationsIntangibleAssetsAndGoodwill" xlink:to="lab_ifrs-full_AcquisitionsThroughBusinessCombinationsIntangibleAssetsAndGoodwill" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember_6f36b829-9922-4ea5-8fe1-f77a3a92ff79_terseLabel_en-US" xlink:label="lab_ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Financial assets measured at fair value through profit or loss</link:label>
    <link:label id="lab_ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember_label_en-US" xlink:label="lab_ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Financial assets at fair value through profit or loss, category [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember"/>
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    <link:label id="lab_gmab_StockRepurchaseThirdAuthorizationMember_1c1c5d7e-a576-4051-8d6a-98f8c135997e_terseLabel_en-US" xlink:label="lab_gmab_StockRepurchaseThirdAuthorizationMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Third authorization</link:label>
    <link:label id="lab_gmab_StockRepurchaseThirdAuthorizationMember_label_en-US" xlink:label="lab_gmab_StockRepurchaseThirdAuthorizationMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stock Repurchase Third Authorization [Member]</link:label>
    <link:label id="lab_gmab_StockRepurchaseThirdAuthorizationMember_documentation_en-US" xlink:label="lab_gmab_StockRepurchaseThirdAuthorizationMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the third authorization under the share repurchase arrangement by the board of directors.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_StockRepurchaseThirdAuthorizationMember" xlink:href="gmab-20251231.xsd#gmab_StockRepurchaseThirdAuthorizationMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_StockRepurchaseThirdAuthorizationMember" xlink:to="lab_gmab_StockRepurchaseThirdAuthorizationMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesIntangibleAssetsAndGoodwill_5605c65c-9c95-41f6-ad82-5a556d4f76f6_terseLabel_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesIntangibleAssetsAndGoodwill" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Effect of exchange rate adjustment</link:label>
    <link:label id="lab_ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesIntangibleAssetsAndGoodwill_label_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesIntangibleAssetsAndGoodwill" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (decrease) through net exchange differences, intangible assets and goodwill</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesIntangibleAssetsAndGoodwill" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesIntangibleAssetsAndGoodwill"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesIntangibleAssetsAndGoodwill" xlink:to="lab_ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesIntangibleAssetsAndGoodwill" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_StatementOfFinancialPositionAbstract_label_en-US" xlink:label="lab_ifrs-full_StatementOfFinancialPositionAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Statement of financial position [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_StatementOfFinancialPositionAbstract" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_StatementOfFinancialPositionAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_StatementOfFinancialPositionAbstract" xlink:to="lab_ifrs-full_StatementOfFinancialPositionAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_InterestExpenseOnOtherFinancialLiabilities_019c49b5-c377-7d61-a806-e9c3d2af82d4_negatedLabel_en-US" xlink:label="lab_ifrs-full_InterestExpenseOnOtherFinancialLiabilities" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Other interest expense</link:label>
    <link:label id="lab_ifrs-full_InterestExpenseOnOtherFinancialLiabilities_label_en-US" xlink:label="lab_ifrs-full_InterestExpenseOnOtherFinancialLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Interest expense on other financial liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InterestExpenseOnOtherFinancialLiabilities" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_InterestExpenseOnOtherFinancialLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_InterestExpenseOnOtherFinancialLiabilities" xlink:to="lab_ifrs-full_InterestExpenseOnOtherFinancialLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_CoverAbstract_label_en-US" xlink:label="lab_dei_CoverAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cover [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CoverAbstract" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CoverAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_CoverAbstract" xlink:to="lab_dei_CoverAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_USDPortfolioMember_f111cfb0-01c7-4b28-939b-bf8bc92bd36d_terseLabel_en-US" xlink:label="lab_gmab_USDPortfolioMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">USD portfolio</link:label>
    <link:label id="lab_gmab_USDPortfolioMember_label_en-US" xlink:label="lab_gmab_USDPortfolioMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">USD Portfolio [Member]</link:label>
    <link:label id="lab_gmab_USDPortfolioMember_documentation_en-US" xlink:label="lab_gmab_USDPortfolioMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This member stands for USD Portfolio.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_USDPortfolioMember" xlink:href="gmab-20251231.xsd#gmab_USDPortfolioMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_USDPortfolioMember" xlink:to="lab_gmab_USDPortfolioMember" xlink:type="arc" order="1"/>
    <link:label id="lab_srt_MaximumMember_31ad4e61-ea3e-420d-aa07-3eb2ecf30837_terseLabel_en-US" xlink:label="lab_srt_MaximumMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Maximum</link:label>
    <link:label id="lab_srt_MaximumMember_label_en-US" xlink:label="lab_srt_MaximumMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Maximum [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_MaximumMember" xlink:to="lab_srt_MaximumMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfReclassificationsOrChangesInPresentationExplanatory_019be4f2-3347-7dde-9333-0e3623579f63_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfReclassificationsOrChangesInPresentationExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure of reclassifications or changes in presentation</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfReclassificationsOrChangesInPresentationExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfReclassificationsOrChangesInPresentationExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of reclassifications or changes in presentation [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfReclassificationsOrChangesInPresentationExplanatory" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfReclassificationsOrChangesInPresentationExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfReclassificationsOrChangesInPresentationExplanatory" xlink:to="lab_ifrs-full_DisclosureOfReclassificationsOrChangesInPresentationExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_MaximumNumberOfProductConceptsForWhichCostPlusMarginApproachWasUtilized_5d968644-f523-4f3e-a6cc-3adfaa53a337_terseLabel_en-US" xlink:label="lab_gmab_MaximumNumberOfProductConceptsForWhichCostPlusMarginApproachWasUtilized" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Maximum number of product concepts for which cost-plus margin approach was utilized</link:label>
    <link:label id="lab_gmab_MaximumNumberOfProductConceptsForWhichCostPlusMarginApproachWasUtilized_label_en-US" xlink:label="lab_gmab_MaximumNumberOfProductConceptsForWhichCostPlusMarginApproachWasUtilized" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Maximum Number of Product Concepts for Which Cost Plus Margin Approach Was Utilized</link:label>
    <link:label id="lab_gmab_MaximumNumberOfProductConceptsForWhichCostPlusMarginApproachWasUtilized_documentation_en-US" xlink:label="lab_gmab_MaximumNumberOfProductConceptsForWhichCostPlusMarginApproachWasUtilized" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the maximum number of product concepts for which a cost-plus margin approach was utilized for co-development activities.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_MaximumNumberOfProductConceptsForWhichCostPlusMarginApproachWasUtilized" xlink:href="gmab-20251231.xsd#gmab_MaximumNumberOfProductConceptsForWhichCostPlusMarginApproachWasUtilized"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_MaximumNumberOfProductConceptsForWhichCostPlusMarginApproachWasUtilized" xlink:to="lab_gmab_MaximumNumberOfProductConceptsForWhichCostPlusMarginApproachWasUtilized" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_TransactionsWithOwnersLineItems_09ad537c-9793-4285-90eb-b26eb23a03a4_terseLabel_en-US" xlink:label="lab_gmab_TransactionsWithOwnersLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Transactions with owners:</link:label>
    <link:label id="lab_gmab_TransactionsWithOwnersLineItems_label_en-US" xlink:label="lab_gmab_TransactionsWithOwnersLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Transactions With Owners [Line Items]</link:label>
    <link:label id="lab_gmab_TransactionsWithOwnersLineItems_documentation_en-US" xlink:label="lab_gmab_TransactionsWithOwnersLineItems" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">n/a</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_TransactionsWithOwnersLineItems" xlink:href="gmab-20251231.xsd#gmab_TransactionsWithOwnersLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_TransactionsWithOwnersLineItems" xlink:to="lab_gmab_TransactionsWithOwnersLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis_f61384ae-cd66-4fcb-bffa-2de961d19134_terseLabel_en-US" xlink:label="lab_ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Classes of intangible assets other than goodwill [axis]</link:label>
    <link:label id="lab_ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis_label_en-US" xlink:label="lab_ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Classes of intangible assets other than goodwill [axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis" xlink:to="lab_ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_TradeReceivables_0a7362c9-5c5b-4d77-98e3-7926e2dce0ab_totalLabel_en-US" xlink:label="lab_ifrs-full_TradeReceivables" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total</link:label>
    <link:label id="lab_ifrs-full_TradeReceivables_label_en-US" xlink:label="lab_ifrs-full_TradeReceivables" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Trade receivables</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TradeReceivables" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TradeReceivables"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_TradeReceivables" xlink:to="lab_ifrs-full_TradeReceivables" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_TaxEffectOfAdjustmentToUnrecognizedDeferredTaxAssets_b0dff1ca-f081-46e1-be56-4def61c2b58b_terseLabel_en-US" xlink:label="lab_gmab_TaxEffectOfAdjustmentToUnrecognizedDeferredTaxAssets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net increase (decrease) of unrecognized deferred tax assets for the year</link:label>
    <link:label id="lab_gmab_TaxEffectOfAdjustmentToUnrecognizedDeferredTaxAssets_label_en-US" xlink:label="lab_gmab_TaxEffectOfAdjustmentToUnrecognizedDeferredTaxAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Tax Effect Of Adjustment To Unrecognized Deferred Tax Assets</link:label>
    <link:label id="lab_gmab_TaxEffectOfAdjustmentToUnrecognizedDeferredTaxAssets_documentation_en-US" xlink:label="lab_gmab_TaxEffectOfAdjustmentToUnrecognizedDeferredTaxAssets" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The amount of tax effect of adjustment to unrecognized deferred tax assets.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_TaxEffectOfAdjustmentToUnrecognizedDeferredTaxAssets" xlink:href="gmab-20251231.xsd#gmab_TaxEffectOfAdjustmentToUnrecognizedDeferredTaxAssets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_TaxEffectOfAdjustmentToUnrecognizedDeferredTaxAssets" xlink:to="lab_gmab_TaxEffectOfAdjustmentToUnrecognizedDeferredTaxAssets" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityShellCompany_019b45b4-3868-7b94-89ab-58abfc652b11_terseLabel_en-US" xlink:label="lab_dei_EntityShellCompany" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Shell Company</link:label>
    <link:label id="lab_dei_EntityShellCompany_label_en-US" xlink:label="lab_dei_EntityShellCompany" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Shell Company</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityShellCompany" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityShellCompany"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityShellCompany" xlink:to="lab_dei_EntityShellCompany" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_SharePremium_a465f75e-2665-4276-969c-c720a2e62220_terseLabel_en-US" xlink:label="lab_ifrs-full_SharePremium" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share premium</link:label>
    <link:label id="lab_ifrs-full_SharePremium_label_en-US" xlink:label="lab_ifrs-full_SharePremium" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share premium</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SharePremium" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SharePremium"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_SharePremium" xlink:to="lab_ifrs-full_SharePremium" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract_9f500fd8-d43b-4bfc-b6d0-2e2598d4b111_terseLabel_en-US" xlink:label="lab_ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash flows from financing activities:</link:label>
    <link:label id="lab_ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract_label_en-US" xlink:label="lab_ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash flows from (used in) financing activities [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract" xlink:to="lab_ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_PeriodTwoMember_019c5221-97cf-7c86-8f08-8e0afe037101_terseLabel_en-US" xlink:label="lab_gmab_PeriodTwoMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Period two</link:label>
    <link:label id="lab_gmab_PeriodTwoMember_label_en-US" xlink:label="lab_gmab_PeriodTwoMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Period Two [Member]</link:label>
    <link:label id="lab_gmab_PeriodTwoMember_documentation_en-US" xlink:label="lab_gmab_PeriodTwoMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Period Two</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_PeriodTwoMember" xlink:href="gmab-20251231.xsd#gmab_PeriodTwoMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_PeriodTwoMember" xlink:to="lab_gmab_PeriodTwoMember" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_OtherRoyaltyProductsMember_26fc49ab-4b24-48f3-b7c1-e79bb9bbfe90_terseLabel_en-US" xlink:label="lab_gmab_OtherRoyaltyProductsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other</link:label>
    <link:label id="lab_gmab_OtherRoyaltyProductsMember_label_en-US" xlink:label="lab_gmab_OtherRoyaltyProductsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Royalty Products [Member]</link:label>
    <link:label id="lab_gmab_OtherRoyaltyProductsMember_documentation_en-US" xlink:label="lab_gmab_OtherRoyaltyProductsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This member stands for other royalty product.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_OtherRoyaltyProductsMember" xlink:href="gmab-20251231.xsd#gmab_OtherRoyaltyProductsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_OtherRoyaltyProductsMember" xlink:to="lab_gmab_OtherRoyaltyProductsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_PercentageOfShareCapitalOnSaleOfTreasuryShares_019c5102-acba-7972-9a7e-4eac8322e90b_negatedTerseLabel_en-US" xlink:label="lab_gmab_PercentageOfShareCapitalOnSaleOfTreasuryShares" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Proportion of share capital on shares used for funding RSU program (in %)</link:label>
    <link:label id="lab_gmab_PercentageOfShareCapitalOnSaleOfTreasuryShares_label_en-US" xlink:label="lab_gmab_PercentageOfShareCapitalOnSaleOfTreasuryShares" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Percentage Of Share Capital On Sale Of Treasury Shares</link:label>
    <link:label id="lab_gmab_PercentageOfShareCapitalOnSaleOfTreasuryShares_documentation_en-US" xlink:label="lab_gmab_PercentageOfShareCapitalOnSaleOfTreasuryShares" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Percentage of proportion of share capital on shares used for funding RSU program.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_PercentageOfShareCapitalOnSaleOfTreasuryShares" xlink:href="gmab-20251231.xsd#gmab_PercentageOfShareCapitalOnSaleOfTreasuryShares"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_PercentageOfShareCapitalOnSaleOfTreasuryShares" xlink:to="lab_gmab_PercentageOfShareCapitalOnSaleOfTreasuryShares" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_OpeningBalanceBeforeAdjustmentCumulativeEffectAtDateOfInitialApplicationMember_bf1452fe-39d0-4d2e-ba36-3a4a03824ad7_terseLabel_en-US" xlink:label="lab_ifrs-full_OpeningBalanceBeforeAdjustmentCumulativeEffectAtDateOfInitialApplicationMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Opening balance before adjustment, cumulative effect at date of initial application [member]</link:label>
    <link:label id="lab_ifrs-full_OpeningBalanceBeforeAdjustmentCumulativeEffectAtDateOfInitialApplicationMember_label_en-US" xlink:label="lab_ifrs-full_OpeningBalanceBeforeAdjustmentCumulativeEffectAtDateOfInitialApplicationMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Opening balance before adjustment, cumulative effect at date of initial application [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OpeningBalanceBeforeAdjustmentCumulativeEffectAtDateOfInitialApplicationMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OpeningBalanceBeforeAdjustmentCumulativeEffectAtDateOfInitialApplicationMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OpeningBalanceBeforeAdjustmentCumulativeEffectAtDateOfInitialApplicationMember" xlink:to="lab_ifrs-full_OpeningBalanceBeforeAdjustmentCumulativeEffectAtDateOfInitialApplicationMember" xlink:type="arc" order="1"/>
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    <link:label id="lab_gmab_ShareCapitalExerciseOfWarrants_8ca6f8f1-9e6a-44f5-b962-1fc82ba0f73e_terseLabel_en-US" xlink:label="lab_gmab_ShareCapitalExerciseOfWarrants" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Exercise of warrants</link:label>
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    <link:label id="lab_gmab_CashFlowProjectionForecastPeriod_019be50e-9cce-7087-a5c7-7cfa2fd8ad71_terseLabel_en-US" xlink:label="lab_gmab_CashFlowProjectionForecastPeriod" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash flow projection, period (in years)</link:label>
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    <link:label id="lab_gmab_PercentageOfRevenue_documentation_en-US" xlink:label="lab_gmab_PercentageOfRevenue" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Percentage of revenue.</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_WorkInProgress" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_WorkInProgress"/>
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    <link:label id="lab_ifrs-full_DisclosureOfBasisOfPreparationOfFinancialStatementsExplanatory_f29b93c7-c669-471d-b7a2-91b4ef0ed066_verboseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfBasisOfPreparationOfFinancialStatementsExplanatory" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Basis of Presentation</link:label>
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    <link:label id="lab_gmab_MerusUSInc.Member_019b07a9-f5aa-74ec-b040-591f61b428bd_terseLabel_en-US" xlink:label="lab_gmab_MerusUSInc.Member" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Merus US Inc.</link:label>
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    <link:label id="lab_gmab_MerusUSInc.Member_documentation_en-US" xlink:label="lab_gmab_MerusUSInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Merus US Inc.</link:label>
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    <link:label id="lab_dei_DocumentFiscalPeriodFocus_f2c3d783-c907-4e5b-be4d-d8a5f8de1245_terseLabel_en-US" xlink:label="lab_dei_DocumentFiscalPeriodFocus" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Document Fiscal Period Focus</link:label>
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    <link:label id="lab_ifrs-full_Assets_ada64f2c-80f7-4462-92bc-592316df5a09_totalLabel_en-US" xlink:label="lab_ifrs-full_Assets" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total assets</link:label>
    <link:label id="lab_ifrs-full_Assets_54fb0718-12c0-4eda-b4c7-8ebbe2cf8fe4_terseLabel_en-US" xlink:label="lab_ifrs-full_Assets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total assets</link:label>
    <link:label id="lab_ifrs-full_Assets_label_en-US" xlink:label="lab_ifrs-full_Assets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Assets" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Assets"/>
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    <link:label id="lab_srt_LitigationCaseTypeDomain_019b2244-6522-7034-bf4f-033d7c5fa142_terseLabel_en-US" xlink:label="lab_srt_LitigationCaseTypeDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Litigation Case [Domain]</link:label>
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    <link:label id="lab_gmab_MijkeZachariasseMember_e7432824-cf23-45de-8f54-4d73a447502c_terseLabel_en-US" xlink:label="lab_gmab_MijkeZachariasseMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Mijke Zachariasse</link:label>
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    <link:label id="lab_gmab_MijkeZachariasseMember_documentation_en-US" xlink:label="lab_gmab_MijkeZachariasseMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents information pertaining to Mijke Zachariasse.</link:label>
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    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForIncomeTaxExplanatory_019bbbe6-669d-7cf2-8fc9-c60ce9f27ea5_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForIncomeTaxExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Corporate Tax</link:label>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForIncomeTaxExplanatory_label_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForIncomeTaxExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Description of accounting policy for income tax [text block]</link:label>
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    <link:label id="lab_srt_ParentCompanyMember_ef9c4dec-7389-42ca-a159-c3f267f3e877_terseLabel_en-US" xlink:label="lab_srt_ParentCompanyMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Parent Company</link:label>
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    <link:label id="lab_ifrs-full_NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement_5801d43e-13be-4088-961d-10de02aa808f_periodStartLabel_en-US" xlink:label="lab_ifrs-full_NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Outstanding at beginning of period (in shares)</link:label>
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    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForBusinessCombinationsExplanatory_019bbc7e-7471-7258-8b05-21c19c755a31_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForBusinessCombinationsExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Business Combinations</link:label>
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    <link:label id="lab_ifrs-full_CurrentTaxExpenseIncomeAndAdjustmentsForCurrentTaxOfPriorPeriods_72776432-3fd4-4cb1-8735-de113634dd18_totalLabel_en-US" xlink:label="lab_ifrs-full_CurrentTaxExpenseIncomeAndAdjustmentsForCurrentTaxOfPriorPeriods" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total tax effect</link:label>
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    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForGoodwillExplanatory_019bbbf3-b17b-797b-abaf-4c874c13fdb4_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForGoodwillExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Goodwill</link:label>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForGoodwillExplanatory_label_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForGoodwillExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Description of accounting policy for goodwill [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForGoodwillExplanatory" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DescriptionOfAccountingPolicyForGoodwillExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DescriptionOfAccountingPolicyForGoodwillExplanatory" xlink:to="lab_ifrs-full_DescriptionOfAccountingPolicyForGoodwillExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CreditRiskMember_159ea433-1a59-4835-a178-91d72625fd16_terseLabel_en-US" xlink:label="lab_ifrs-full_CreditRiskMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Credit risk</link:label>
    <link:label id="lab_ifrs-full_CreditRiskMember_label_en-US" xlink:label="lab_ifrs-full_CreditRiskMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Credit risk [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CreditRiskMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CreditRiskMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CreditRiskMember" xlink:to="lab_ifrs-full_CreditRiskMember" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_StaffCostAbstract_6c9fcbbd-af47-457d-b386-e02ee6f259d6_terseLabel_en-US" xlink:label="lab_gmab_StaffCostAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Staff Costs</link:label>
    <link:label id="lab_gmab_StaffCostAbstract_label_en-US" xlink:label="lab_gmab_StaffCostAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Staff Cost [Abstract]</link:label>
    <link:label id="lab_gmab_StaffCostAbstract_documentation_en-US" xlink:label="lab_gmab_StaffCostAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">No definition available.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_StaffCostAbstract" xlink:href="gmab-20251231.xsd#gmab_StaffCostAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_StaffCostAbstract" xlink:to="lab_gmab_StaffCostAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_TradingSymbol_019b0cef-7978-71a4-a713-9ea2d7dda0cb_terseLabel_en-US" xlink:label="lab_dei_TradingSymbol" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Trading Symbol</link:label>
    <link:label id="lab_dei_TradingSymbol_label_en-US" xlink:label="lab_dei_TradingSymbol" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Trading Symbol</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_TradingSymbol"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_TradingSymbol" xlink:to="lab_dei_TradingSymbol" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_WeightedAverageExpectedLifeWarrantsGranted_28d04232-9f15-4c66-9abf-01284358183f_terseLabel_en-US" xlink:label="lab_gmab_WeightedAverageExpectedLifeWarrantsGranted" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Expected life of warrants (in years)</link:label>
    <link:label id="lab_gmab_WeightedAverageExpectedLifeWarrantsGranted_label_en-US" xlink:label="lab_gmab_WeightedAverageExpectedLifeWarrantsGranted" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Weighted Average, Expected Life, Warrants Granted</link:label>
    <link:label id="lab_gmab_WeightedAverageExpectedLifeWarrantsGranted_documentation_en-US" xlink:label="lab_gmab_WeightedAverageExpectedLifeWarrantsGranted" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The expected life of share options granted.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_WeightedAverageExpectedLifeWarrantsGranted" xlink:href="gmab-20251231.xsd#gmab_WeightedAverageExpectedLifeWarrantsGranted"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_WeightedAverageExpectedLifeWarrantsGranted" xlink:to="lab_gmab_WeightedAverageExpectedLifeWarrantsGranted" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_WeightedAverageExercisePriceOfWarrantsExercisableInMoney_553dbc20-a09a-4037-8376-f33ebc379375_terseLabel_en-US" xlink:label="lab_gmab_WeightedAverageExercisePriceOfWarrantsExercisableInMoney" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Weighted average exercise price of warrants exercisable in money (in DKK per share)</link:label>
    <link:label id="lab_gmab_WeightedAverageExercisePriceOfWarrantsExercisableInMoney_label_en-US" xlink:label="lab_gmab_WeightedAverageExercisePriceOfWarrantsExercisableInMoney" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Weighted Average Exercise Price Of Warrants Exercisable In Money</link:label>
    <link:label id="lab_gmab_WeightedAverageExercisePriceOfWarrantsExercisableInMoney_documentation_en-US" xlink:label="lab_gmab_WeightedAverageExercisePriceOfWarrantsExercisableInMoney" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Exercise price per share or per unit of warrants exercisable in money during the period.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_WeightedAverageExercisePriceOfWarrantsExercisableInMoney" xlink:href="gmab-20251231.xsd#gmab_WeightedAverageExercisePriceOfWarrantsExercisableInMoney"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_WeightedAverageExercisePriceOfWarrantsExercisableInMoney" xlink:to="lab_gmab_WeightedAverageExercisePriceOfWarrantsExercisableInMoney" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_IncreaseDecreaseInCurrentOtherPayables_019c4ec5-bf4d-7a41-86e4-000c7c025024_terseLabel_en-US" xlink:label="lab_gmab_IncreaseDecreaseInCurrentOtherPayables" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Increase (decrease) in current other payables</link:label>
    <link:label id="lab_gmab_IncreaseDecreaseInCurrentOtherPayables_label_en-US" xlink:label="lab_gmab_IncreaseDecreaseInCurrentOtherPayables" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) In Current Other Payables</link:label>
    <link:label id="lab_gmab_IncreaseDecreaseInCurrentOtherPayables_documentation_en-US" xlink:label="lab_gmab_IncreaseDecreaseInCurrentOtherPayables" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Increase (Decrease) In Current Other Payables</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_IncreaseDecreaseInCurrentOtherPayables" xlink:href="gmab-20251231.xsd#gmab_IncreaseDecreaseInCurrentOtherPayables"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_IncreaseDecreaseInCurrentOtherPayables" xlink:to="lab_gmab_IncreaseDecreaseInCurrentOtherPayables" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_Revenue_18663cef-0519-4554-8fef-8c6b028579b3_terseLabel_en-US" xlink:label="lab_ifrs-full_Revenue" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Revenue</link:label>
    <link:label id="lab_ifrs-full_Revenue_4d01eebe-8e3b-49ef-aac6-152bc0ab3929_verboseLabel_en-US" xlink:label="lab_ifrs-full_Revenue" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Upfront payment recognized</link:label>
    <link:label id="lab_ifrs-full_Revenue_label_en-US" xlink:label="lab_ifrs-full_Revenue" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Revenue</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Revenue" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Revenue"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_Revenue" xlink:to="lab_ifrs-full_Revenue" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityAddressCityOrTown_019b0cd0-2dc8-72cf-847e-fb1b7fc3dc29_terseLabel_en-US" xlink:label="lab_dei_EntityAddressCityOrTown" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Address, City or Town</link:label>
    <link:label id="lab_dei_EntityAddressCityOrTown_label_en-US" xlink:label="lab_dei_EntityAddressCityOrTown" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Address, City or Town</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressCityOrTown"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityAddressCityOrTown" xlink:to="lab_dei_EntityAddressCityOrTown" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_BirgitteStephensenMember_b54df05e-03d5-45b4-a3e6-9e0dc73d1dd9_terseLabel_en-US" xlink:label="lab_gmab_BirgitteStephensenMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Birgitte Stephensen</link:label>
    <link:label id="lab_gmab_BirgitteStephensenMember_label_en-US" xlink:label="lab_gmab_BirgitteStephensenMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Birgitte Stephensen [Member]</link:label>
    <link:label id="lab_gmab_BirgitteStephensenMember_documentation_en-US" xlink:label="lab_gmab_BirgitteStephensenMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents information pertaining to Birgitte Stephensen.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_BirgitteStephensenMember" xlink:href="gmab-20251231.xsd#gmab_BirgitteStephensenMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_BirgitteStephensenMember" xlink:to="lab_gmab_BirgitteStephensenMember" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_FinancialExpensesLineItems_3a5b155b-9bc8-45af-956a-448ff8dbdef4_terseLabel_en-US" xlink:label="lab_gmab_FinancialExpensesLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Financial expenses:</link:label>
    <link:label id="lab_gmab_FinancialExpensesLineItems_label_en-US" xlink:label="lab_gmab_FinancialExpensesLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Financial expenses: [Line Items]</link:label>
    <link:label id="lab_gmab_FinancialExpensesLineItems_documentation_en-US" xlink:label="lab_gmab_FinancialExpensesLineItems" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">na</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_FinancialExpensesLineItems" xlink:href="gmab-20251231.xsd#gmab_FinancialExpensesLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_FinancialExpensesLineItems" xlink:to="lab_gmab_FinancialExpensesLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_IssuedCapitalMember_550d4a0e-e71a-41ff-bc98-57c9f460aed5_terseLabel_en-US" xlink:label="lab_ifrs-full_IssuedCapitalMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share capital</link:label>
    <link:label id="lab_ifrs-full_IssuedCapitalMember_label_en-US" xlink:label="lab_ifrs-full_IssuedCapitalMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Issued capital [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IssuedCapitalMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IssuedCapitalMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_IssuedCapitalMember" xlink:to="lab_ifrs-full_IssuedCapitalMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CumulativeEffectAtDateOfInitialApplicationAxis_12721cef-79ef-4659-b6ff-3498a96f177f_terseLabel_en-US" xlink:label="lab_ifrs-full_CumulativeEffectAtDateOfInitialApplicationAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cumulative effect at date of initial application [axis]</link:label>
    <link:label id="lab_ifrs-full_CumulativeEffectAtDateOfInitialApplicationAxis_label_en-US" xlink:label="lab_ifrs-full_CumulativeEffectAtDateOfInitialApplicationAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cumulative effect at date of initial application [axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CumulativeEffectAtDateOfInitialApplicationAxis" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CumulativeEffectAtDateOfInitialApplicationAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CumulativeEffectAtDateOfInitialApplicationAxis" xlink:to="lab_ifrs-full_CumulativeEffectAtDateOfInitialApplicationAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_CollaborationsAgreementRoyaltiesExpirationTermAfterFirstSaleOfEachLicensedProduct_2a7bb1df-884d-4ada-93c8-01ce097bc69b_terseLabel_en-US" xlink:label="lab_gmab_CollaborationsAgreementRoyaltiesExpirationTermAfterFirstSaleOfEachLicensedProduct" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Royalties expiration term after the first sale of each licensed product</link:label>
    <link:label id="lab_gmab_CollaborationsAgreementRoyaltiesExpirationTermAfterFirstSaleOfEachLicensedProduct_label_en-US" xlink:label="lab_gmab_CollaborationsAgreementRoyaltiesExpirationTermAfterFirstSaleOfEachLicensedProduct" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Collaborations Agreement, Royalties Expiration Term After First Sale of Each Licensed Product</link:label>
    <link:label id="lab_gmab_CollaborationsAgreementRoyaltiesExpirationTermAfterFirstSaleOfEachLicensedProduct_documentation_en-US" xlink:label="lab_gmab_CollaborationsAgreementRoyaltiesExpirationTermAfterFirstSaleOfEachLicensedProduct" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the royalties expiration term after the first sale of each licensed product in such country.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_CollaborationsAgreementRoyaltiesExpirationTermAfterFirstSaleOfEachLicensedProduct" xlink:href="gmab-20251231.xsd#gmab_CollaborationsAgreementRoyaltiesExpirationTermAfterFirstSaleOfEachLicensedProduct"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_CollaborationsAgreementRoyaltiesExpirationTermAfterFirstSaleOfEachLicensedProduct" xlink:to="lab_gmab_CollaborationsAgreementRoyaltiesExpirationTermAfterFirstSaleOfEachLicensedProduct" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_CashTransferredForOutstandingShares_a0d921b2-80ad-492f-9944-2fefbcd89003_terseLabel_en-US" xlink:label="lab_gmab_CashTransferredForOutstandingShares" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash paid for outstanding shares</link:label>
    <link:label id="lab_gmab_CashTransferredForOutstandingShares_label_en-US" xlink:label="lab_gmab_CashTransferredForOutstandingShares" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash Transferred For Outstanding Shares</link:label>
    <link:label id="lab_gmab_CashTransferredForOutstandingShares_documentation_en-US" xlink:label="lab_gmab_CashTransferredForOutstandingShares" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The fair value, at acquisition date, of cash transferred for outstanding shares as consideration in a business combination.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_CashTransferredForOutstandingShares" xlink:href="gmab-20251231.xsd#gmab_CashTransferredForOutstandingShares"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_CashTransferredForOutstandingShares" xlink:to="lab_gmab_CashTransferredForOutstandingShares" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_PerformanceObligationsDomain_0caa8d1c-2e6c-449b-9e8f-cb696784af1f_terseLabel_en-US" xlink:label="lab_ifrs-full_PerformanceObligationsDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Performance obligations [domain]</link:label>
    <link:label id="lab_ifrs-full_PerformanceObligationsDomain_label_en-US" xlink:label="lab_ifrs-full_PerformanceObligationsDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Performance obligations [domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PerformanceObligationsDomain" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PerformanceObligationsDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_PerformanceObligationsDomain" xlink:to="lab_ifrs-full_PerformanceObligationsDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_ChugaiPatentInfringementComplaintMember_019b2244-6522-75c6-bacc-2d57a79d0bfa_terseLabel_en-US" xlink:label="lab_gmab_ChugaiPatentInfringementComplaintMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Chugai Patent Infringement Complaint</link:label>
    <link:label id="lab_gmab_ChugaiPatentInfringementComplaintMember_label_en-US" xlink:label="lab_gmab_ChugaiPatentInfringementComplaintMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Chugai Patent Infringement Complaint [Member]</link:label>
    <link:label id="lab_gmab_ChugaiPatentInfringementComplaintMember_documentation_en-US" xlink:label="lab_gmab_ChugaiPatentInfringementComplaintMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Chugai Patent Infringement Complaint</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_ChugaiPatentInfringementComplaintMember" xlink:href="gmab-20251231.xsd#gmab_ChugaiPatentInfringementComplaintMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_ChugaiPatentInfringementComplaintMember" xlink:to="lab_gmab_ChugaiPatentInfringementComplaintMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfInformationAboutKeyManagementPersonnelExplanatory_5f6b37b6-4261-492e-b7e0-d33a6a9cd8a3_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfInformationAboutKeyManagementPersonnelExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of executive compensation</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfInformationAboutKeyManagementPersonnelExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfInformationAboutKeyManagementPersonnelExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of information about key management personnel [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfInformationAboutKeyManagementPersonnelExplanatory" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfInformationAboutKeyManagementPersonnelExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfInformationAboutKeyManagementPersonnelExplanatory" xlink:to="lab_ifrs-full_DisclosureOfInformationAboutKeyManagementPersonnelExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_SellingGeneralAndAdministrativeExpenseMember_019be51c-4e7d-79fe-8d8b-b95698d56b8d_terseLabel_en-US" xlink:label="lab_ifrs-full_SellingGeneralAndAdministrativeExpenseMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Selling, general and administrative expenses</link:label>
    <link:label id="lab_ifrs-full_SellingGeneralAndAdministrativeExpenseMember_label_en-US" xlink:label="lab_ifrs-full_SellingGeneralAndAdministrativeExpenseMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Selling, general and administrative expense [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SellingGeneralAndAdministrativeExpenseMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SellingGeneralAndAdministrativeExpenseMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_SellingGeneralAndAdministrativeExpenseMember" xlink:to="lab_ifrs-full_SellingGeneralAndAdministrativeExpenseMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityEmergingGrowthCompany_019b45af-fb1b-7760-ba8d-3ac173644ca1_terseLabel_en-US" xlink:label="lab_dei_EntityEmergingGrowthCompany" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Emerging Growth Company</link:label>
    <link:label id="lab_dei_EntityEmergingGrowthCompany_label_en-US" xlink:label="lab_dei_EntityEmergingGrowthCompany" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Emerging Growth Company</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityEmergingGrowthCompany" xlink:to="lab_dei_EntityEmergingGrowthCompany" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_ProfoundbioUsCoMember_a4aa29ba-025e-49c7-90a9-29715af1f2a6_terseLabel_en-US" xlink:label="lab_gmab_ProfoundbioUsCoMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">ProfoundBio US Co.</link:label>
    <link:label id="lab_gmab_ProfoundbioUsCoMember_label_en-US" xlink:label="lab_gmab_ProfoundbioUsCoMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Profoundbio Us Co [Member]</link:label>
    <link:label id="lab_gmab_ProfoundbioUsCoMember_documentation_en-US" xlink:label="lab_gmab_ProfoundbioUsCoMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This member stands for ProfoundBio, US Co.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_ProfoundbioUsCoMember" xlink:href="gmab-20251231.xsd#gmab_ProfoundbioUsCoMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_ProfoundbioUsCoMember" xlink:to="lab_gmab_ProfoundbioUsCoMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_PurchaseOfOtherLongtermAssetsClassifiedAsInvestingActivities_019c47da-5135-7b03-9882-5059fa2cfba0_negatedTerseLabel_en-US" xlink:label="lab_ifrs-full_PurchaseOfOtherLongtermAssetsClassifiedAsInvestingActivities" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Acquisition of assets, net of cash acquired</link:label>
    <link:label id="lab_ifrs-full_PurchaseOfOtherLongtermAssetsClassifiedAsInvestingActivities_label_en-US" xlink:label="lab_ifrs-full_PurchaseOfOtherLongtermAssetsClassifiedAsInvestingActivities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Purchase of other long-term assets, classified as investing activities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PurchaseOfOtherLongtermAssetsClassifiedAsInvestingActivities" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PurchaseOfOtherLongtermAssetsClassifiedAsInvestingActivities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_PurchaseOfOtherLongtermAssetsClassifiedAsInvestingActivities" xlink:to="lab_ifrs-full_PurchaseOfOtherLongtermAssetsClassifiedAsInvestingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForTradeAndOtherPayablesExplanatory_019bbc28-fc37-7952-a605-2bed40d81f4c_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForTradeAndOtherPayablesExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other Payables</link:label>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForTradeAndOtherPayablesExplanatory_label_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForTradeAndOtherPayablesExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Description of accounting policy for trade and other payables [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForTradeAndOtherPayablesExplanatory" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DescriptionOfAccountingPolicyForTradeAndOtherPayablesExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DescriptionOfAccountingPolicyForTradeAndOtherPayablesExplanatory" xlink:to="lab_ifrs-full_DescriptionOfAccountingPolicyForTradeAndOtherPayablesExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_KingdomOfDenmarkBondsAndTreasuryBillsMember_78e1da22-02a9-4853-89bc-260f95ff0e9e_terseLabel_en-US" xlink:label="lab_gmab_KingdomOfDenmarkBondsAndTreasuryBillsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Kingdom of Denmark bonds and treasury bills</link:label>
    <link:label id="lab_gmab_KingdomOfDenmarkBondsAndTreasuryBillsMember_label_en-US" xlink:label="lab_gmab_KingdomOfDenmarkBondsAndTreasuryBillsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Kingdom Of Denmark Bonds And Treasury Bills [Member]</link:label>
    <link:label id="lab_gmab_KingdomOfDenmarkBondsAndTreasuryBillsMember_documentation_en-US" xlink:label="lab_gmab_KingdomOfDenmarkBondsAndTreasuryBillsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This member stands for Kingdom of Denmark bonds and treasury bills.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_KingdomOfDenmarkBondsAndTreasuryBillsMember" xlink:href="gmab-20251231.xsd#gmab_KingdomOfDenmarkBondsAndTreasuryBillsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_KingdomOfDenmarkBondsAndTreasuryBillsMember" xlink:to="lab_gmab_KingdomOfDenmarkBondsAndTreasuryBillsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_IncreaseDecreaseThroughTransfersPropertyPlantAndEquipment_6607d126-ba7f-4af6-b29f-94c3f0ef7ffb_terseLabel_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseThroughTransfersPropertyPlantAndEquipment" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Transfers between the classes</link:label>
    <link:label id="lab_ifrs-full_IncreaseDecreaseThroughTransfersPropertyPlantAndEquipment_label_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseThroughTransfersPropertyPlantAndEquipment" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (decrease) through transfers, property, plant and equipment</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughTransfersPropertyPlantAndEquipment" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseThroughTransfersPropertyPlantAndEquipment"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_IncreaseDecreaseThroughTransfersPropertyPlantAndEquipment" xlink:to="lab_ifrs-full_IncreaseDecreaseThroughTransfersPropertyPlantAndEquipment" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_NumberOfWarrantsReissued_d335564c-6f94-46a5-b302-092522d68160_terseLabel_en-US" xlink:label="lab_gmab_NumberOfWarrantsReissued" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Warrants reissued (in shares)</link:label>
    <link:label id="lab_gmab_NumberOfWarrantsReissued_label_en-US" xlink:label="lab_gmab_NumberOfWarrantsReissued" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number Of Warrants Reissued</link:label>
    <link:label id="lab_gmab_NumberOfWarrantsReissued_documentation_en-US" xlink:label="lab_gmab_NumberOfWarrantsReissued" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Number of warrants reissued.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_NumberOfWarrantsReissued" xlink:href="gmab-20251231.xsd#gmab_NumberOfWarrantsReissued"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_NumberOfWarrantsReissued" xlink:to="lab_gmab_NumberOfWarrantsReissued" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_OtherMarketableSecuritiesMember_8b37eb9b-9e8e-4646-ad95-0f200ea6d636_terseLabel_en-US" xlink:label="lab_gmab_OtherMarketableSecuritiesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other</link:label>
    <link:label id="lab_gmab_OtherMarketableSecuritiesMember_label_en-US" xlink:label="lab_gmab_OtherMarketableSecuritiesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Marketable Securities [Member]</link:label>
    <link:label id="lab_gmab_OtherMarketableSecuritiesMember_documentation_en-US" xlink:label="lab_gmab_OtherMarketableSecuritiesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This member stands for other marketable securities.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_OtherMarketableSecuritiesMember" xlink:href="gmab-20251231.xsd#gmab_OtherMarketableSecuritiesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_OtherMarketableSecuritiesMember" xlink:to="lab_gmab_OtherMarketableSecuritiesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_StockRepurchaseFirstAuthorizationMember_465ca64e-777f-4f3d-b861-736a679c9ff4_terseLabel_en-US" xlink:label="lab_gmab_StockRepurchaseFirstAuthorizationMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">First authorization</link:label>
    <link:label id="lab_gmab_StockRepurchaseFirstAuthorizationMember_label_en-US" xlink:label="lab_gmab_StockRepurchaseFirstAuthorizationMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stock Repurchase First Authorization [Member]</link:label>
    <link:label id="lab_gmab_StockRepurchaseFirstAuthorizationMember_documentation_en-US" xlink:label="lab_gmab_StockRepurchaseFirstAuthorizationMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the first authorization under the share repurchase arrangement by the board of directors.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_StockRepurchaseFirstAuthorizationMember" xlink:href="gmab-20251231.xsd#gmab_StockRepurchaseFirstAuthorizationMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_StockRepurchaseFirstAuthorizationMember" xlink:to="lab_gmab_StockRepurchaseFirstAuthorizationMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisposalsPropertyPlantAndEquipment_f88952e8-2052-42dc-b7a1-11a4ceffb54e_negatedLabel_en-US" xlink:label="lab_ifrs-full_DisposalsPropertyPlantAndEquipment" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Disposals for the year</link:label>
    <link:label id="lab_ifrs-full_DisposalsPropertyPlantAndEquipment_label_en-US" xlink:label="lab_ifrs-full_DisposalsPropertyPlantAndEquipment" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disposals, property, plant and equipment</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisposalsPropertyPlantAndEquipment" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisposalsPropertyPlantAndEquipment"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisposalsPropertyPlantAndEquipment" xlink:to="lab_ifrs-full_DisposalsPropertyPlantAndEquipment" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_TaxExpenseIncomeAtApplicableTaxRate_c52a6097-5bc6-4111-b194-de39b5e8a0da_verboseLabel_en-US" xlink:label="lab_ifrs-full_TaxExpenseIncomeAtApplicableTaxRate" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Tax at the Danish corporation tax rate of 22% for all periods</link:label>
    <link:label id="lab_ifrs-full_TaxExpenseIncomeAtApplicableTaxRate_label_en-US" xlink:label="lab_ifrs-full_TaxExpenseIncomeAtApplicableTaxRate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Tax expense (income) at applicable tax rate</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TaxExpenseIncomeAtApplicableTaxRate" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TaxExpenseIncomeAtApplicableTaxRate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_TaxExpenseIncomeAtApplicableTaxRate" xlink:to="lab_ifrs-full_TaxExpenseIncomeAtApplicableTaxRate" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_BoardOfDirectorsMember_f8bc9567-6a90-4f6c-8309-c38a8a52b23d_terseLabel_en-US" xlink:label="lab_gmab_BoardOfDirectorsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Board of Directors</link:label>
    <link:label id="lab_gmab_BoardOfDirectorsMember_019bb400-13bd-7560-b8aa-6c9125934fac_verboseLabel_en-US" xlink:label="lab_gmab_BoardOfDirectorsMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Total</link:label>
    <link:label id="lab_gmab_BoardOfDirectorsMember_label_en-US" xlink:label="lab_gmab_BoardOfDirectorsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Board of Directors [Member]</link:label>
    <link:label id="lab_gmab_BoardOfDirectorsMember_documentation_en-US" xlink:label="lab_gmab_BoardOfDirectorsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents information pertaining to board of directors.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_BoardOfDirectorsMember" xlink:href="gmab-20251231.xsd#gmab_BoardOfDirectorsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_BoardOfDirectorsMember" xlink:to="lab_gmab_BoardOfDirectorsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ExercisePriceOfOutstandingShareOptions2019_974b05ad-8dab-441f-964a-eb0ce2a3d025_terseLabel_en-US" xlink:label="lab_ifrs-full_ExercisePriceOfOutstandingShareOptions2019" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Exercise price of outstanding share options (in DKK per share)</link:label>
    <link:label id="lab_ifrs-full_ExercisePriceOfOutstandingShareOptions2019_label_en-US" xlink:label="lab_ifrs-full_ExercisePriceOfOutstandingShareOptions2019" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Exercise price of outstanding share options</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ExercisePriceOfOutstandingShareOptions2019" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ExercisePriceOfOutstandingShareOptions2019"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ExercisePriceOfOutstandingShareOptions2019" xlink:to="lab_ifrs-full_ExercisePriceOfOutstandingShareOptions2019" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ConstructionInProgressMember_1f0e4231-2497-4e8e-a9bc-8192c832de0e_terseLabel_en-US" xlink:label="lab_ifrs-full_ConstructionInProgressMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Assets under construction</link:label>
    <link:label id="lab_ifrs-full_ConstructionInProgressMember_label_en-US" xlink:label="lab_ifrs-full_ConstructionInProgressMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Construction in progress [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ConstructionInProgressMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ConstructionInProgressMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ConstructionInProgressMember" xlink:to="lab_ifrs-full_ConstructionInProgressMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_TechnologybasedIntangibleAssetsMember_1ebca175-65fd-4305-886d-dc9a2b17e53b_terseLabel_en-US" xlink:label="lab_ifrs-full_TechnologybasedIntangibleAssetsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Technology platform intangible asset</link:label>
    <link:label id="lab_ifrs-full_TechnologybasedIntangibleAssetsMember_63fa5a6d-775a-443c-ad70-901f675f7b4f_verboseLabel_en-US" xlink:label="lab_ifrs-full_TechnologybasedIntangibleAssetsMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Technology Platform</link:label>
    <link:label id="lab_ifrs-full_TechnologybasedIntangibleAssetsMember_label_en-US" xlink:label="lab_ifrs-full_TechnologybasedIntangibleAssetsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Technology-based intangible assets [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TechnologybasedIntangibleAssetsMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TechnologybasedIntangibleAssetsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_TechnologybasedIntangibleAssetsMember" xlink:to="lab_ifrs-full_TechnologybasedIntangibleAssetsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AssetsAbstract_17e2b947-2029-48f9-8248-03a579f5e619_terseLabel_en-US" xlink:label="lab_ifrs-full_AssetsAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">ASSETS</link:label>
    <link:label id="lab_ifrs-full_AssetsAbstract_label_en-US" xlink:label="lab_ifrs-full_AssetsAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Assets [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AssetsAbstract" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AssetsAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AssetsAbstract" xlink:to="lab_ifrs-full_AssetsAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_ReceivablesExcludingPrepaymentsMember_9ce546ab-bc4c-45b2-b6e2-8335005eab01_terseLabel_en-US" xlink:label="lab_gmab_ReceivablesExcludingPrepaymentsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Receivables excluding prepayments</link:label>
    <link:label id="lab_gmab_ReceivablesExcludingPrepaymentsMember_label_en-US" xlink:label="lab_gmab_ReceivablesExcludingPrepaymentsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Receivables Excluding Prepayments [Member]</link:label>
    <link:label id="lab_gmab_ReceivablesExcludingPrepaymentsMember_documentation_en-US" xlink:label="lab_gmab_ReceivablesExcludingPrepaymentsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This member stands for Receivables Excluding Prepayments.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_ReceivablesExcludingPrepaymentsMember" xlink:href="gmab-20251231.xsd#gmab_ReceivablesExcludingPrepaymentsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_ReceivablesExcludingPrepaymentsMember" xlink:to="lab_gmab_ReceivablesExcludingPrepaymentsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_GainsLossesRecognisedInProfitOrLossExcludingExchangeDifferencesFairValueMeasurementAssets_8f285acc-3003-49f6-b4fb-6b5f83cf27e9_terseLabel_en-US" xlink:label="lab_ifrs-full_GainsLossesRecognisedInProfitOrLossExcludingExchangeDifferencesFairValueMeasurementAssets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair value changes</link:label>
    <link:label id="lab_ifrs-full_GainsLossesRecognisedInProfitOrLossExcludingExchangeDifferencesFairValueMeasurementAssets_label_en-US" xlink:label="lab_ifrs-full_GainsLossesRecognisedInProfitOrLossExcludingExchangeDifferencesFairValueMeasurementAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Gains (losses) recognised in profit or loss excluding exchange differences, fair value measurement, assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GainsLossesRecognisedInProfitOrLossExcludingExchangeDifferencesFairValueMeasurementAssets" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GainsLossesRecognisedInProfitOrLossExcludingExchangeDifferencesFairValueMeasurementAssets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_GainsLossesRecognisedInProfitOrLossExcludingExchangeDifferencesFairValueMeasurementAssets" xlink:to="lab_ifrs-full_GainsLossesRecognisedInProfitOrLossExcludingExchangeDifferencesFairValueMeasurementAssets" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_PercentageOfIncreaseDecreaseInInterestIncome_42dcd505-7990-46e4-bb3b-861330adb8b3_terseLabel_en-US" xlink:label="lab_gmab_PercentageOfIncreaseDecreaseInInterestIncome" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Increase (decrease) in interest income (in percentage)</link:label>
    <link:label id="lab_gmab_PercentageOfIncreaseDecreaseInInterestIncome_label_en-US" xlink:label="lab_gmab_PercentageOfIncreaseDecreaseInInterestIncome" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Percentage of Increase (Decrease) in Interest Income</link:label>
    <link:label id="lab_gmab_PercentageOfIncreaseDecreaseInInterestIncome_documentation_en-US" xlink:label="lab_gmab_PercentageOfIncreaseDecreaseInInterestIncome" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Percentage of increase in interest income.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_PercentageOfIncreaseDecreaseInInterestIncome" xlink:href="gmab-20251231.xsd#gmab_PercentageOfIncreaseDecreaseInInterestIncome"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_PercentageOfIncreaseDecreaseInInterestIncome" xlink:to="lab_gmab_PercentageOfIncreaseDecreaseInInterestIncome" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_TreasuryStockSharesOutstanding_1bcb31e8-1815-4b65-907e-9b821769faf9_terseLabel_en-US" xlink:label="lab_gmab_TreasuryStockSharesOutstanding" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Treasury stock, shares outstanding (in shares)</link:label>
    <link:label id="lab_gmab_TreasuryStockSharesOutstanding_label_en-US" xlink:label="lab_gmab_TreasuryStockSharesOutstanding" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Treasury Stock, Shares Outstanding</link:label>
    <link:label id="lab_gmab_TreasuryStockSharesOutstanding_documentation_en-US" xlink:label="lab_gmab_TreasuryStockSharesOutstanding" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Number of shares of treasury stock outstanding.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_TreasuryStockSharesOutstanding" xlink:href="gmab-20251231.xsd#gmab_TreasuryStockSharesOutstanding"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_TreasuryStockSharesOutstanding" xlink:to="lab_gmab_TreasuryStockSharesOutstanding" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ExternalCreditGradesAxis_30cd83ee-81f3-4c8f-81ef-13d854de447b_terseLabel_en-US" xlink:label="lab_ifrs-full_ExternalCreditGradesAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">External credit grades [axis]</link:label>
    <link:label id="lab_ifrs-full_ExternalCreditGradesAxis_label_en-US" xlink:label="lab_ifrs-full_ExternalCreditGradesAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">External credit grades [axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ExternalCreditGradesAxis" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ExternalCreditGradesAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ExternalCreditGradesAxis" xlink:to="lab_ifrs-full_ExternalCreditGradesAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_ScheduleOfPortfolioOfMarketableSecuritiesTableTextBlock_ee155c84-668f-4aee-a4bd-c50393b9304f_terseLabel_en-US" xlink:label="lab_gmab_ScheduleOfPortfolioOfMarketableSecuritiesTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of portfolio of marketable securities</link:label>
    <link:label id="lab_gmab_ScheduleOfPortfolioOfMarketableSecuritiesTableTextBlock_label_en-US" xlink:label="lab_gmab_ScheduleOfPortfolioOfMarketableSecuritiesTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule Of Portfolio Of Marketable Securities [Table Text Block]</link:label>
    <link:label id="lab_gmab_ScheduleOfPortfolioOfMarketableSecuritiesTableTextBlock_documentation_en-US" xlink:label="lab_gmab_ScheduleOfPortfolioOfMarketableSecuritiesTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Tabular disclosure of portfolio of marketable securities.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_ScheduleOfPortfolioOfMarketableSecuritiesTableTextBlock" xlink:href="gmab-20251231.xsd#gmab_ScheduleOfPortfolioOfMarketableSecuritiesTableTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_ScheduleOfPortfolioOfMarketableSecuritiesTableTextBlock" xlink:to="lab_gmab_ScheduleOfPortfolioOfMarketableSecuritiesTableTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_DanishMortgageBackedSecuritiesMember_f773e53b-a9db-4747-a4f2-2a549f686107_terseLabel_en-US" xlink:label="lab_gmab_DanishMortgageBackedSecuritiesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Danish mortgage-backed securities</link:label>
    <link:label id="lab_gmab_DanishMortgageBackedSecuritiesMember_label_en-US" xlink:label="lab_gmab_DanishMortgageBackedSecuritiesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Danish Mortgage-Backed Securities [Member]</link:label>
    <link:label id="lab_gmab_DanishMortgageBackedSecuritiesMember_documentation_en-US" xlink:label="lab_gmab_DanishMortgageBackedSecuritiesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This member stands for Danish mortgage-backed securities.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_DanishMortgageBackedSecuritiesMember" xlink:href="gmab-20251231.xsd#gmab_DanishMortgageBackedSecuritiesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_DanishMortgageBackedSecuritiesMember" xlink:to="lab_gmab_DanishMortgageBackedSecuritiesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_OtherCurrentPayables_0015bcb6-cde7-42ca-8761-6866987c64e2_terseLabel_en-US" xlink:label="lab_ifrs-full_OtherCurrentPayables" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other payables</link:label>
    <link:label id="lab_ifrs-full_OtherCurrentPayables_37e472a6-1929-4b17-9848-1b030df478e6_verboseLabel_en-US" xlink:label="lab_ifrs-full_OtherCurrentPayables" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Current other payables</link:label>
    <link:label id="lab_ifrs-full_OtherCurrentPayables_label_en-US" xlink:label="lab_ifrs-full_OtherCurrentPayables" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other current payables</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherCurrentPayables" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherCurrentPayables"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OtherCurrentPayables" xlink:to="lab_ifrs-full_OtherCurrentPayables" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityAddressPostalZipCode_019b0ccf-d832-7d30-9c80-d6190122b1dc_terseLabel_en-US" xlink:label="lab_dei_EntityAddressPostalZipCode" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Address, Postal Zip Code</link:label>
    <link:label id="lab_dei_EntityAddressPostalZipCode_label_en-US" xlink:label="lab_dei_EntityAddressPostalZipCode" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Address, Postal Zip Code</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressPostalZipCode"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityAddressPostalZipCode" xlink:to="lab_dei_EntityAddressPostalZipCode" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_MerusMember_019bc632-660a-7b56-a661-523566d1af46_terseLabel_en-US" xlink:label="lab_gmab_MerusMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Merus</link:label>
    <link:label id="lab_gmab_MerusMember_label_en-US" xlink:label="lab_gmab_MerusMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Merus [Member]</link:label>
    <link:label id="lab_gmab_MerusMember_documentation_en-US" xlink:label="lab_gmab_MerusMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Merus</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_MerusMember" xlink:href="gmab-20251231.xsd#gmab_MerusMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_MerusMember" xlink:to="lab_gmab_MerusMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_PresentationOfLeasesForLesseeAbstract_019b1d80-21f5-72ed-be9f-026169bdd012_terseLabel_en-US" xlink:label="lab_ifrs-full_PresentationOfLeasesForLesseeAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Right-of-use assets</link:label>
    <link:label id="lab_ifrs-full_PresentationOfLeasesForLesseeAbstract_label_en-US" xlink:label="lab_ifrs-full_PresentationOfLeasesForLesseeAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Presentation of leases for lessee [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PresentationOfLeasesForLesseeAbstract" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PresentationOfLeasesForLesseeAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_PresentationOfLeasesForLesseeAbstract" xlink:to="lab_ifrs-full_PresentationOfLeasesForLesseeAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CashAndCashEquivalentsRecognisedAsOfAcquisitionDate_fae3d4e6-d0a3-4cad-881f-3f009ca8160d_terseLabel_en-US" xlink:label="lab_ifrs-full_CashAndCashEquivalentsRecognisedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash and cash equivalents</link:label>
    <link:label id="lab_ifrs-full_CashAndCashEquivalentsRecognisedAsOfAcquisitionDate_5eef98f0-617e-41f2-aa95-00d6e1d66f70_negatedLabel_en-US" xlink:label="lab_ifrs-full_CashAndCashEquivalentsRecognisedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Cash acquired</link:label>
    <link:label id="lab_ifrs-full_CashAndCashEquivalentsRecognisedAsOfAcquisitionDate_51f46cf7-3753-498f-ac37-c1133f8d08e1_verboseLabel_en-US" xlink:label="lab_ifrs-full_CashAndCashEquivalentsRecognisedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Cash and cash equivalents</link:label>
    <link:label id="lab_ifrs-full_CashAndCashEquivalentsRecognisedAsOfAcquisitionDate_label_en-US" xlink:label="lab_ifrs-full_CashAndCashEquivalentsRecognisedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash and cash equivalents recognised as of acquisition date</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashAndCashEquivalentsRecognisedAsOfAcquisitionDate" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CashAndCashEquivalentsRecognisedAsOfAcquisitionDate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CashAndCashEquivalentsRecognisedAsOfAcquisitionDate" xlink:to="lab_ifrs-full_CashAndCashEquivalentsRecognisedAsOfAcquisitionDate" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_DocumentInformationLineItems_019b0cd3-6716-74d8-9cde-cf3c08f4d795_terseLabel_en-US" xlink:label="lab_dei_DocumentInformationLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Document Information [Line Items]</link:label>
    <link:label id="lab_dei_DocumentInformationLineItems_label_en-US" xlink:label="lab_dei_DocumentInformationLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Document Information [Line Items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationLineItems" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentInformationLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_DocumentInformationLineItems" xlink:to="lab_dei_DocumentInformationLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_NetLeverageRatio_019c521b-6787-75de-ae37-582bcc0365f5_terseLabel_en-US" xlink:label="lab_gmab_NetLeverageRatio" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net leverage ratio</link:label>
    <link:label id="lab_gmab_NetLeverageRatio_label_en-US" xlink:label="lab_gmab_NetLeverageRatio" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Leverage Ratio</link:label>
    <link:label id="lab_gmab_NetLeverageRatio_documentation_en-US" xlink:label="lab_gmab_NetLeverageRatio" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Net Leverage Ratio</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_NetLeverageRatio" xlink:href="gmab-20251231.xsd#gmab_NetLeverageRatio"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_NetLeverageRatio" xlink:to="lab_gmab_NetLeverageRatio" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_ProfoundbioIncMember_a6df8f29-dafe-42e6-9d99-7d7a2e81d650_terseLabel_en-US" xlink:label="lab_gmab_ProfoundbioIncMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">ProfoundBio Inc.</link:label>
    <link:label id="lab_gmab_ProfoundbioIncMember_label_en-US" xlink:label="lab_gmab_ProfoundbioIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Profoundbio Inc [Member]</link:label>
    <link:label id="lab_gmab_ProfoundbioIncMember_documentation_en-US" xlink:label="lab_gmab_ProfoundbioIncMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This member stands for ProfoundBio, Inc</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_ProfoundbioIncMember" xlink:href="gmab-20251231.xsd#gmab_ProfoundbioIncMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_ProfoundbioIncMember" xlink:to="lab_gmab_ProfoundbioIncMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForRecognitionOfRevenue_019b083c-28d0-74f8-a1c7-b7ec7c97d475_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForRecognitionOfRevenue" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Revenue</link:label>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForRecognitionOfRevenue_label_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForRecognitionOfRevenue" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Description of accounting policy for recognition of revenue [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForRecognitionOfRevenue" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DescriptionOfAccountingPolicyForRecognitionOfRevenue"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DescriptionOfAccountingPolicyForRecognitionOfRevenue" xlink:to="lab_ifrs-full_DescriptionOfAccountingPolicyForRecognitionOfRevenue" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_WeightedAverageExercisePriceOfWarrantsExercised_b0f07af5-558f-43ae-a179-4e91e4e06d3e_terseLabel_en-US" xlink:label="lab_gmab_WeightedAverageExercisePriceOfWarrantsExercised" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Weighted average exercise price of warrant exercised (in DKK per share)</link:label>
    <link:label id="lab_gmab_WeightedAverageExercisePriceOfWarrantsExercised_label_en-US" xlink:label="lab_gmab_WeightedAverageExercisePriceOfWarrantsExercised" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Weighted Average Exercise Price Of Warrants Exercised</link:label>
    <link:label id="lab_gmab_WeightedAverageExercisePriceOfWarrantsExercised_documentation_en-US" xlink:label="lab_gmab_WeightedAverageExercisePriceOfWarrantsExercised" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Exercise price per share or per unit of warrants exercised during the period.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_WeightedAverageExercisePriceOfWarrantsExercised" xlink:href="gmab-20251231.xsd#gmab_WeightedAverageExercisePriceOfWarrantsExercised"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_WeightedAverageExercisePriceOfWarrantsExercised" xlink:to="lab_gmab_WeightedAverageExercisePriceOfWarrantsExercised" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_WeightedAverageExercisePriceOfWarrantsForfeited_e6005452-362f-47a8-b3e1-234a2bfc8394_terseLabel_en-US" xlink:label="lab_gmab_WeightedAverageExercisePriceOfWarrantsForfeited" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Weighted average exercise price of warrants cancelled (in DKK per share)</link:label>
    <link:label id="lab_gmab_WeightedAverageExercisePriceOfWarrantsForfeited_label_en-US" xlink:label="lab_gmab_WeightedAverageExercisePriceOfWarrantsForfeited" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Weighted Average Exercise Price Of Warrants Forfeited</link:label>
    <link:label id="lab_gmab_WeightedAverageExercisePriceOfWarrantsForfeited_documentation_en-US" xlink:label="lab_gmab_WeightedAverageExercisePriceOfWarrantsForfeited" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Exercise price per share or per unit of warrants cancelled during the period.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_WeightedAverageExercisePriceOfWarrantsForfeited" xlink:href="gmab-20251231.xsd#gmab_WeightedAverageExercisePriceOfWarrantsForfeited"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_WeightedAverageExercisePriceOfWarrantsForfeited" xlink:to="lab_gmab_WeightedAverageExercisePriceOfWarrantsForfeited" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ForeignExchangeLoss_019c49af-298e-7f41-91b2-f2271c7c04fe_negatedTerseLabel_en-US" xlink:label="lab_ifrs-full_ForeignExchangeLoss" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Foreign exchange rate loss</link:label>
    <link:label id="lab_ifrs-full_ForeignExchangeLoss_019c49b3-6580-7355-862c-5b897d1d7372_negatedLabel_en-US" xlink:label="lab_ifrs-full_ForeignExchangeLoss" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Foreign exchange rate loss</link:label>
    <link:label id="lab_ifrs-full_ForeignExchangeLoss_label_en-US" xlink:label="lab_ifrs-full_ForeignExchangeLoss" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Foreign exchange loss</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ForeignExchangeLoss" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ForeignExchangeLoss"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ForeignExchangeLoss" xlink:to="lab_ifrs-full_ForeignExchangeLoss" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_NumberOfProductsInActiveClinicalDevelopment_57d09195-8c42-4f91-a63a-2602c96beda1_terseLabel_en-US" xlink:label="lab_gmab_NumberOfProductsInActiveClinicalDevelopment" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of products were in active clinical development</link:label>
    <link:label id="lab_gmab_NumberOfProductsInActiveClinicalDevelopment_label_en-US" xlink:label="lab_gmab_NumberOfProductsInActiveClinicalDevelopment" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number of Products in Active Clinical Development</link:label>
    <link:label id="lab_gmab_NumberOfProductsInActiveClinicalDevelopment_documentation_en-US" xlink:label="lab_gmab_NumberOfProductsInActiveClinicalDevelopment" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The number of DuoBody-based products created under this collaboration were in active clinical development.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_NumberOfProductsInActiveClinicalDevelopment" xlink:href="gmab-20251231.xsd#gmab_NumberOfProductsInActiveClinicalDevelopment"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_NumberOfProductsInActiveClinicalDevelopment" xlink:to="lab_gmab_NumberOfProductsInActiveClinicalDevelopment" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_ExercisePriceWarrantsGranted_57f30281-4517-4309-85d4-e69ed5f1ae88_terseLabel_en-US" xlink:label="lab_gmab_ExercisePriceWarrantsGranted" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Exercise price warrants granted (in DKK per share)</link:label>
    <link:label id="lab_gmab_ExercisePriceWarrantsGranted_label_en-US" xlink:label="lab_gmab_ExercisePriceWarrantsGranted" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Exercise Price, Warrants Granted</link:label>
    <link:label id="lab_gmab_ExercisePriceWarrantsGranted_documentation_en-US" xlink:label="lab_gmab_ExercisePriceWarrantsGranted" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The exercise price of share warrants granted.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_ExercisePriceWarrantsGranted" xlink:href="gmab-20251231.xsd#gmab_ExercisePriceWarrantsGranted"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_ExercisePriceWarrantsGranted" xlink:to="lab_gmab_ExercisePriceWarrantsGranted" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_DisclosureOfDetailedInformationAboutChangesInPresentationCurrencyTable_66a59504-76f8-4258-8e52-d245cb6a1949_terseLabel_en-US" xlink:label="lab_gmab_DisclosureOfDetailedInformationAboutChangesInPresentationCurrencyTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure Of Detailed Information About Changes in Presentation Currency [Table]</link:label>
    <link:label id="lab_gmab_DisclosureOfDetailedInformationAboutChangesInPresentationCurrencyTable_label_en-US" xlink:label="lab_gmab_DisclosureOfDetailedInformationAboutChangesInPresentationCurrencyTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure Of Detailed Information About Changes in Presentation Currency [Table]</link:label>
    <link:label id="lab_gmab_DisclosureOfDetailedInformationAboutChangesInPresentationCurrencyTable_documentation_en-US" xlink:label="lab_gmab_DisclosureOfDetailedInformationAboutChangesInPresentationCurrencyTable" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Disclosure Of Detailed Information About Changes in Presentation Currency</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_DisclosureOfDetailedInformationAboutChangesInPresentationCurrencyTable" xlink:href="gmab-20251231.xsd#gmab_DisclosureOfDetailedInformationAboutChangesInPresentationCurrencyTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_DisclosureOfDetailedInformationAboutChangesInPresentationCurrencyTable" xlink:to="lab_gmab_DisclosureOfDetailedInformationAboutChangesInPresentationCurrencyTable" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_Cash_1e9e7980-ae4e-4987-a8e1-7f7ed17f7922_terseLabel_en-US" xlink:label="lab_ifrs-full_Cash" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Bank deposits</link:label>
    <link:label id="lab_ifrs-full_Cash_label_en-US" xlink:label="lab_ifrs-full_Cash" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Cash" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Cash"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_Cash" xlink:to="lab_ifrs-full_Cash" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DepreciationAmortisationAndImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss_019be51a-dbce-7443-add5-819d8564e4f3_terseLabel_en-US" xlink:label="lab_ifrs-full_DepreciationAmortisationAndImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Depreciation and impairment loss recognised in profit or loss</link:label>
    <link:label id="lab_ifrs-full_DepreciationAmortisationAndImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss_label_en-US" xlink:label="lab_ifrs-full_DepreciationAmortisationAndImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Depreciation, amortisation and impairment loss (reversal of impairment loss) recognised in profit or loss</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DepreciationAmortisationAndImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DepreciationAmortisationAndImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DepreciationAmortisationAndImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss" xlink:to="lab_ifrs-full_DepreciationAmortisationAndImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CashFlowsFromUsedInInvestingActivitiesAbstract_553f1b82-e572-49f6-bc0c-3dad7f2f4eaf_terseLabel_en-US" xlink:label="lab_ifrs-full_CashFlowsFromUsedInInvestingActivitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash flows from investing activities:</link:label>
    <link:label id="lab_ifrs-full_CashFlowsFromUsedInInvestingActivitiesAbstract_label_en-US" xlink:label="lab_ifrs-full_CashFlowsFromUsedInInvestingActivitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash flows from (used in) investing activities [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInInvestingActivitiesAbstract" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CashFlowsFromUsedInInvestingActivitiesAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CashFlowsFromUsedInInvestingActivitiesAbstract" xlink:to="lab_ifrs-full_CashFlowsFromUsedInInvestingActivitiesAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DilutiveEffectOfConvertibleInstrumentsOnNumberOfOrdinaryShares_1e469c86-785c-4073-84d4-9223460fc811_netLabel_en-US" xlink:label="lab_ifrs-full_DilutiveEffectOfConvertibleInstrumentsOnNumberOfOrdinaryShares" xlink:role="http://www.xbrl.org/2009/role/netLabel" xlink:type="resource" xml:lang="en-US">Adjustments for share-based instruments, dilution (in shares)</link:label>
    <link:label id="lab_ifrs-full_DilutiveEffectOfConvertibleInstrumentsOnNumberOfOrdinaryShares_label_en-US" xlink:label="lab_ifrs-full_DilutiveEffectOfConvertibleInstrumentsOnNumberOfOrdinaryShares" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Dilutive effect of convertible instruments on weighted average number of ordinary shares</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DilutiveEffectOfConvertibleInstrumentsOnNumberOfOrdinaryShares" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DilutiveEffectOfConvertibleInstrumentsOnNumberOfOrdinaryShares"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DilutiveEffectOfConvertibleInstrumentsOnNumberOfOrdinaryShares" xlink:to="lab_ifrs-full_DilutiveEffectOfConvertibleInstrumentsOnNumberOfOrdinaryShares" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_NumberOfWarrantsIssued_28b2eeac-dac7-4d7d-9cea-30cd41897faa_terseLabel_en-US" xlink:label="lab_gmab_NumberOfWarrantsIssued" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Warrants issued (in shares)</link:label>
    <link:label id="lab_gmab_NumberOfWarrantsIssued_label_en-US" xlink:label="lab_gmab_NumberOfWarrantsIssued" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number Of Warrants Issued</link:label>
    <link:label id="lab_gmab_NumberOfWarrantsIssued_documentation_en-US" xlink:label="lab_gmab_NumberOfWarrantsIssued" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Number of warrants issued.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_NumberOfWarrantsIssued" xlink:href="gmab-20251231.xsd#gmab_NumberOfWarrantsIssued"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_NumberOfWarrantsIssued" xlink:to="lab_gmab_NumberOfWarrantsIssued" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions_9dbbf2b1-4fc7-4009-8b8c-444066078b4c_terseLabel_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share-based compensation expenses</link:label>
    <link:label id="lab_ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions_label_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (decrease) through share-based payment transactions, equity</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions" xlink:to="lab_ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_InProcessResearchAndDevelopment.Member_822a08f3-5710-4bb0-ae37-907576304927_terseLabel_en-US" xlink:label="lab_gmab_InProcessResearchAndDevelopment.Member" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Acquired IPR&amp;D</link:label>
    <link:label id="lab_gmab_InProcessResearchAndDevelopment.Member_ebcf500f-5709-4115-ab78-91a8db034ab0_verboseLabel_en-US" xlink:label="lab_gmab_InProcessResearchAndDevelopment.Member" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">IPR&amp;D intangible asset</link:label>
    <link:label id="lab_gmab_InProcessResearchAndDevelopment.Member_label_en-US" xlink:label="lab_gmab_InProcessResearchAndDevelopment.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">In Process Research and Development. [Member]</link:label>
    <link:label id="lab_gmab_InProcessResearchAndDevelopment.Member_documentation_en-US" xlink:label="lab_gmab_InProcessResearchAndDevelopment.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">In process investigation of new knowledge useful in developing new product or service or new process or technique or improvement to existing product or process, and translation of knowledge into plan or design for new product or process or for improvement to existing product or process.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_InProcessResearchAndDevelopment.Member" xlink:href="gmab-20251231.xsd#gmab_InProcessResearchAndDevelopment.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_InProcessResearchAndDevelopment.Member" xlink:to="lab_gmab_InProcessResearchAndDevelopment.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_LeaseLiabilitiesAbstract_4d61def2-3930-41ba-9a6e-effd2a2f9359_terseLabel_en-US" xlink:label="lab_ifrs-full_LeaseLiabilitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Lease liabilities</link:label>
    <link:label id="lab_ifrs-full_LeaseLiabilitiesAbstract_label_en-US" xlink:label="lab_ifrs-full_LeaseLiabilitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lease liabilities [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LeaseLiabilitiesAbstract" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LeaseLiabilitiesAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_LeaseLiabilitiesAbstract" xlink:to="lab_ifrs-full_LeaseLiabilitiesAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_OtherNoncurrentPayables_e35182c6-16e7-4921-b1c0-2843ff05fc57_verboseLabel_en-US" xlink:label="lab_ifrs-full_OtherNoncurrentPayables" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Other payables</link:label>
    <link:label id="lab_ifrs-full_OtherNoncurrentPayables_abdc2d76-c5e2-4ae1-bbe5-b958917bb9af_terseLabel_en-US" xlink:label="lab_ifrs-full_OtherNoncurrentPayables" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Non-current other payables</link:label>
    <link:label id="lab_ifrs-full_OtherNoncurrentPayables_label_en-US" xlink:label="lab_ifrs-full_OtherNoncurrentPayables" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other non-current payables</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherNoncurrentPayables" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherNoncurrentPayables"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OtherNoncurrentPayables" xlink:to="lab_ifrs-full_OtherNoncurrentPayables" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_NoncurrentAssets_865b2513-b7c3-4904-b242-e3d6320800a9_totalLabel_en-US" xlink:label="lab_ifrs-full_NoncurrentAssets" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total non-current assets</link:label>
    <link:label id="lab_ifrs-full_NoncurrentAssets_label_en-US" xlink:label="lab_ifrs-full_NoncurrentAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Non-current assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentAssets" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NoncurrentAssets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_NoncurrentAssets" xlink:to="lab_ifrs-full_NoncurrentAssets" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_ResultsForTheYearAbstract_label_en-US" xlink:label="lab_gmab_ResultsForTheYearAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Results for the Year [Abstract]</link:label>
    <link:label id="lab_gmab_ResultsForTheYearAbstract_documentation_en-US" xlink:label="lab_gmab_ResultsForTheYearAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">No definition available.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_ResultsForTheYearAbstract" xlink:href="gmab-20251231.xsd#gmab_ResultsForTheYearAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_ResultsForTheYearAbstract" xlink:to="lab_gmab_ResultsForTheYearAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_MichaelKavanaghMember_019b2188-16b1-7a88-95c9-9c4bf9de3e2e_terseLabel_en-US" xlink:label="lab_gmab_MichaelKavanaghMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Michael Kavanagh</link:label>
    <link:label id="lab_gmab_MichaelKavanaghMember_label_en-US" xlink:label="lab_gmab_MichaelKavanaghMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Michael Kavanagh [Member]</link:label>
    <link:label id="lab_gmab_MichaelKavanaghMember_documentation_en-US" xlink:label="lab_gmab_MichaelKavanaghMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Michael Kavanagh</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_MichaelKavanaghMember" xlink:href="gmab-20251231.xsd#gmab_MichaelKavanaghMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_MichaelKavanaghMember" xlink:to="lab_gmab_MichaelKavanaghMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis_f32f5a31-3e88-4e46-a8a9-388278758d67_terseLabel_en-US" xlink:label="lab_ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Classes of property, plant and equipment [axis]</link:label>
    <link:label id="lab_ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis_label_en-US" xlink:label="lab_ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Classes of property, plant and equipment [axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis" xlink:to="lab_ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLoss_019be551-fb0f-7f5b-9759-d6c96137cb46_terseLabel_en-US" xlink:label="lab_ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLoss" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Foreign exchange gain (loss)</link:label>
    <link:label id="lab_ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLoss_label_en-US" xlink:label="lab_ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLoss" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Foreign exchange gain (loss)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLoss" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLoss"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLoss" xlink:to="lab_ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLoss" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ProceedsFromExerciseOfWarrants_8d4880a0-5d57-4154-8553-2c135ff97ce8_terseLabel_en-US" xlink:label="lab_ifrs-full_ProceedsFromExerciseOfWarrants" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Warrants exercised</link:label>
    <link:label id="lab_ifrs-full_ProceedsFromExerciseOfWarrants_label_en-US" xlink:label="lab_ifrs-full_ProceedsFromExerciseOfWarrants" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proceeds from exercise of warrants</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProceedsFromExerciseOfWarrants" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProceedsFromExerciseOfWarrants"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ProceedsFromExerciseOfWarrants" xlink:to="lab_ifrs-full_ProceedsFromExerciseOfWarrants" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain_cc8555c4-1b01-4158-9134-b6212009c315_terseLabel_en-US" xlink:label="lab_ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Classes of property, plant and equipment [domain]</link:label>
    <link:label id="lab_ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain_label_en-US" xlink:label="lab_ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Classes of property, plant and equipment [domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain" xlink:to="lab_ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_GainLossOnMarketableSecuritiesNet_cb69f31b-dd13-402b-a611-05efcbdaa7a0_terseLabel_en-US" xlink:label="lab_gmab_GainLossOnMarketableSecuritiesNet" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Gain (loss) on marketable securities, net</link:label>
    <link:label id="lab_gmab_GainLossOnMarketableSecuritiesNet_label_en-US" xlink:label="lab_gmab_GainLossOnMarketableSecuritiesNet" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Gain (Loss) On Marketable Securities, Net</link:label>
    <link:label id="lab_gmab_GainLossOnMarketableSecuritiesNet_documentation_en-US" xlink:label="lab_gmab_GainLossOnMarketableSecuritiesNet" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Amount of gain (loss) on marketable securities, net.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_GainLossOnMarketableSecuritiesNet" xlink:href="gmab-20251231.xsd#gmab_GainLossOnMarketableSecuritiesNet"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_GainLossOnMarketableSecuritiesNet" xlink:to="lab_gmab_GainLossOnMarketableSecuritiesNet" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_DescriptionOfAccountingPolicyForSellingGeneralAndAdministrativeExpensesPolicyTextBlock_019bbbcd-f599-7dac-9995-a5c4929d7d74_terseLabel_en-US" xlink:label="lab_gmab_DescriptionOfAccountingPolicyForSellingGeneralAndAdministrativeExpensesPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Selling, General and Administrative Expenses</link:label>
    <link:label id="lab_gmab_DescriptionOfAccountingPolicyForSellingGeneralAndAdministrativeExpensesPolicyTextBlock_label_en-US" xlink:label="lab_gmab_DescriptionOfAccountingPolicyForSellingGeneralAndAdministrativeExpensesPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Description Of Accounting Policy For Selling General And Administrative Expenses [Policy Text Block]</link:label>
    <link:label id="lab_gmab_DescriptionOfAccountingPolicyForSellingGeneralAndAdministrativeExpensesPolicyTextBlock_documentation_en-US" xlink:label="lab_gmab_DescriptionOfAccountingPolicyForSellingGeneralAndAdministrativeExpensesPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Description Of Accounting Policy For Selling General And Administrative Expenses</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_DescriptionOfAccountingPolicyForSellingGeneralAndAdministrativeExpensesPolicyTextBlock" xlink:href="gmab-20251231.xsd#gmab_DescriptionOfAccountingPolicyForSellingGeneralAndAdministrativeExpensesPolicyTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_DescriptionOfAccountingPolicyForSellingGeneralAndAdministrativeExpensesPolicyTextBlock" xlink:to="lab_gmab_DescriptionOfAccountingPolicyForSellingGeneralAndAdministrativeExpensesPolicyTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_AuditorsRemunerationForAuditRelatedServices_697c1ba4-2b13-4a01-8f29-ee93bcf37ab8_terseLabel_en-US" xlink:label="lab_gmab_AuditorsRemunerationForAuditRelatedServices" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Audit-related fees</link:label>
    <link:label id="lab_gmab_AuditorsRemunerationForAuditRelatedServices_label_en-US" xlink:label="lab_gmab_AuditorsRemunerationForAuditRelatedServices" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Auditor's Remuneration For Audit Related Services</link:label>
    <link:label id="lab_gmab_AuditorsRemunerationForAuditRelatedServices_documentation_en-US" xlink:label="lab_gmab_AuditorsRemunerationForAuditRelatedServices" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The amount of fees paid or payable to the entity's auditors for audit related services.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_AuditorsRemunerationForAuditRelatedServices" xlink:href="gmab-20251231.xsd#gmab_AuditorsRemunerationForAuditRelatedServices"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_AuditorsRemunerationForAuditRelatedServices" xlink:to="lab_gmab_AuditorsRemunerationForAuditRelatedServices" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityAddressCountry_019b0cd0-8a29-72c9-8d4b-11b8f4bf85be_terseLabel_en-US" xlink:label="lab_dei_EntityAddressCountry" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Address, Country</link:label>
    <link:label id="lab_dei_EntityAddressCountry_label_en-US" xlink:label="lab_dei_EntityAddressCountry" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Address, Country</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCountry" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressCountry"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityAddressCountry" xlink:to="lab_dei_EntityAddressCountry" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_DisclosureOfReceivablesLineItems_35d26785-8a1a-41c4-8d52-b944542d575a_terseLabel_en-US" xlink:label="lab_gmab_DisclosureOfReceivablesLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure Of Receivables [Line Items]</link:label>
    <link:label id="lab_gmab_DisclosureOfReceivablesLineItems_label_en-US" xlink:label="lab_gmab_DisclosureOfReceivablesLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure Of Receivables [Line Items]</link:label>
    <link:label id="lab_gmab_DisclosureOfReceivablesLineItems_documentation_en-US" xlink:label="lab_gmab_DisclosureOfReceivablesLineItems" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Line item of receivables.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_DisclosureOfReceivablesLineItems" xlink:href="gmab-20251231.xsd#gmab_DisclosureOfReceivablesLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_DisclosureOfReceivablesLineItems" xlink:to="lab_gmab_DisclosureOfReceivablesLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_currency_EUR_9cb939c4-d120-4ca0-8294-4ac6957387ef_terseLabel_en-US" xlink:label="lab_currency_EUR" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">EUR</link:label>
    <link:label id="lab_currency_EUR_label_en-US" xlink:label="lab_currency_EUR" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Euro Member Countries, Euro</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_currency_EUR" xlink:href="https://xbrl.sec.gov/currency/2025/currency-2025.xsd#currency_EUR"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_currency_EUR" xlink:to="lab_currency_EUR" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_ReimbursementRevenueMember_88a8494c-8351-4ceb-aff1-87f4e97c8b14_terseLabel_en-US" xlink:label="lab_gmab_ReimbursementRevenueMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Reimbursement revenue</link:label>
    <link:label id="lab_gmab_ReimbursementRevenueMember_label_en-US" xlink:label="lab_gmab_ReimbursementRevenueMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Reimbursement Revenue [Member]</link:label>
    <link:label id="lab_gmab_ReimbursementRevenueMember_documentation_en-US" xlink:label="lab_gmab_ReimbursementRevenueMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This member stands for reimbursement income.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_ReimbursementRevenueMember" xlink:href="gmab-20251231.xsd#gmab_ReimbursementRevenueMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_ReimbursementRevenueMember" xlink:to="lab_gmab_ReimbursementRevenueMember" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_OtherLiabilitiesRecognisedAsOfAcquisitionDate_019c4c21-20ff-77ed-9b51-04f66396bab6_negatedTerseLabel_en-US" xlink:label="lab_gmab_OtherLiabilitiesRecognisedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Other liabilities</link:label>
    <link:label id="lab_gmab_OtherLiabilitiesRecognisedAsOfAcquisitionDate_label_en-US" xlink:label="lab_gmab_OtherLiabilitiesRecognisedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Liabilities Recognised As Of Acquisition Date</link:label>
    <link:label id="lab_gmab_OtherLiabilitiesRecognisedAsOfAcquisitionDate_documentation_en-US" xlink:label="lab_gmab_OtherLiabilitiesRecognisedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Other Liabilities Recognised As Of Acquisition Date</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_OtherLiabilitiesRecognisedAsOfAcquisitionDate" xlink:href="gmab-20251231.xsd#gmab_OtherLiabilitiesRecognisedAsOfAcquisitionDate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_OtherLiabilitiesRecognisedAsOfAcquisitionDate" xlink:to="lab_gmab_OtherLiabilitiesRecognisedAsOfAcquisitionDate" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillLineItems_bb690480-de6e-4c59-9010-1ad6c9908ba7_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure of reconciliation of changes in intangible assets and goodwill [line items]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillLineItems_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of reconciliation of changes in intangible assets and goodwill [line items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillLineItems" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillLineItems" xlink:to="lab_ifrs-full_DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_EffectOfExchangeRateChangesOnCashAndCashEquivalents_b77848d6-26f9-4401-a9c5-64c52a01f6bc_terseLabel_en-US" xlink:label="lab_ifrs-full_EffectOfExchangeRateChangesOnCashAndCashEquivalents" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Exchange rate adjustments</link:label>
    <link:label id="lab_ifrs-full_EffectOfExchangeRateChangesOnCashAndCashEquivalents_label_en-US" xlink:label="lab_ifrs-full_EffectOfExchangeRateChangesOnCashAndCashEquivalents" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Effect of exchange rate changes on cash and cash equivalents</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EffectOfExchangeRateChangesOnCashAndCashEquivalents" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_EffectOfExchangeRateChangesOnCashAndCashEquivalents"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_EffectOfExchangeRateChangesOnCashAndCashEquivalents" xlink:to="lab_ifrs-full_EffectOfExchangeRateChangesOnCashAndCashEquivalents" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_IntegrationRelatedChargesRelatedToAcquisitions_019c4836-8455-7ad3-b9fd-71e449c4f14b_terseLabel_en-US" xlink:label="lab_gmab_IntegrationRelatedChargesRelatedToAcquisitions" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Integration related charges</link:label>
    <link:label id="lab_gmab_IntegrationRelatedChargesRelatedToAcquisitions_label_en-US" xlink:label="lab_gmab_IntegrationRelatedChargesRelatedToAcquisitions" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Integration Related Charges Related To Acquisitions</link:label>
    <link:label id="lab_gmab_IntegrationRelatedChargesRelatedToAcquisitions_documentation_en-US" xlink:label="lab_gmab_IntegrationRelatedChargesRelatedToAcquisitions" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Integration Related Charges Related To Acquisitions</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_IntegrationRelatedChargesRelatedToAcquisitions" xlink:href="gmab-20251231.xsd#gmab_IntegrationRelatedChargesRelatedToAcquisitions"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_IntegrationRelatedChargesRelatedToAcquisitions" xlink:to="lab_gmab_IntegrationRelatedChargesRelatedToAcquisitions" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForForeignCurrencyTranslationExplanatory_019bbbc6-5090-75c8-988e-5b77058e9fe8_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForForeignCurrencyTranslationExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Foreign Currency</link:label>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForForeignCurrencyTranslationExplanatory_label_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForForeignCurrencyTranslationExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Description of accounting policy for foreign currency translation [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForForeignCurrencyTranslationExplanatory" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DescriptionOfAccountingPolicyForForeignCurrencyTranslationExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DescriptionOfAccountingPolicyForForeignCurrencyTranslationExplanatory" xlink:to="lab_ifrs-full_DescriptionOfAccountingPolicyForForeignCurrencyTranslationExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss_8a413930-defc-491a-82bd-53136083ae1c_terseLabel_en-US" xlink:label="lab_ifrs-full_AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Impairment losses</link:label>
    <link:label id="lab_ifrs-full_AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss_label_en-US" xlink:label="lab_ifrs-full_AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Adjustments for impairment loss (reversal of impairment loss) recognised in profit or loss</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss" xlink:to="lab_ifrs-full_AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_TypesOfRevenuesAxis_b48f2fe6-50b9-47c0-91e0-e2f69c45171c_terseLabel_en-US" xlink:label="lab_gmab_TypesOfRevenuesAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Types of revenues [axis]</link:label>
    <link:label id="lab_gmab_TypesOfRevenuesAxis_label_en-US" xlink:label="lab_gmab_TypesOfRevenuesAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Types of Revenues [Axis]</link:label>
    <link:label id="lab_gmab_TypesOfRevenuesAxis_documentation_en-US" xlink:label="lab_gmab_TypesOfRevenuesAxis" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The axis of a table defines the relationship between the domain members or categories in the table and the line items or concepts that complete the table.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_TypesOfRevenuesAxis" xlink:href="gmab-20251231.xsd#gmab_TypesOfRevenuesAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_TypesOfRevenuesAxis" xlink:to="lab_gmab_TypesOfRevenuesAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_IntangibleAssetsTemporaryDifferenceMember_dc753897-b437-45c7-bc10-ac8fea97d2c8_terseLabel_en-US" xlink:label="lab_gmab_IntangibleAssetsTemporaryDifferenceMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Intangible assets</link:label>
    <link:label id="lab_gmab_IntangibleAssetsTemporaryDifferenceMember_label_en-US" xlink:label="lab_gmab_IntangibleAssetsTemporaryDifferenceMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Intangible Assets, Temporary Difference [Member]</link:label>
    <link:label id="lab_gmab_IntangibleAssetsTemporaryDifferenceMember_documentation_en-US" xlink:label="lab_gmab_IntangibleAssetsTemporaryDifferenceMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This member stands for intangible assets with respect to temporary difference.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_IntangibleAssetsTemporaryDifferenceMember" xlink:href="gmab-20251231.xsd#gmab_IntangibleAssetsTemporaryDifferenceMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_IntangibleAssetsTemporaryDifferenceMember" xlink:to="lab_gmab_IntangibleAssetsTemporaryDifferenceMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_DocumentAnnualReport_019b0cc9-c72d-7f14-8289-d3ecba73a49a_terseLabel_en-US" xlink:label="lab_dei_DocumentAnnualReport" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Document Annual Report</link:label>
    <link:label id="lab_dei_DocumentAnnualReport_label_en-US" xlink:label="lab_dei_DocumentAnnualReport" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Document Annual Report</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentAnnualReport" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentAnnualReport"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_DocumentAnnualReport" xlink:to="lab_dei_DocumentAnnualReport" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_NoncurrentContractLiabilities_15037197-c0cd-460e-86eb-01f9a3a757ba_terseLabel_en-US" xlink:label="lab_ifrs-full_NoncurrentContractLiabilities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Contract Liabilities</link:label>
    <link:label id="lab_ifrs-full_NoncurrentContractLiabilities_a6f8320c-cd31-47d5-907e-75a82aba1ab1_verboseLabel_en-US" xlink:label="lab_ifrs-full_NoncurrentContractLiabilities" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Non-current contract liabilities</link:label>
    <link:label id="lab_ifrs-full_NoncurrentContractLiabilities_label_en-US" xlink:label="lab_ifrs-full_NoncurrentContractLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Non-current contract liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentContractLiabilities" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NoncurrentContractLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_NoncurrentContractLiabilities" xlink:to="lab_ifrs-full_NoncurrentContractLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfFinancialInstrumentsTable_61fd3b37-0592-4f24-a2a4-1286d6a946b9_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfFinancialInstrumentsTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure of detailed information about financial instruments [table]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfFinancialInstrumentsTable_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfFinancialInstrumentsTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of detailed information about financial instruments [table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFinancialInstrumentsTable" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfFinancialInstrumentsTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsTable" xlink:to="lab_ifrs-full_DisclosureOfFinancialInstrumentsTable" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_GeographicalAreasDomain_8f9db686-fab4-432d-8928-900cac964a85_terseLabel_en-US" xlink:label="lab_ifrs-full_GeographicalAreasDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Geographical areas [domain]</link:label>
    <link:label id="lab_ifrs-full_GeographicalAreasDomain_label_en-US" xlink:label="lab_ifrs-full_GeographicalAreasDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Geographical areas [domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GeographicalAreasDomain" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GeographicalAreasDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_GeographicalAreasDomain" xlink:to="lab_ifrs-full_GeographicalAreasDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_AgreementsWithNovartisMember_c6d4b667-16e5-4f2d-ad73-422c8cbe1a04_verboseLabel_en-US" xlink:label="lab_gmab_AgreementsWithNovartisMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Novartis (Arzaerra/Ofatumumab)</link:label>
    <link:label id="lab_gmab_AgreementsWithNovartisMember_label_en-US" xlink:label="lab_gmab_AgreementsWithNovartisMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Agreements With Novartis [Member]</link:label>
    <link:label id="lab_gmab_AgreementsWithNovartisMember_documentation_en-US" xlink:label="lab_gmab_AgreementsWithNovartisMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This member stands for collaborative arrangement with Novartis (Arzaerra/Ofatumumab).</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_AgreementsWithNovartisMember" xlink:href="gmab-20251231.xsd#gmab_AgreementsWithNovartisMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_AgreementsWithNovartisMember" xlink:to="lab_gmab_AgreementsWithNovartisMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_TradeAndOtherCurrentReceivables_4ac7c4dc-87e0-420d-9c68-19d90d1c4ae4_terseLabel_en-US" xlink:label="lab_ifrs-full_TradeAndOtherCurrentReceivables" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Receivables</link:label>
    <link:label id="lab_ifrs-full_TradeAndOtherCurrentReceivables_5131e33b-4078-4225-b59f-74734b25ca17_verboseLabel_en-US" xlink:label="lab_ifrs-full_TradeAndOtherCurrentReceivables" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Current receivables</link:label>
    <link:label id="lab_ifrs-full_TradeAndOtherCurrentReceivables_label_en-US" xlink:label="lab_ifrs-full_TradeAndOtherCurrentReceivables" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Trade and other current receivables</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TradeAndOtherCurrentReceivables" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TradeAndOtherCurrentReceivables"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_TradeAndOtherCurrentReceivables" xlink:to="lab_ifrs-full_TradeAndOtherCurrentReceivables" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfFinancialRiskManagementExplanatory_09837de4-2eda-4d83-b55c-400c7f9d20b3_verboseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfFinancialRiskManagementExplanatory" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Capital Structure, Financial Risk and Related Items</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfFinancialRiskManagementExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfFinancialRiskManagementExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of financial risk management [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFinancialRiskManagementExplanatory" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfFinancialRiskManagementExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfFinancialRiskManagementExplanatory" xlink:to="lab_ifrs-full_DisclosureOfFinancialRiskManagementExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityInteractiveDataCurrent_019b45af-0d0d-77bb-a590-9ed1f30cff56_terseLabel_en-US" xlink:label="lab_dei_EntityInteractiveDataCurrent" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Interactive Data Current</link:label>
    <link:label id="lab_dei_EntityInteractiveDataCurrent_label_en-US" xlink:label="lab_dei_EntityInteractiveDataCurrent" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Interactive Data Current</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInteractiveDataCurrent" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityInteractiveDataCurrent"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityInteractiveDataCurrent" xlink:to="lab_dei_EntityInteractiveDataCurrent" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_ShareBasedArrangementNumberOfSharesPerRsu_d04bd398-71e2-430b-b0f7-614d2af62817_terseLabel_en-US" xlink:label="lab_gmab_ShareBasedArrangementNumberOfSharesPerRsu" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of shares per RSU (in shares)</link:label>
    <link:label id="lab_gmab_ShareBasedArrangementNumberOfSharesPerRsu_label_en-US" xlink:label="lab_gmab_ShareBasedArrangementNumberOfSharesPerRsu" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share Based Arrangement, Number Of Shares Per RSU</link:label>
    <link:label id="lab_gmab_ShareBasedArrangementNumberOfSharesPerRsu_documentation_en-US" xlink:label="lab_gmab_ShareBasedArrangementNumberOfSharesPerRsu" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Number of shares credited for one share of RSU owned by the holder under the share based payment arrangements.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_ShareBasedArrangementNumberOfSharesPerRsu" xlink:href="gmab-20251231.xsd#gmab_ShareBasedArrangementNumberOfSharesPerRsu"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_ShareBasedArrangementNumberOfSharesPerRsu" xlink:to="lab_gmab_ShareBasedArrangementNumberOfSharesPerRsu" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_FinancialEffectOfChangesInAccountingPolicyMember_019c5295-a804-7ee5-a35c-adcde38cfd32_terseLabel_en-US" xlink:label="lab_ifrs-full_FinancialEffectOfChangesInAccountingPolicyMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Reclass</link:label>
    <link:label id="lab_ifrs-full_FinancialEffectOfChangesInAccountingPolicyMember_label_en-US" xlink:label="lab_ifrs-full_FinancialEffectOfChangesInAccountingPolicyMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (decrease) due to changes in accounting policy [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialEffectOfChangesInAccountingPolicyMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialEffectOfChangesInAccountingPolicyMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_FinancialEffectOfChangesInAccountingPolicyMember" xlink:to="lab_ifrs-full_FinancialEffectOfChangesInAccountingPolicyMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfMaturityAnalysisOfOperatingLeasePaymentsTable_f607991f-a631-4a9f-a084-2e0b2d6bc62e_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfMaturityAnalysisOfOperatingLeasePaymentsTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure of maturity analysis of operating lease payments [table]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfMaturityAnalysisOfOperatingLeasePaymentsTable_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfMaturityAnalysisOfOperatingLeasePaymentsTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of maturity analysis of operating lease payments [table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfMaturityAnalysisOfOperatingLeasePaymentsTable" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfMaturityAnalysisOfOperatingLeasePaymentsTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfMaturityAnalysisOfOperatingLeasePaymentsTable" xlink:to="lab_ifrs-full_DisclosureOfMaturityAnalysisOfOperatingLeasePaymentsTable" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ConsiderationPaidReceived_019b26be-33c5-7661-a5fa-4f406b066a13_terseLabel_en-US" xlink:label="lab_ifrs-full_ConsiderationPaidReceived" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Consideration paid (received)</link:label>
    <link:label id="lab_ifrs-full_ConsiderationPaidReceived_label_en-US" xlink:label="lab_ifrs-full_ConsiderationPaidReceived" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Consideration paid (received)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ConsiderationPaidReceived" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ConsiderationPaidReceived"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ConsiderationPaidReceived" xlink:to="lab_ifrs-full_ConsiderationPaidReceived" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_LevelsOfFairValueHierarchyAxis_580ac7b0-d5de-46b7-a1a0-69575466b5f7_terseLabel_en-US" xlink:label="lab_ifrs-full_LevelsOfFairValueHierarchyAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Levels of fair value hierarchy [axis]</link:label>
    <link:label id="lab_ifrs-full_LevelsOfFairValueHierarchyAxis_label_en-US" xlink:label="lab_ifrs-full_LevelsOfFairValueHierarchyAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Levels of fair value hierarchy [axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LevelsOfFairValueHierarchyAxis" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LevelsOfFairValueHierarchyAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_LevelsOfFairValueHierarchyAxis" xlink:to="lab_ifrs-full_LevelsOfFairValueHierarchyAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_FinanceCosts_a6d0344a-71a5-43dc-9ef1-3488acec847a_negatedLabel_en-US" xlink:label="lab_ifrs-full_FinanceCosts" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Financial expenses</link:label>
    <link:label id="lab_ifrs-full_FinanceCosts_e2d91820-2439-404a-bddf-d88eb024191d_negatedTotalLabel_en-US" xlink:label="lab_ifrs-full_FinanceCosts" xlink:role="http://www.xbrl.org/2009/role/negatedTotalLabel" xlink:type="resource" xml:lang="en-US">Total financial expenses</link:label>
    <link:label id="lab_ifrs-full_FinanceCosts_label_en-US" xlink:label="lab_ifrs-full_FinanceCosts" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance costs</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinanceCosts" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinanceCosts"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_FinanceCosts" xlink:to="lab_ifrs-full_FinanceCosts" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_ResearchAndDevelopmentExpensesOfAcquiree_9d2e3ee5-f7e2-40bc-8762-0302bbf68c56_terseLabel_en-US" xlink:label="lab_gmab_ResearchAndDevelopmentExpensesOfAcquiree" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Research and development expenses</link:label>
    <link:label id="lab_gmab_ResearchAndDevelopmentExpensesOfAcquiree_label_en-US" xlink:label="lab_gmab_ResearchAndDevelopmentExpensesOfAcquiree" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Research And Development Expenses of Acquiree</link:label>
    <link:label id="lab_gmab_ResearchAndDevelopmentExpensesOfAcquiree_documentation_en-US" xlink:label="lab_gmab_ResearchAndDevelopmentExpensesOfAcquiree" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The amount of research and development expenses of the acquiree since the acquisition date included in the consolidated statement of comprehensive income.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_ResearchAndDevelopmentExpensesOfAcquiree" xlink:href="gmab-20251231.xsd#gmab_ResearchAndDevelopmentExpensesOfAcquiree"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_ResearchAndDevelopmentExpensesOfAcquiree" xlink:to="lab_gmab_ResearchAndDevelopmentExpensesOfAcquiree" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AdjustmentsForIncomeTaxExpense_158ca9f5-7091-4bbc-8640-40566cc03e4a_terseLabel_en-US" xlink:label="lab_ifrs-full_AdjustmentsForIncomeTaxExpense" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Corporate taxes paid</link:label>
    <link:label id="lab_ifrs-full_AdjustmentsForIncomeTaxExpense_label_en-US" xlink:label="lab_ifrs-full_AdjustmentsForIncomeTaxExpense" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Adjustments for income tax expense</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForIncomeTaxExpense" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AdjustmentsForIncomeTaxExpense"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AdjustmentsForIncomeTaxExpense" xlink:to="lab_ifrs-full_AdjustmentsForIncomeTaxExpense" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AcquisitionsThroughBusinessCombinationsPropertyPlantAndEquipment_ff835f37-cdcb-4b73-927d-356029126edb_terseLabel_en-US" xlink:label="lab_ifrs-full_AcquisitionsThroughBusinessCombinationsPropertyPlantAndEquipment" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Acquisitions through business combinations</link:label>
    <link:label id="lab_ifrs-full_AcquisitionsThroughBusinessCombinationsPropertyPlantAndEquipment_label_en-US" xlink:label="lab_ifrs-full_AcquisitionsThroughBusinessCombinationsPropertyPlantAndEquipment" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Acquisitions through business combinations, property, plant and equipment</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AcquisitionsThroughBusinessCombinationsPropertyPlantAndEquipment" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AcquisitionsThroughBusinessCombinationsPropertyPlantAndEquipment"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AcquisitionsThroughBusinessCombinationsPropertyPlantAndEquipment" xlink:to="lab_ifrs-full_AcquisitionsThroughBusinessCombinationsPropertyPlantAndEquipment" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_ContractLiabilitiesConsiderationReceived_019c0510-52ed-70da-9acc-95b0893ff47d_terseLabel_en-US" xlink:label="lab_gmab_ContractLiabilitiesConsiderationReceived" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Consideration received</link:label>
    <link:label id="lab_gmab_ContractLiabilitiesConsiderationReceived_label_en-US" xlink:label="lab_gmab_ContractLiabilitiesConsiderationReceived" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Contract Liabilities, Consideration Received</link:label>
    <link:label id="lab_gmab_ContractLiabilitiesConsiderationReceived_documentation_en-US" xlink:label="lab_gmab_ContractLiabilitiesConsiderationReceived" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Contract Liabilities, Consideration Received</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_ContractLiabilitiesConsiderationReceived" xlink:href="gmab-20251231.xsd#gmab_ContractLiabilitiesConsiderationReceived"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_ContractLiabilitiesConsiderationReceived" xlink:to="lab_gmab_ContractLiabilitiesConsiderationReceived" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfCreditRiskExposureTable_c343eee4-8c3b-4d18-a0e7-af0509cd8c7a_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfCreditRiskExposureTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure of credit risk exposure [table]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfCreditRiskExposureTable_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfCreditRiskExposureTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of credit risk exposure [table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfCreditRiskExposureTable" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfCreditRiskExposureTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfCreditRiskExposureTable" xlink:to="lab_ifrs-full_DisclosureOfCreditRiskExposureTable" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_NumberOfWarrantsOutstanding_19393430-2428-4a3b-bb37-4fd9532dad2a_periodStartLabel_en-US" xlink:label="lab_gmab_NumberOfWarrantsOutstanding" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Balance at beginning of period (in shares)</link:label>
    <link:label id="lab_gmab_NumberOfWarrantsOutstanding_20d34721-dd18-4a85-95bf-10156c82cd1d_periodEndLabel_en-US" xlink:label="lab_gmab_NumberOfWarrantsOutstanding" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Balance at end of period (in shares)</link:label>
    <link:label id="lab_gmab_NumberOfWarrantsOutstanding_label_en-US" xlink:label="lab_gmab_NumberOfWarrantsOutstanding" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number Of Warrants Outstanding</link:label>
    <link:label id="lab_gmab_NumberOfWarrantsOutstanding_documentation_en-US" xlink:label="lab_gmab_NumberOfWarrantsOutstanding" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The number of warrants held as of the balance sheet date.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_NumberOfWarrantsOutstanding" xlink:href="gmab-20251231.xsd#gmab_NumberOfWarrantsOutstanding"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_NumberOfWarrantsOutstanding" xlink:to="lab_gmab_NumberOfWarrantsOutstanding" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_OtherLiabilities_cdb36cd8-3958-442b-809f-30e6de2b3404_terseLabel_en-US" xlink:label="lab_ifrs-full_OtherLiabilities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other liabilities</link:label>
    <link:label id="lab_ifrs-full_OtherLiabilities_label_en-US" xlink:label="lab_ifrs-full_OtherLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherLiabilities" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OtherLiabilities" xlink:to="lab_ifrs-full_OtherLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_NonDeductibleExpensesNonTaxableIncomeAndOtherPermanentDifferencesNet_a7e3305f-18eb-4cb8-95bd-6319be679060_terseLabel_en-US" xlink:label="lab_gmab_NonDeductibleExpensesNonTaxableIncomeAndOtherPermanentDifferencesNet" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net of non-taxable income over non-deductible expenses</link:label>
    <link:label id="lab_gmab_NonDeductibleExpensesNonTaxableIncomeAndOtherPermanentDifferencesNet_label_en-US" xlink:label="lab_gmab_NonDeductibleExpensesNonTaxableIncomeAndOtherPermanentDifferencesNet" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Non Deductible Expenses Non-Taxable Income And Other Permanent Differences, Net</link:label>
    <link:label id="lab_gmab_NonDeductibleExpensesNonTaxableIncomeAndOtherPermanentDifferencesNet_documentation_en-US" xlink:label="lab_gmab_NonDeductibleExpensesNonTaxableIncomeAndOtherPermanentDifferencesNet" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The amount of non-deductible expenses/non-taxable income and other permanent differences, net</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_NonDeductibleExpensesNonTaxableIncomeAndOtherPermanentDifferencesNet" xlink:href="gmab-20251231.xsd#gmab_NonDeductibleExpensesNonTaxableIncomeAndOtherPermanentDifferencesNet"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_NonDeductibleExpensesNonTaxableIncomeAndOtherPermanentDifferencesNet" xlink:to="lab_gmab_NonDeductibleExpensesNonTaxableIncomeAndOtherPermanentDifferencesNet" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityCentralIndexKey_d85fae38-9f24-4356-adad-bd94a67bca6a_terseLabel_en-US" xlink:label="lab_dei_EntityCentralIndexKey" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Central Index Key</link:label>
    <link:label id="lab_dei_EntityCentralIndexKey_label_en-US" xlink:label="lab_dei_EntityCentralIndexKey" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Central Index Key</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCentralIndexKey"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityCentralIndexKey" xlink:to="lab_dei_EntityCentralIndexKey" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_ScheduleOfInventoryCurrent.TableTextBlock_587dfa82-fe0f-4d09-ba5f-89b44848238d_terseLabel_en-US" xlink:label="lab_gmab_ScheduleOfInventoryCurrent.TableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of inventories</link:label>
    <link:label id="lab_gmab_ScheduleOfInventoryCurrent.TableTextBlock_label_en-US" xlink:label="lab_gmab_ScheduleOfInventoryCurrent.TableTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule Of Inventory, Current. [Table Text Block]</link:label>
    <link:label id="lab_gmab_ScheduleOfInventoryCurrent.TableTextBlock_documentation_en-US" xlink:label="lab_gmab_ScheduleOfInventoryCurrent.TableTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Tabular disclosure of the carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_ScheduleOfInventoryCurrent.TableTextBlock" xlink:href="gmab-20251231.xsd#gmab_ScheduleOfInventoryCurrent.TableTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_ScheduleOfInventoryCurrent.TableTextBlock" xlink:to="lab_gmab_ScheduleOfInventoryCurrent.TableTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_IncreaseDecreaseDueToChangesInAccountingPolicyRequiredByIFRSsMember_23fe66eb-98e9-4a5b-a2ce-a3a5f677c483_terseLabel_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseDueToChangesInAccountingPolicyRequiredByIFRSsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Presentation currency change</link:label>
    <link:label id="lab_ifrs-full_IncreaseDecreaseDueToChangesInAccountingPolicyRequiredByIFRSsMember_label_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseDueToChangesInAccountingPolicyRequiredByIFRSsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (decrease) due to changes in accounting policy required by IFRSs [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseDueToChangesInAccountingPolicyRequiredByIFRSsMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseDueToChangesInAccountingPolicyRequiredByIFRSsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_IncreaseDecreaseDueToChangesInAccountingPolicyRequiredByIFRSsMember" xlink:to="lab_ifrs-full_IncreaseDecreaseDueToChangesInAccountingPolicyRequiredByIFRSsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_ExcludingNetProductSalesMember_376d919b-8d97-4b8f-8c84-6c511a354746_terseLabel_en-US" xlink:label="lab_gmab_ExcludingNetProductSalesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Excluding net product Sales</link:label>
    <link:label id="lab_gmab_ExcludingNetProductSalesMember_label_en-US" xlink:label="lab_gmab_ExcludingNetProductSalesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Excluding Net Product Sales [Member]</link:label>
    <link:label id="lab_gmab_ExcludingNetProductSalesMember_documentation_en-US" xlink:label="lab_gmab_ExcludingNetProductSalesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Excluding Net product Sales [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_ExcludingNetProductSalesMember" xlink:href="gmab-20251231.xsd#gmab_ExcludingNetProductSalesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_ExcludingNetProductSalesMember" xlink:to="lab_gmab_ExcludingNetProductSalesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_UnsecuredRevolvingCreditFacilityMember_82e239fa-4632-4ebb-8612-033ccfa42fa1_terseLabel_en-US" xlink:label="lab_gmab_UnsecuredRevolvingCreditFacilityMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unsecured revolving credit facility</link:label>
    <link:label id="lab_gmab_UnsecuredRevolvingCreditFacilityMember_label_en-US" xlink:label="lab_gmab_UnsecuredRevolvingCreditFacilityMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Unsecured Revolving, Credit Facility [Member]</link:label>
    <link:label id="lab_gmab_UnsecuredRevolvingCreditFacilityMember_documentation_en-US" xlink:label="lab_gmab_UnsecuredRevolvingCreditFacilityMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This member stands for unsecured revolving credit facility.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_UnsecuredRevolvingCreditFacilityMember" xlink:href="gmab-20251231.xsd#gmab_UnsecuredRevolvingCreditFacilityMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_UnsecuredRevolvingCreditFacilityMember" xlink:to="lab_gmab_UnsecuredRevolvingCreditFacilityMember" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_FinancialCovenantPeriodAxis_019c5221-26b2-7d7b-93fe-7d6a7aa8ddae_terseLabel_en-US" xlink:label="lab_gmab_FinancialCovenantPeriodAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Financial Covenant Period [Axis]</link:label>
    <link:label id="lab_gmab_FinancialCovenantPeriodAxis_label_en-US" xlink:label="lab_gmab_FinancialCovenantPeriodAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Financial Covenant Period [Axis]</link:label>
    <link:label id="lab_gmab_FinancialCovenantPeriodAxis_documentation_en-US" xlink:label="lab_gmab_FinancialCovenantPeriodAxis" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Financial Covenant Test</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_FinancialCovenantPeriodAxis" xlink:href="gmab-20251231.xsd#gmab_FinancialCovenantPeriodAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_FinancialCovenantPeriodAxis" xlink:to="lab_gmab_FinancialCovenantPeriodAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_MilestoneRevenueMember_13fa603f-77ec-4ce8-bd82-d051a69405d2_terseLabel_en-US" xlink:label="lab_gmab_MilestoneRevenueMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Milestone revenue</link:label>
    <link:label id="lab_gmab_MilestoneRevenueMember_label_en-US" xlink:label="lab_gmab_MilestoneRevenueMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Milestone Revenue [Member]</link:label>
    <link:label id="lab_gmab_MilestoneRevenueMember_documentation_en-US" xlink:label="lab_gmab_MilestoneRevenueMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This member stands for revenue from milestone payments.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_MilestoneRevenueMember" xlink:href="gmab-20251231.xsd#gmab_MilestoneRevenueMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_MilestoneRevenueMember" xlink:to="lab_gmab_MilestoneRevenueMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AcquisitionrelatedCostsForTransactionRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombination_a8691e29-bda1-46b7-87c3-92778c5a2bab_negatedLabel_en-US" xlink:label="lab_ifrs-full_AcquisitionrelatedCostsForTransactionRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombination" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Acquisition and integration related charges</link:label>
    <link:label id="lab_ifrs-full_AcquisitionrelatedCostsForTransactionRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombination_99a34189-8605-4d8d-911f-ddce0817c6f8_terseLabel_en-US" xlink:label="lab_ifrs-full_AcquisitionrelatedCostsForTransactionRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombination" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Acquisition and integration related charges</link:label>
    <link:label id="lab_ifrs-full_AcquisitionrelatedCostsForTransactionRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombination_label_en-US" xlink:label="lab_ifrs-full_AcquisitionrelatedCostsForTransactionRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombination" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Acquisition-related costs for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AcquisitionrelatedCostsForTransactionRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombination" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AcquisitionrelatedCostsForTransactionRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombination"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AcquisitionrelatedCostsForTransactionRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombination" xlink:to="lab_ifrs-full_AcquisitionrelatedCostsForTransactionRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombination" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_PercentageOfIncreaseDecreaseInGainLossOfMarketableSecurities_6168abe8-45d8-45b5-bb64-0ab0dc3d853a_terseLabel_en-US" xlink:label="lab_gmab_PercentageOfIncreaseDecreaseInGainLossOfMarketableSecurities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Percentage of increase (decrease) in gain (loss) of marketable securities</link:label>
    <link:label id="lab_gmab_PercentageOfIncreaseDecreaseInGainLossOfMarketableSecurities_label_en-US" xlink:label="lab_gmab_PercentageOfIncreaseDecreaseInGainLossOfMarketableSecurities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Percentage Of Increase (Decrease) In Gain (Loss) Of Marketable Securities</link:label>
    <link:label id="lab_gmab_PercentageOfIncreaseDecreaseInGainLossOfMarketableSecurities_documentation_en-US" xlink:label="lab_gmab_PercentageOfIncreaseDecreaseInGainLossOfMarketableSecurities" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Percentage of decrease in gain of marketable securities compared to prior period.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_PercentageOfIncreaseDecreaseInGainLossOfMarketableSecurities" xlink:href="gmab-20251231.xsd#gmab_PercentageOfIncreaseDecreaseInGainLossOfMarketableSecurities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_PercentageOfIncreaseDecreaseInGainLossOfMarketableSecurities" xlink:to="lab_gmab_PercentageOfIncreaseDecreaseInGainLossOfMarketableSecurities" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ProfitLossOfCombinedEntity_470deba0-3367-4d3e-9e8b-62d82e3e5eef_terseLabel_en-US" xlink:label="lab_ifrs-full_ProfitLossOfCombinedEntity" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net Profit</link:label>
    <link:label id="lab_ifrs-full_ProfitLossOfCombinedEntity_label_en-US" xlink:label="lab_ifrs-full_ProfitLossOfCombinedEntity" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Profit (loss) of combined entity as if combination occurred at beginning of period</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProfitLossOfCombinedEntity" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProfitLossOfCombinedEntity"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ProfitLossOfCombinedEntity" xlink:to="lab_ifrs-full_ProfitLossOfCombinedEntity" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForDeferredIncomeTaxExplanatory_019bbbe7-3d53-7154-9135-78dd307951f8_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForDeferredIncomeTaxExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Deferred Tax</link:label>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForDeferredIncomeTaxExplanatory_label_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForDeferredIncomeTaxExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Description of accounting policy for deferred income tax [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForDeferredIncomeTaxExplanatory" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DescriptionOfAccountingPolicyForDeferredIncomeTaxExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DescriptionOfAccountingPolicyForDeferredIncomeTaxExplanatory" xlink:to="lab_ifrs-full_DescriptionOfAccountingPolicyForDeferredIncomeTaxExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_EquityAndLiabilitiesAbstract_f36c69e6-3a9d-4ccc-9729-a835279d799a_terseLabel_en-US" xlink:label="lab_ifrs-full_EquityAndLiabilitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">SHAREHOLDERS' EQUITY AND LIABILITIES</link:label>
    <link:label id="lab_ifrs-full_EquityAndLiabilitiesAbstract_label_en-US" xlink:label="lab_ifrs-full_EquityAndLiabilitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Equity and liabilities [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EquityAndLiabilitiesAbstract" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_EquityAndLiabilitiesAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_EquityAndLiabilitiesAbstract" xlink:to="lab_ifrs-full_EquityAndLiabilitiesAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ReconciliationOfChangesInPropertyPlantAndEquipmentAbstract_c7f519ac-a847-44c8-8309-58e595e810cf_terseLabel_en-US" xlink:label="lab_ifrs-full_ReconciliationOfChangesInPropertyPlantAndEquipmentAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Reconciliation of changes in property, plant and equipment [abstract]</link:label>
    <link:label id="lab_ifrs-full_ReconciliationOfChangesInPropertyPlantAndEquipmentAbstract_label_en-US" xlink:label="lab_ifrs-full_ReconciliationOfChangesInPropertyPlantAndEquipmentAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Reconciliation of changes in property, plant and equipment [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ReconciliationOfChangesInPropertyPlantAndEquipmentAbstract" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ReconciliationOfChangesInPropertyPlantAndEquipmentAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ReconciliationOfChangesInPropertyPlantAndEquipmentAbstract" xlink:to="lab_ifrs-full_ReconciliationOfChangesInPropertyPlantAndEquipmentAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityFilerCategory_019b45af-603f-7b52-bba9-fe499921b068_terseLabel_en-US" xlink:label="lab_dei_EntityFilerCategory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Filer Category</link:label>
    <link:label id="lab_dei_EntityFilerCategory_label_en-US" xlink:label="lab_dei_EntityFilerCategory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Filer Category</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFilerCategory" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityFilerCategory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityFilerCategory" xlink:to="lab_dei_EntityFilerCategory" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_RayneWallerMember_19d98bf8-4530-4a8c-8326-0fda4b1c3440_terseLabel_en-US" xlink:label="lab_gmab_RayneWallerMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Rayne Waller</link:label>
    <link:label id="lab_gmab_RayneWallerMember_label_en-US" xlink:label="lab_gmab_RayneWallerMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Rayne Waller [Member]</link:label>
    <link:label id="lab_gmab_RayneWallerMember_documentation_en-US" xlink:label="lab_gmab_RayneWallerMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This member stands for Rayne Waller.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_RayneWallerMember" xlink:href="gmab-20251231.xsd#gmab_RayneWallerMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_RayneWallerMember" xlink:to="lab_gmab_RayneWallerMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AverageForeignExchangeRate_6b406903-afce-4470-b0ff-399a99e6bb58_terseLabel_en-US" xlink:label="lab_ifrs-full_AverageForeignExchangeRate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Average rate</link:label>
    <link:label id="lab_ifrs-full_AverageForeignExchangeRate_label_en-US" xlink:label="lab_ifrs-full_AverageForeignExchangeRate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Average foreign exchange rate</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AverageForeignExchangeRate" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AverageForeignExchangeRate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AverageForeignExchangeRate" xlink:to="lab_ifrs-full_AverageForeignExchangeRate" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipment_437d24f1-8bde-46a0-af84-82d9826b872e_verboseLabel_en-US" xlink:label="lab_ifrs-full_AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipment" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Additions for the year</link:label>
    <link:label id="lab_ifrs-full_AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipment_label_en-US" xlink:label="lab_ifrs-full_AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipment" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Additions other than through business combinations, property, plant and equipment</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipment" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipment"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipment" xlink:to="lab_ifrs-full_AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipment" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ProfitLossFromOperatingActivities_bf3e73b3-6b13-4a7d-a1f5-0164f0d30fef_totalLabel_en-US" xlink:label="lab_ifrs-full_ProfitLossFromOperatingActivities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Operating profit</link:label>
    <link:label id="lab_ifrs-full_ProfitLossFromOperatingActivities_label_en-US" xlink:label="lab_ifrs-full_ProfitLossFromOperatingActivities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Profit (loss) from operating activities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProfitLossFromOperatingActivities" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProfitLossFromOperatingActivities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ProfitLossFromOperatingActivities" xlink:to="lab_ifrs-full_ProfitLossFromOperatingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_DepreciationOnDisposalPropertyPlantAndEquipment_388fd3b1-b879-4165-b847-cd71ccb862f5_terseLabel_en-US" xlink:label="lab_gmab_DepreciationOnDisposalPropertyPlantAndEquipment" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accumulated depreciation on disposals</link:label>
    <link:label id="lab_gmab_DepreciationOnDisposalPropertyPlantAndEquipment_label_en-US" xlink:label="lab_gmab_DepreciationOnDisposalPropertyPlantAndEquipment" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Depreciation On Disposal, Property Plant And Equipment</link:label>
    <link:label id="lab_gmab_DepreciationOnDisposalPropertyPlantAndEquipment_documentation_en-US" xlink:label="lab_gmab_DepreciationOnDisposalPropertyPlantAndEquipment" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The amount of depreciation of on disposal property, plant and equipment.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_DepreciationOnDisposalPropertyPlantAndEquipment" xlink:href="gmab-20251231.xsd#gmab_DepreciationOnDisposalPropertyPlantAndEquipment"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_DepreciationOnDisposalPropertyPlantAndEquipment" xlink:to="lab_gmab_DepreciationOnDisposalPropertyPlantAndEquipment" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AuditorsRemunerationForAuditServices_451a84dc-b072-48d9-8b84-59b778776314_verboseLabel_en-US" xlink:label="lab_ifrs-full_AuditorsRemunerationForAuditServices" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Audit fees</link:label>
    <link:label id="lab_ifrs-full_AuditorsRemunerationForAuditServices_label_en-US" xlink:label="lab_ifrs-full_AuditorsRemunerationForAuditServices" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Auditor's remuneration for audit services</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AuditorsRemunerationForAuditServices" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AuditorsRemunerationForAuditServices"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AuditorsRemunerationForAuditServices" xlink:to="lab_ifrs-full_AuditorsRemunerationForAuditServices" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_EstimatedImpactOfNetProfitBeforeTaxDueToIncreaseOrDecreaseInExchangeRate_12f9647e-6afd-4575-808e-8a965e57f964_terseLabel_en-US" xlink:label="lab_gmab_EstimatedImpactOfNetProfitBeforeTaxDueToIncreaseOrDecreaseInExchangeRate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Estimated impact for net profit before tax due to increase or decrease In exchange rate</link:label>
    <link:label id="lab_gmab_EstimatedImpactOfNetProfitBeforeTaxDueToIncreaseOrDecreaseInExchangeRate_label_en-US" xlink:label="lab_gmab_EstimatedImpactOfNetProfitBeforeTaxDueToIncreaseOrDecreaseInExchangeRate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Estimated Impact of Net Profit Before Tax Due to Increase or Decrease In Exchange Rate</link:label>
    <link:label id="lab_gmab_EstimatedImpactOfNetProfitBeforeTaxDueToIncreaseOrDecreaseInExchangeRate_documentation_en-US" xlink:label="lab_gmab_EstimatedImpactOfNetProfitBeforeTaxDueToIncreaseOrDecreaseInExchangeRate" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The estimated impact for net profit before tax due to increase or decrease In exchange rate.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_EstimatedImpactOfNetProfitBeforeTaxDueToIncreaseOrDecreaseInExchangeRate" xlink:href="gmab-20251231.xsd#gmab_EstimatedImpactOfNetProfitBeforeTaxDueToIncreaseOrDecreaseInExchangeRate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_EstimatedImpactOfNetProfitBeforeTaxDueToIncreaseOrDecreaseInExchangeRate" xlink:to="lab_gmab_EstimatedImpactOfNetProfitBeforeTaxDueToIncreaseOrDecreaseInExchangeRate" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityAddressAddressLine1_019b0ccf-394f-7b61-b138-da5b69f0693e_terseLabel_en-US" xlink:label="lab_dei_EntityAddressAddressLine1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Address, Address Line One</link:label>
    <link:label id="lab_dei_EntityAddressAddressLine1_label_en-US" xlink:label="lab_dei_EntityAddressAddressLine1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Address, Address Line One</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressAddressLine1"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityAddressAddressLine1" xlink:to="lab_dei_EntityAddressAddressLine1" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_CostOfTreasurySharesAbstract_e699f227-c6fc-43a3-a69a-070c55ff92e4_terseLabel_en-US" xlink:label="lab_gmab_CostOfTreasurySharesAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cost (USD million)</link:label>
    <link:label id="lab_gmab_CostOfTreasurySharesAbstract_label_en-US" xlink:label="lab_gmab_CostOfTreasurySharesAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cost Of Treasury Shares [Abstract]</link:label>
    <link:label id="lab_gmab_CostOfTreasurySharesAbstract_documentation_en-US" xlink:label="lab_gmab_CostOfTreasurySharesAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">No definition available.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_CostOfTreasurySharesAbstract" xlink:href="gmab-20251231.xsd#gmab_CostOfTreasurySharesAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_CostOfTreasurySharesAbstract" xlink:to="lab_gmab_CostOfTreasurySharesAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_CollaborationAgreementsReceivables_e87dd4bf-96fa-4894-97c6-a894e6788612_terseLabel_en-US" xlink:label="lab_gmab_CollaborationAgreementsReceivables" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Receivables related to collaboration agreements</link:label>
    <link:label id="lab_gmab_CollaborationAgreementsReceivables_label_en-US" xlink:label="lab_gmab_CollaborationAgreementsReceivables" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Collaboration Agreements, Receivables</link:label>
    <link:label id="lab_gmab_CollaborationAgreementsReceivables_documentation_en-US" xlink:label="lab_gmab_CollaborationAgreementsReceivables" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The amount of receivables under collaboration agreement.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_CollaborationAgreementsReceivables" xlink:href="gmab-20251231.xsd#gmab_CollaborationAgreementsReceivables"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_CollaborationAgreementsReceivables" xlink:to="lab_gmab_CollaborationAgreementsReceivables" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_NumberOfWarrantsExercisable_8ef8b292-cffb-4f34-9114-f8a2cc3bbe1c_periodEndLabel_en-US" xlink:label="lab_gmab_NumberOfWarrantsExercisable" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Exercisable at year end (in shares)</link:label>
    <link:label id="lab_gmab_NumberOfWarrantsExercisable_label_en-US" xlink:label="lab_gmab_NumberOfWarrantsExercisable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number Of Warrants Exercisable</link:label>
    <link:label id="lab_gmab_NumberOfWarrantsExercisable_documentation_en-US" xlink:label="lab_gmab_NumberOfWarrantsExercisable" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Number of warrants exercisable at the end of year.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_NumberOfWarrantsExercisable" xlink:href="gmab-20251231.xsd#gmab_NumberOfWarrantsExercisable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_NumberOfWarrantsExercisable" xlink:to="lab_gmab_NumberOfWarrantsExercisable" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_StatementOfCashFlowsAbstract_label_en-US" xlink:label="lab_ifrs-full_StatementOfCashFlowsAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Statement of cash flows [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_StatementOfCashFlowsAbstract" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_StatementOfCashFlowsAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_StatementOfCashFlowsAbstract" xlink:to="lab_ifrs-full_StatementOfCashFlowsAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfFinancialAssetsTable_7cc4cbf6-0b3c-4964-94dd-3711ffe0b5cd_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfFinancialAssetsTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure of financial assets [table]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfFinancialAssetsTable_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfFinancialAssetsTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of financial assets [table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFinancialAssetsTable" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfFinancialAssetsTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable" xlink:to="lab_ifrs-full_DisclosureOfFinancialAssetsTable" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_TahamtanAhmadiMember_602dc0fc-1812-42a5-93c2-b858fc5290c0_terseLabel_en-US" xlink:label="lab_gmab_TahamtanAhmadiMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Tahamtan Ahmadi</link:label>
    <link:label id="lab_gmab_TahamtanAhmadiMember_label_en-US" xlink:label="lab_gmab_TahamtanAhmadiMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Tahamtan Ahmadi [Member]</link:label>
    <link:label id="lab_gmab_TahamtanAhmadiMember_documentation_en-US" xlink:label="lab_gmab_TahamtanAhmadiMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This member stands for Tahamtan Ahmadi.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_TahamtanAhmadiMember" xlink:href="gmab-20251231.xsd#gmab_TahamtanAhmadiMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_TahamtanAhmadiMember" xlink:to="lab_gmab_TahamtanAhmadiMember" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_BankDepositsIncludingShortTermMarketableSecurities_0af6b497-8c18-4cf0-8285-2f31b3d3235c_terseLabel_en-US" xlink:label="lab_gmab_BankDepositsIncludingShortTermMarketableSecurities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total value of bank deposits</link:label>
    <link:label id="lab_gmab_BankDepositsIncludingShortTermMarketableSecurities_label_en-US" xlink:label="lab_gmab_BankDepositsIncludingShortTermMarketableSecurities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Bank Deposits Including Short Term Marketable Securities</link:label>
    <link:label id="lab_gmab_BankDepositsIncludingShortTermMarketableSecurities_documentation_en-US" xlink:label="lab_gmab_BankDepositsIncludingShortTermMarketableSecurities" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The value of bank deposits including short-term marketable securities.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_BankDepositsIncludingShortTermMarketableSecurities" xlink:href="gmab-20251231.xsd#gmab_BankDepositsIncludingShortTermMarketableSecurities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_BankDepositsIncludingShortTermMarketableSecurities" xlink:to="lab_gmab_BankDepositsIncludingShortTermMarketableSecurities" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_GenmabK.k.Member_c5ca2c82-fec6-4fb9-972b-d2ed9e15c775_terseLabel_en-US" xlink:label="lab_gmab_GenmabK.k.Member" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Genmab K.K.</link:label>
    <link:label id="lab_gmab_GenmabK.k.Member_label_en-US" xlink:label="lab_gmab_GenmabK.k.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Genmab K.k. [Member]</link:label>
    <link:label id="lab_gmab_GenmabK.k.Member_documentation_en-US" xlink:label="lab_gmab_GenmabK.k.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This member stands for Genmab K.K.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_GenmabK.k.Member" xlink:href="gmab-20251231.xsd#gmab_GenmabK.k.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_GenmabK.k.Member" xlink:to="lab_gmab_GenmabK.k.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_PostemploymentBenefitExpenseDefinedBenefitPlans_3d9b0d80-01b9-459b-8c6e-a45b89f34faf_terseLabel_en-US" xlink:label="lab_ifrs-full_PostemploymentBenefitExpenseDefinedBenefitPlans" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Defined contribution plans</link:label>
    <link:label id="lab_ifrs-full_PostemploymentBenefitExpenseDefinedBenefitPlans_label_en-US" xlink:label="lab_ifrs-full_PostemploymentBenefitExpenseDefinedBenefitPlans" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Post-employment benefit expense in profit or loss, defined benefit plans</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PostemploymentBenefitExpenseDefinedBenefitPlans" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PostemploymentBenefitExpenseDefinedBenefitPlans"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_PostemploymentBenefitExpenseDefinedBenefitPlans" xlink:to="lab_ifrs-full_PostemploymentBenefitExpenseDefinedBenefitPlans" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_NumberOfInvestigationalMedicine_019bc6da-8042-74b2-b704-e0473d83a753_terseLabel_en-US" xlink:label="lab_gmab_NumberOfInvestigationalMedicine" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of investigational medicine</link:label>
    <link:label id="lab_gmab_NumberOfInvestigationalMedicine_label_en-US" xlink:label="lab_gmab_NumberOfInvestigationalMedicine" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number Of Investigational Medicine</link:label>
    <link:label id="lab_gmab_NumberOfInvestigationalMedicine_documentation_en-US" xlink:label="lab_gmab_NumberOfInvestigationalMedicine" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Number Of Investigational Medicine</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_NumberOfInvestigationalMedicine" xlink:href="gmab-20251231.xsd#gmab_NumberOfInvestigationalMedicine"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_NumberOfInvestigationalMedicine" xlink:to="lab_gmab_NumberOfInvestigationalMedicine" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_PercentageOfMarketableSecuritiesInvested_3903b1dc-3e35-4b19-8bd3-e102230f53b5_terseLabel_en-US" xlink:label="lab_gmab_PercentageOfMarketableSecuritiesInvested" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Marketable securities were invested (as a percent)</link:label>
    <link:label id="lab_gmab_PercentageOfMarketableSecuritiesInvested_label_en-US" xlink:label="lab_gmab_PercentageOfMarketableSecuritiesInvested" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Percentage of Marketable Securities Invested</link:label>
    <link:label id="lab_gmab_PercentageOfMarketableSecuritiesInvested_documentation_en-US" xlink:label="lab_gmab_PercentageOfMarketableSecuritiesInvested" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Percentage of marketable securities invested.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_PercentageOfMarketableSecuritiesInvested" xlink:href="gmab-20251231.xsd#gmab_PercentageOfMarketableSecuritiesInvested"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_PercentageOfMarketableSecuritiesInvested" xlink:to="lab_gmab_PercentageOfMarketableSecuritiesInvested" xlink:type="arc" order="1"/>
    <link:label id="lab_country_DK_f5e00b5f-baa5-4470-a735-2a6ebe886c0e_terseLabel_en-US" xlink:label="lab_country_DK" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Denmark</link:label>
    <link:label id="lab_country_DK_label_en-US" xlink:label="lab_country_DK" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">DENMARK</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_country_DK" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_DK"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_country_DK" xlink:to="lab_country_DK" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_RoyaltiesByProductAxis_afd7beed-7efb-401a-b903-60386a56c35e_terseLabel_en-US" xlink:label="lab_gmab_RoyaltiesByProductAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Royalties by Product [Axis]</link:label>
    <link:label id="lab_gmab_RoyaltiesByProductAxis_label_en-US" xlink:label="lab_gmab_RoyaltiesByProductAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Royalties by Product [Axis]</link:label>
    <link:label id="lab_gmab_RoyaltiesByProductAxis_documentation_en-US" xlink:label="lab_gmab_RoyaltiesByProductAxis" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Information by royalties by product.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_RoyaltiesByProductAxis" xlink:href="gmab-20251231.xsd#gmab_RoyaltiesByProductAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_RoyaltiesByProductAxis" xlink:to="lab_gmab_RoyaltiesByProductAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_DisclosureOfFairValueMeasurementOfAssetsLevel3ReconciliationTableTextBlock_f6727e15-bf8a-451f-9b07-02d94535dfe1_terseLabel_en-US" xlink:label="lab_gmab_DisclosureOfFairValueMeasurementOfAssetsLevel3ReconciliationTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of level 3 reconciliation of assets</link:label>
    <link:label id="lab_gmab_DisclosureOfFairValueMeasurementOfAssetsLevel3ReconciliationTableTextBlock_label_en-US" xlink:label="lab_gmab_DisclosureOfFairValueMeasurementOfAssetsLevel3ReconciliationTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure Of Fair Value Measurement Of Assets, Level 3 Reconciliation [Table Text Block]</link:label>
    <link:label id="lab_gmab_DisclosureOfFairValueMeasurementOfAssetsLevel3ReconciliationTableTextBlock_documentation_en-US" xlink:label="lab_gmab_DisclosureOfFairValueMeasurementOfAssetsLevel3ReconciliationTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Tabular disclosure of level 3 reconciliation of assets measured at fair value.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_DisclosureOfFairValueMeasurementOfAssetsLevel3ReconciliationTableTextBlock" xlink:href="gmab-20251231.xsd#gmab_DisclosureOfFairValueMeasurementOfAssetsLevel3ReconciliationTableTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_DisclosureOfFairValueMeasurementOfAssetsLevel3ReconciliationTableTextBlock" xlink:to="lab_gmab_DisclosureOfFairValueMeasurementOfAssetsLevel3ReconciliationTableTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_InvestmentAccountedForUsingEquityMethod_c2617ee8-70b9-45e9-929a-903a2ed99571_verboseLabel_en-US" xlink:label="lab_ifrs-full_InvestmentAccountedForUsingEquityMethod" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Other investments</link:label>
    <link:label id="lab_ifrs-full_InvestmentAccountedForUsingEquityMethod_label_en-US" xlink:label="lab_ifrs-full_InvestmentAccountedForUsingEquityMethod" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Investments accounted for using equity method</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InvestmentAccountedForUsingEquityMethod" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_InvestmentAccountedForUsingEquityMethod"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_InvestmentAccountedForUsingEquityMethod" xlink:to="lab_ifrs-full_InvestmentAccountedForUsingEquityMethod" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_InvestmentFundsMember_81d46b45-5839-4760-bd2c-1655b361b227_terseLabel_en-US" xlink:label="lab_ifrs-full_InvestmentFundsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fund investments</link:label>
    <link:label id="lab_ifrs-full_InvestmentFundsMember_label_en-US" xlink:label="lab_ifrs-full_InvestmentFundsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Investment funds [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InvestmentFundsMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_InvestmentFundsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_InvestmentFundsMember" xlink:to="lab_ifrs-full_InvestmentFundsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfFairValueMeasurementOfAssetsLineItems_5badf191-8cfc-460f-9581-f090117671f5_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfFairValueMeasurementOfAssetsLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure of fair value measurement of assets [line items]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfFairValueMeasurementOfAssetsLineItems_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfFairValueMeasurementOfAssetsLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of fair value measurement of assets [line items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFairValueMeasurementOfAssetsLineItems" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfFairValueMeasurementOfAssetsLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfFairValueMeasurementOfAssetsLineItems" xlink:to="lab_ifrs-full_DisclosureOfFairValueMeasurementOfAssetsLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_WarrantVestingPeriod_c04eca3b-3261-498d-ab03-4f78ba0d25df_terseLabel_en-US" xlink:label="lab_gmab_WarrantVestingPeriod" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Warrant vesting period</link:label>
    <link:label id="lab_gmab_WarrantVestingPeriod_label_en-US" xlink:label="lab_gmab_WarrantVestingPeriod" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Warrant Vesting Period</link:label>
    <link:label id="lab_gmab_WarrantVestingPeriod_documentation_en-US" xlink:label="lab_gmab_WarrantVestingPeriod" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Period which the right to exercise an warrant is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_WarrantVestingPeriod" xlink:href="gmab-20251231.xsd#gmab_WarrantVestingPeriod"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_WarrantVestingPeriod" xlink:to="lab_gmab_WarrantVestingPeriod" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AmortisationExpense_69b3eed2-b15a-4ff7-8079-e6bea4ac2a16_terseLabel_en-US" xlink:label="lab_ifrs-full_AmortisationExpense" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Amortization expense</link:label>
    <link:label id="lab_ifrs-full_AmortisationExpense_label_en-US" xlink:label="lab_ifrs-full_AmortisationExpense" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Amortisation expense</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AmortisationExpense" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AmortisationExpense"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AmortisationExpense" xlink:to="lab_ifrs-full_AmortisationExpense" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_OtherComprehensiveIncomeAbstract_da556b93-f3f7-4667-8592-6136abaeb92a_terseLabel_en-US" xlink:label="lab_ifrs-full_OtherComprehensiveIncomeAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other comprehensive income:</link:label>
    <link:label id="lab_ifrs-full_OtherComprehensiveIncomeAbstract_label_en-US" xlink:label="lab_ifrs-full_OtherComprehensiveIncomeAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other comprehensive income [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherComprehensiveIncomeAbstract" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherComprehensiveIncomeAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OtherComprehensiveIncomeAbstract" xlink:to="lab_ifrs-full_OtherComprehensiveIncomeAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_AdditionsIntangibleAssetsAndGoodwill_019c515b-9b60-71e8-91a4-cd5359c4af71_terseLabel_en-US" xlink:label="lab_gmab_AdditionsIntangibleAssetsAndGoodwill" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Additions for the year</link:label>
    <link:label id="lab_gmab_AdditionsIntangibleAssetsAndGoodwill_label_en-US" xlink:label="lab_gmab_AdditionsIntangibleAssetsAndGoodwill" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Additions, Intangible Assets And Goodwill</link:label>
    <link:label id="lab_gmab_AdditionsIntangibleAssetsAndGoodwill_documentation_en-US" xlink:label="lab_gmab_AdditionsIntangibleAssetsAndGoodwill" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Additions, Intangible Assets And Goodwill</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_AdditionsIntangibleAssetsAndGoodwill" xlink:href="gmab-20251231.xsd#gmab_AdditionsIntangibleAssetsAndGoodwill"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_AdditionsIntangibleAssetsAndGoodwill" xlink:to="lab_gmab_AdditionsIntangibleAssetsAndGoodwill" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ClassesOfShareCapitalDomain_019b8ee4-73f9-7bfb-abe9-f0194cbfbafc_terseLabel_en-US" xlink:label="lab_ifrs-full_ClassesOfShareCapitalDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Classes of share capital [domain]</link:label>
    <link:label id="lab_ifrs-full_ClassesOfShareCapitalDomain_label_en-US" xlink:label="lab_ifrs-full_ClassesOfShareCapitalDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Classes of share capital [domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfShareCapitalDomain" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfShareCapitalDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ClassesOfShareCapitalDomain" xlink:to="lab_ifrs-full_ClassesOfShareCapitalDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AdjustmentsForDeferredTaxOfPriorPeriods_b5e52649-3edd-4df7-935a-3cb2111def74_terseLabel_en-US" xlink:label="lab_ifrs-full_AdjustmentsForDeferredTaxOfPriorPeriods" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Adjustment to deferred tax</link:label>
    <link:label id="lab_ifrs-full_AdjustmentsForDeferredTaxOfPriorPeriods_label_en-US" xlink:label="lab_ifrs-full_AdjustmentsForDeferredTaxOfPriorPeriods" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Adjustments for deferred tax of prior periods</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForDeferredTaxOfPriorPeriods" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AdjustmentsForDeferredTaxOfPriorPeriods"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AdjustmentsForDeferredTaxOfPriorPeriods" xlink:to="lab_ifrs-full_AdjustmentsForDeferredTaxOfPriorPeriods" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementExplanatory_019b2c85-8a7f-7f23-84ff-07a686d14f34_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Summary of terms and conditions of share-based payment arrangement</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of terms and conditions of share-based payment arrangement [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementExplanatory" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementExplanatory" xlink:to="lab_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_country_CN_755f3137-0719-462d-b5de-cccabc93cc71_terseLabel_en-US" xlink:label="lab_country_CN" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">China</link:label>
    <link:label id="lab_country_CN_label_en-US" xlink:label="lab_country_CN" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">CHINA</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_country_CN" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_CN"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_country_CN" xlink:to="lab_country_CN" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_Prepayments_83d9697d-ed00-4259-b8f9-41357038af33_terseLabel_en-US" xlink:label="lab_ifrs-full_Prepayments" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Prepayments</link:label>
    <link:label id="lab_ifrs-full_Prepayments_label_en-US" xlink:label="lab_ifrs-full_Prepayments" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Prepayments</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Prepayments" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Prepayments"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_Prepayments" xlink:to="lab_ifrs-full_Prepayments" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ClassesOfContingentLiabilitiesDomain_c0148daf-c5ad-4f91-ba0f-9a8c154f6e7d_terseLabel_en-US" xlink:label="lab_ifrs-full_ClassesOfContingentLiabilitiesDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Classes of contingent liabilities [domain]</link:label>
    <link:label id="lab_ifrs-full_ClassesOfContingentLiabilitiesDomain_label_en-US" xlink:label="lab_ifrs-full_ClassesOfContingentLiabilitiesDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Classes of contingent liabilities [domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfContingentLiabilitiesDomain" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfContingentLiabilitiesDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ClassesOfContingentLiabilitiesDomain" xlink:to="lab_ifrs-full_ClassesOfContingentLiabilitiesDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_PurchaseOfInterestsInInvestmentsAccountedForUsingEquityMethod_6ae69194-1bc1-4b38-8ac5-5b3574c3d0f6_negatedLabel_en-US" xlink:label="lab_ifrs-full_PurchaseOfInterestsInInvestmentsAccountedForUsingEquityMethod" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Other investments bought</link:label>
    <link:label id="lab_ifrs-full_PurchaseOfInterestsInInvestmentsAccountedForUsingEquityMethod_label_en-US" xlink:label="lab_ifrs-full_PurchaseOfInterestsInInvestmentsAccountedForUsingEquityMethod" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Purchase of interests in investments accounted for using equity method</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PurchaseOfInterestsInInvestmentsAccountedForUsingEquityMethod" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PurchaseOfInterestsInInvestmentsAccountedForUsingEquityMethod"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_PurchaseOfInterestsInInvestmentsAccountedForUsingEquityMethod" xlink:to="lab_ifrs-full_PurchaseOfInterestsInInvestmentsAccountedForUsingEquityMethod" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_FinanceIncome_b2f19ce3-ceff-4f94-8479-d1841e1af732_terseLabel_en-US" xlink:label="lab_ifrs-full_FinanceIncome" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Financial income</link:label>
    <link:label id="lab_ifrs-full_FinanceIncome_8fd6a46e-ba56-40de-8771-4f1f25c32752_totalLabel_en-US" xlink:label="lab_ifrs-full_FinanceIncome" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total financial income</link:label>
    <link:label id="lab_ifrs-full_FinanceIncome_label_en-US" xlink:label="lab_ifrs-full_FinanceIncome" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance income</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinanceIncome" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinanceIncome"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_FinanceIncome" xlink:to="lab_ifrs-full_FinanceIncome" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ClassesOfFinancialLiabilitiesAxis_fc51c293-8a00-4e20-a399-5a267455f7a5_terseLabel_en-US" xlink:label="lab_ifrs-full_ClassesOfFinancialLiabilitiesAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Classes of financial liabilities [axis]</link:label>
    <link:label id="lab_ifrs-full_ClassesOfFinancialLiabilitiesAxis_label_en-US" xlink:label="lab_ifrs-full_ClassesOfFinancialLiabilitiesAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Classes of financial liabilities [axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialLiabilitiesAxis" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialLiabilitiesAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ClassesOfFinancialLiabilitiesAxis" xlink:to="lab_ifrs-full_ClassesOfFinancialLiabilitiesAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ClassesOfFinancialLiabilitiesDomain_63721855-1382-4cbd-a840-aee3a1ada17d_terseLabel_en-US" xlink:label="lab_ifrs-full_ClassesOfFinancialLiabilitiesDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Classes of financial liabilities [domain]</link:label>
    <link:label id="lab_ifrs-full_ClassesOfFinancialLiabilitiesDomain_label_en-US" xlink:label="lab_ifrs-full_ClassesOfFinancialLiabilitiesDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Classes of financial liabilities [domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialLiabilitiesDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain" xlink:to="lab_ifrs-full_ClassesOfFinancialLiabilitiesDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_DocumentShellCompanyReport_019b0ccd-3b85-7448-aa1d-933957c2aa41_terseLabel_en-US" xlink:label="lab_dei_DocumentShellCompanyReport" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Document Shell Company Report</link:label>
    <link:label id="lab_dei_DocumentShellCompanyReport_label_en-US" xlink:label="lab_dei_DocumentShellCompanyReport" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Document Shell Company Report</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentShellCompanyReport" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentShellCompanyReport"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_DocumentShellCompanyReport" xlink:to="lab_dei_DocumentShellCompanyReport" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AdditionsToRightofuseAssets_efee2269-ccc7-4fc5-b01f-f7c0d2ea7d71_terseLabel_en-US" xlink:label="lab_ifrs-full_AdditionsToRightofuseAssets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Additions to right-of-use assets</link:label>
    <link:label id="lab_ifrs-full_AdditionsToRightofuseAssets_label_en-US" xlink:label="lab_ifrs-full_AdditionsToRightofuseAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Additions to right-of-use assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdditionsToRightofuseAssets" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AdditionsToRightofuseAssets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AdditionsToRightofuseAssets" xlink:to="lab_ifrs-full_AdditionsToRightofuseAssets" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CashFlowsUsedInObtainingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities_bc7c171d-d3fb-4204-baca-43ab5fbddf55_negatedLabel_en-US" xlink:label="lab_ifrs-full_CashFlowsUsedInObtainingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Acquisition of business, net of cash acquired</link:label>
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    <link:label id="lab_ifrs-full_CashFlowsUsedInObtainingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities_label_en-US" xlink:label="lab_ifrs-full_CashFlowsUsedInObtainingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities</link:label>
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    <link:label id="lab_gmab_NumberOfWarrantsExpired_84307a3d-0831-42f7-a004-5057d85809e5_negatedLabel_en-US" xlink:label="lab_gmab_NumberOfWarrantsExpired" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Expired (in shares)</link:label>
    <link:label id="lab_gmab_NumberOfWarrantsExpired_label_en-US" xlink:label="lab_gmab_NumberOfWarrantsExpired" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number Of Warrants Expired</link:label>
    <link:label id="lab_gmab_NumberOfWarrantsExpired_documentation_en-US" xlink:label="lab_gmab_NumberOfWarrantsExpired" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Number of warrants expired.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_NumberOfWarrantsExpired" xlink:href="gmab-20251231.xsd#gmab_NumberOfWarrantsExpired"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_NumberOfWarrantsExpired" xlink:to="lab_gmab_NumberOfWarrantsExpired" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AverageNumberOfEmployees_5845de2a-133b-4447-8936-bf4bbacaf084_terseLabel_en-US" xlink:label="lab_ifrs-full_AverageNumberOfEmployees" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Average number of FTE</link:label>
    <link:label id="lab_ifrs-full_AverageNumberOfEmployees_label_en-US" xlink:label="lab_ifrs-full_AverageNumberOfEmployees" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Average number of employees</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AverageNumberOfEmployees" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AverageNumberOfEmployees"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AverageNumberOfEmployees" xlink:to="lab_ifrs-full_AverageNumberOfEmployees" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_AbbVieMember_1d1eea74-1de8-4854-9832-3a537466e9e0_terseLabel_en-US" xlink:label="lab_gmab_AbbVieMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">AbbVie</link:label>
    <link:label id="lab_gmab_AbbVieMember_label_en-US" xlink:label="lab_gmab_AbbVieMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">AbbVie [Member]</link:label>
    <link:label id="lab_gmab_AbbVieMember_documentation_en-US" xlink:label="lab_gmab_AbbVieMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This member stands for collaboration arrangement with Abbvie.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_AbbVieMember" xlink:href="gmab-20251231.xsd#gmab_AbbVieMember"/>
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    <link:label id="lab_gmab_OtherNonCurrentAssetsRecognisedAsOfAcquisitionDate_1da0f06e-85fa-4a6a-bc87-46ec346f6177_terseLabel_en-US" xlink:label="lab_gmab_OtherNonCurrentAssetsRecognisedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other non-current assets</link:label>
    <link:label id="lab_gmab_OtherNonCurrentAssetsRecognisedAsOfAcquisitionDate_label_en-US" xlink:label="lab_gmab_OtherNonCurrentAssetsRecognisedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Non-Current Assets Recognised As Of Acquisition Date</link:label>
    <link:label id="lab_gmab_OtherNonCurrentAssetsRecognisedAsOfAcquisitionDate_documentation_en-US" xlink:label="lab_gmab_OtherNonCurrentAssetsRecognisedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The amount recognised as of the acquisition date for other non-current assets acquired in a business combination.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_OtherNonCurrentAssetsRecognisedAsOfAcquisitionDate" xlink:href="gmab-20251231.xsd#gmab_OtherNonCurrentAssetsRecognisedAsOfAcquisitionDate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_OtherNonCurrentAssetsRecognisedAsOfAcquisitionDate" xlink:to="lab_gmab_OtherNonCurrentAssetsRecognisedAsOfAcquisitionDate" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_UndiscountedOperatingLeasePaymentsToBeReceived_c5711d3b-c6cc-42b3-9c16-317b21f49d40_terseLabel_en-US" xlink:label="lab_ifrs-full_UndiscountedOperatingLeasePaymentsToBeReceived" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Future minimum payments under our leases</link:label>
    <link:label id="lab_ifrs-full_UndiscountedOperatingLeasePaymentsToBeReceived_label_en-US" xlink:label="lab_ifrs-full_UndiscountedOperatingLeasePaymentsToBeReceived" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Undiscounted operating lease payments to be received</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_UndiscountedOperatingLeasePaymentsToBeReceived" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_UndiscountedOperatingLeasePaymentsToBeReceived"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_UndiscountedOperatingLeasePaymentsToBeReceived" xlink:to="lab_ifrs-full_UndiscountedOperatingLeasePaymentsToBeReceived" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_LeaseLiabilities_c2f080da-6501-4e19-91cc-94cc190dae6e_totalLabel_en-US" xlink:label="lab_ifrs-full_LeaseLiabilities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total lease liabilities</link:label>
    <link:label id="lab_ifrs-full_LeaseLiabilities_label_en-US" xlink:label="lab_ifrs-full_LeaseLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lease liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LeaseLiabilities" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LeaseLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_LeaseLiabilities" xlink:to="lab_ifrs-full_LeaseLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_NumberOfVotes_07e75a92-c3de-47e3-92b8-3e56ce9b96ea_terseLabel_en-US" xlink:label="lab_gmab_NumberOfVotes" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of votes</link:label>
    <link:label id="lab_gmab_NumberOfVotes_label_en-US" xlink:label="lab_gmab_NumberOfVotes" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number Of Votes</link:label>
    <link:label id="lab_gmab_NumberOfVotes_documentation_en-US" xlink:label="lab_gmab_NumberOfVotes" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Number of votes.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_NumberOfVotes" xlink:href="gmab-20251231.xsd#gmab_NumberOfVotes"/>
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    <link:label id="lab_gmab_ResearchAndDevelopmentMember_019be51d-1fc9-7f98-a15c-65b939b5c173_terseLabel_en-US" xlink:label="lab_gmab_ResearchAndDevelopmentMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Research and development expenses</link:label>
    <link:label id="lab_gmab_ResearchAndDevelopmentMember_label_en-US" xlink:label="lab_gmab_ResearchAndDevelopmentMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Research And Development [Member]</link:label>
    <link:label id="lab_gmab_ResearchAndDevelopmentMember_documentation_en-US" xlink:label="lab_gmab_ResearchAndDevelopmentMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Research And Development</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_ResearchAndDevelopmentMember" xlink:href="gmab-20251231.xsd#gmab_ResearchAndDevelopmentMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_ResearchAndDevelopmentMember" xlink:to="lab_gmab_ResearchAndDevelopmentMember" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_AuditInformationAbstract_label_en-US" xlink:label="lab_gmab_AuditInformationAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Audit Information [Abstract]</link:label>
    <link:label id="lab_gmab_AuditInformationAbstract_documentation_en-US" xlink:label="lab_gmab_AuditInformationAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Audit Information</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_AuditInformationAbstract" xlink:href="gmab-20251231.xsd#gmab_AuditInformationAbstract"/>
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    <link:label id="lab_gmab_PercentageOfReductionInShareCapital_019c5102-e67c-7b47-9101-946cdc7d9f55_negatedTerseLabel_en-US" xlink:label="lab_gmab_PercentageOfReductionInShareCapital" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Proportion of reduction in share capital (in %)</link:label>
    <link:label id="lab_gmab_PercentageOfReductionInShareCapital_label_en-US" xlink:label="lab_gmab_PercentageOfReductionInShareCapital" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Percentage Of Reduction In Share Capital</link:label>
    <link:label id="lab_gmab_PercentageOfReductionInShareCapital_documentation_en-US" xlink:label="lab_gmab_PercentageOfReductionInShareCapital" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Percentage Of Reduction In Share Capital</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_PercentageOfReductionInShareCapital" xlink:href="gmab-20251231.xsd#gmab_PercentageOfReductionInShareCapital"/>
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    <link:label id="lab_gmab_GenmabBeijingCo.Ltd.Member_36bd9948-45af-427b-b275-66147e886f6a_terseLabel_en-US" xlink:label="lab_gmab_GenmabBeijingCo.Ltd.Member" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Genmab (Beijing) Co., Ltd.</link:label>
    <link:label id="lab_gmab_GenmabBeijingCo.Ltd.Member_label_en-US" xlink:label="lab_gmab_GenmabBeijingCo.Ltd.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Genmab (Beijing ) Co., Ltd. [Member]</link:label>
    <link:label id="lab_gmab_GenmabBeijingCo.Ltd.Member_documentation_en-US" xlink:label="lab_gmab_GenmabBeijingCo.Ltd.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"></link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_GenmabBeijingCo.Ltd.Member" xlink:href="gmab-20251231.xsd#gmab_GenmabBeijingCo.Ltd.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_GenmabBeijingCo.Ltd.Member" xlink:to="lab_gmab_GenmabBeijingCo.Ltd.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_srt_MinimumMember_019c51fe-1b37-7c44-93a0-f6b918778250_terseLabel_en-US" xlink:label="lab_srt_MinimumMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Minimum</link:label>
    <link:label id="lab_srt_MinimumMember_label_en-US" xlink:label="lab_srt_MinimumMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Minimum [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_MinimumMember" xlink:to="lab_srt_MinimumMember" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_CollaborationsAgreementCostAndProfitSharingRatio_3b3c0d6b-972b-47e9-9f10-3664b8380341_terseLabel_en-US" xlink:label="lab_gmab_CollaborationsAgreementCostAndProfitSharingRatio" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cost and profit sharing ratio</link:label>
    <link:label id="lab_gmab_CollaborationsAgreementCostAndProfitSharingRatio_label_en-US" xlink:label="lab_gmab_CollaborationsAgreementCostAndProfitSharingRatio" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Collaborations Agreement, Cost And Profit Sharing Ratio</link:label>
    <link:label id="lab_gmab_CollaborationsAgreementCostAndProfitSharingRatio_documentation_en-US" xlink:label="lab_gmab_CollaborationsAgreementCostAndProfitSharingRatio" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the cost and profit sharing ratio.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_CollaborationsAgreementCostAndProfitSharingRatio" xlink:href="gmab-20251231.xsd#gmab_CollaborationsAgreementCostAndProfitSharingRatio"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_CollaborationsAgreementCostAndProfitSharingRatio" xlink:to="lab_gmab_CollaborationsAgreementCostAndProfitSharingRatio" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfNumberAndWeightedAverageExercisePricesOfOtherEquityInstrumentsExplanatory_4626afce-8b79-44aa-8fed-9faab040cc8e_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfNumberAndWeightedAverageExercisePricesOfOtherEquityInstrumentsExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Summary of RSUs activity</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfNumberAndWeightedAverageExercisePricesOfOtherEquityInstrumentsExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfNumberAndWeightedAverageExercisePricesOfOtherEquityInstrumentsExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of number and weighted average exercise prices of other equity instruments [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfNumberAndWeightedAverageExercisePricesOfOtherEquityInstrumentsExplanatory" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfNumberAndWeightedAverageExercisePricesOfOtherEquityInstrumentsExplanatory"/>
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    <link:label id="lab_ifrs-full_PurchasesFairValueMeasurementAssets_d7f5fc75-8d84-4b04-b878-96a967616aef_terseLabel_en-US" xlink:label="lab_ifrs-full_PurchasesFairValueMeasurementAssets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Acquisitions</link:label>
    <link:label id="lab_ifrs-full_PurchasesFairValueMeasurementAssets_label_en-US" xlink:label="lab_ifrs-full_PurchasesFairValueMeasurementAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Purchases, fair value measurement, assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PurchasesFairValueMeasurementAssets" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PurchasesFairValueMeasurementAssets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_PurchasesFairValueMeasurementAssets" xlink:to="lab_ifrs-full_PurchasesFairValueMeasurementAssets" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForTradeAndOtherReceivablesExplanatory_019bbc22-f98b-7510-91b5-ac5e1367eaf5_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForTradeAndOtherReceivablesExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Receivables</link:label>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForTradeAndOtherReceivablesExplanatory_label_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForTradeAndOtherReceivablesExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Description of accounting policy for trade and other receivables [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForTradeAndOtherReceivablesExplanatory" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DescriptionOfAccountingPolicyForTradeAndOtherReceivablesExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DescriptionOfAccountingPolicyForTradeAndOtherReceivablesExplanatory" xlink:to="lab_ifrs-full_DescriptionOfAccountingPolicyForTradeAndOtherReceivablesExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfMaturityAnalysisOfOperatingLeasePaymentsAbstract_78d6d65e-70d9-46d0-8a79-18ca05a95b00_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfMaturityAnalysisOfOperatingLeasePaymentsAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure of maturity analysis of operating lease payments [abstract]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfMaturityAnalysisOfOperatingLeasePaymentsAbstract_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfMaturityAnalysisOfOperatingLeasePaymentsAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of maturity analysis of operating lease payments [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfMaturityAnalysisOfOperatingLeasePaymentsAbstract" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfMaturityAnalysisOfOperatingLeasePaymentsAbstract"/>
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    <link:label id="lab_ifrs-full_IssuedCapital_a14ed8ff-25e2-4ed0-a0ec-a389999da284_terseLabel_en-US" xlink:label="lab_ifrs-full_IssuedCapital" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share capital</link:label>
    <link:label id="lab_ifrs-full_IssuedCapital_e2284b11-3894-43b5-a5e6-5f1abb02792b_periodStartLabel_en-US" xlink:label="lab_ifrs-full_IssuedCapital" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Share capital, at beginning of period</link:label>
    <link:label id="lab_ifrs-full_IssuedCapital_05fa951b-66f4-4c56-80d8-b506e4321ac9_periodEndLabel_en-US" xlink:label="lab_ifrs-full_IssuedCapital" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Share capital, at end of period</link:label>
    <link:label id="lab_ifrs-full_IssuedCapital_label_en-US" xlink:label="lab_ifrs-full_IssuedCapital" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Issued capital</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IssuedCapital" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IssuedCapital"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_IssuedCapital" xlink:to="lab_ifrs-full_IssuedCapital" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_UnusedTaxLossesForWhichNoDeferredTaxAssetRecognised_d4bf5424-9ac5-461f-9c4f-0072a4f4ea9b_verboseLabel_en-US" xlink:label="lab_ifrs-full_UnusedTaxLossesForWhichNoDeferredTaxAssetRecognised" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Gross unrecognized tax loss carryforwards</link:label>
    <link:label id="lab_ifrs-full_UnusedTaxLossesForWhichNoDeferredTaxAssetRecognised_label_en-US" xlink:label="lab_ifrs-full_UnusedTaxLossesForWhichNoDeferredTaxAssetRecognised" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Unused tax losses for which no deferred tax asset recognised</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_UnusedTaxLossesForWhichNoDeferredTaxAssetRecognised" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_UnusedTaxLossesForWhichNoDeferredTaxAssetRecognised"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_UnusedTaxLossesForWhichNoDeferredTaxAssetRecognised" xlink:to="lab_ifrs-full_UnusedTaxLossesForWhichNoDeferredTaxAssetRecognised" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_CollaborativeArrangementAndArrangementOtherThanCollaborativeDomain_773b3a47-dc45-4878-a7bc-7ed66bdd67da_terseLabel_en-US" xlink:label="lab_gmab_CollaborativeArrangementAndArrangementOtherThanCollaborativeDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Collaborative Arrangement and Arrangement Other Than Collaborative [Domain]</link:label>
    <link:label id="lab_gmab_CollaborativeArrangementAndArrangementOtherThanCollaborativeDomain_label_en-US" xlink:label="lab_gmab_CollaborativeArrangementAndArrangementOtherThanCollaborativeDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Collaborative Arrangement and Arrangement Other Than Collaborative [Domain]</link:label>
    <link:label id="lab_gmab_CollaborativeArrangementAndArrangementOtherThanCollaborativeDomain_documentation_en-US" xlink:label="lab_gmab_CollaborativeArrangementAndArrangementOtherThanCollaborativeDomain" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Collaborative arrangement and arrangement other than collaborative applicable to revenue-generating activity or operations.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_CollaborativeArrangementAndArrangementOtherThanCollaborativeDomain" xlink:href="gmab-20251231.xsd#gmab_CollaborativeArrangementAndArrangementOtherThanCollaborativeDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_CollaborativeArrangementAndArrangementOtherThanCollaborativeDomain" xlink:to="lab_gmab_CollaborativeArrangementAndArrangementOtherThanCollaborativeDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CategoriesOfFinancialAssetsAxis_5b60512b-ce67-4de6-8835-c58ce74c775f_terseLabel_en-US" xlink:label="lab_ifrs-full_CategoriesOfFinancialAssetsAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Categories of financial assets [axis]</link:label>
    <link:label id="lab_ifrs-full_CategoriesOfFinancialAssetsAxis_label_en-US" xlink:label="lab_ifrs-full_CategoriesOfFinancialAssetsAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Categories of financial assets [axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialAssetsAxis" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialAssetsAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CategoriesOfFinancialAssetsAxis" xlink:to="lab_ifrs-full_CategoriesOfFinancialAssetsAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_NumberOfSharesOutstanding_4a148a34-4a34-4a1c-b23e-b03eeef64cc8_periodStartLabel_en-US" xlink:label="lab_ifrs-full_NumberOfSharesOutstanding" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Number of shares, at beginning of period</link:label>
    <link:label id="lab_ifrs-full_NumberOfSharesOutstanding_65d11bb1-214e-462b-9387-e9d6375fb35b_periodEndLabel_en-US" xlink:label="lab_ifrs-full_NumberOfSharesOutstanding" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Number of shares, at end of period</link:label>
    <link:label id="lab_ifrs-full_NumberOfSharesOutstanding_label_en-US" xlink:label="lab_ifrs-full_NumberOfSharesOutstanding" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number of shares outstanding</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfSharesOutstanding" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfSharesOutstanding"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_NumberOfSharesOutstanding" xlink:to="lab_ifrs-full_NumberOfSharesOutstanding" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_CurrentStatedAfterChangesInAccountingPolicyMember_019c5298-6df3-7761-9cb8-d30d666520b9_terseLabel_en-US" xlink:label="lab_gmab_CurrentStatedAfterChangesInAccountingPolicyMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Current stated</link:label>
    <link:label id="lab_gmab_CurrentStatedAfterChangesInAccountingPolicyMember_label_en-US" xlink:label="lab_gmab_CurrentStatedAfterChangesInAccountingPolicyMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Current Stated After Changes In Accounting Policy [Member]</link:label>
    <link:label id="lab_gmab_CurrentStatedAfterChangesInAccountingPolicyMember_documentation_en-US" xlink:label="lab_gmab_CurrentStatedAfterChangesInAccountingPolicyMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Current Stated After Changes In Accounting Policy</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_CurrentStatedAfterChangesInAccountingPolicyMember" xlink:href="gmab-20251231.xsd#gmab_CurrentStatedAfterChangesInAccountingPolicyMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_CurrentStatedAfterChangesInAccountingPolicyMember" xlink:to="lab_gmab_CurrentStatedAfterChangesInAccountingPolicyMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_OtherProvisions_3a46dbf2-3190-4b07-a703-f147413d64ab_terseLabel_en-US" xlink:label="lab_ifrs-full_OtherProvisions" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Amount of provision recorded</link:label>
    <link:label id="lab_ifrs-full_OtherProvisions_label_en-US" xlink:label="lab_ifrs-full_OtherProvisions" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other provisions</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherProvisions" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherProvisions"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OtherProvisions" xlink:to="lab_ifrs-full_OtherProvisions" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_ExecutiveManagementMember_019bb402-73f8-7e19-a33e-c029f14366f8_verboseLabel_en-US" xlink:label="lab_gmab_ExecutiveManagementMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Executive Management</link:label>
    <link:label id="lab_gmab_ExecutiveManagementMember_74fa3eb6-b73f-4dcc-9fc9-505dd22ab51e_terseLabel_en-US" xlink:label="lab_gmab_ExecutiveManagementMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total</link:label>
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    <link:label id="lab_gmab_ExecutiveManagementMember_documentation_en-US" xlink:label="lab_gmab_ExecutiveManagementMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents information pertaining to executive management.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_ExecutiveManagementMember" xlink:href="gmab-20251231.xsd#gmab_ExecutiveManagementMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_ExecutiveManagementMember" xlink:to="lab_gmab_ExecutiveManagementMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_FinancialLiabilities_74358c37-fb4f-4ce5-807c-d8971f311a85_negatedLabel_en-US" xlink:label="lab_ifrs-full_FinancialLiabilities" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Financial liabilities</link:label>
    <link:label id="lab_ifrs-full_FinancialLiabilities_label_en-US" xlink:label="lab_ifrs-full_FinancialLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Financial liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialLiabilities" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_FinancialLiabilities" xlink:to="lab_ifrs-full_FinancialLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_OtherTemporaryDifferencesMember_0b08cd2a-59a1-4592-b4ce-b3e06fd938d5_terseLabel_en-US" xlink:label="lab_ifrs-full_OtherTemporaryDifferencesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other temporary differences</link:label>
    <link:label id="lab_ifrs-full_OtherTemporaryDifferencesMember_label_en-US" xlink:label="lab_ifrs-full_OtherTemporaryDifferencesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other temporary differences [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherTemporaryDifferencesMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherTemporaryDifferencesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OtherTemporaryDifferencesMember" xlink:to="lab_ifrs-full_OtherTemporaryDifferencesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_LossesOnOtherInvestmentsNet_019b082f-e448-77d1-9fbd-5f6e25ceb89f_negatedTerseLabel_en-US" xlink:label="lab_gmab_LossesOnOtherInvestmentsNet" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Loss on other investments, net</link:label>
    <link:label id="lab_gmab_LossesOnOtherInvestmentsNet_019ba1ea-9c0e-76ec-87ce-4af36bda985d_negatedLabel_en-US" xlink:label="lab_gmab_LossesOnOtherInvestmentsNet" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Loss on other investments, net</link:label>
    <link:label id="lab_gmab_LossesOnOtherInvestmentsNet_label_en-US" xlink:label="lab_gmab_LossesOnOtherInvestmentsNet" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Losses On Other Investments, Net</link:label>
    <link:label id="lab_gmab_LossesOnOtherInvestmentsNet_documentation_en-US" xlink:label="lab_gmab_LossesOnOtherInvestmentsNet" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Losses On Other Investments, Net</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_LossesOnOtherInvestmentsNet" xlink:href="gmab-20251231.xsd#gmab_LossesOnOtherInvestmentsNet"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_LossesOnOtherInvestmentsNet" xlink:to="lab_gmab_LossesOnOtherInvestmentsNet" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_IncomeTaxExpenseContinuingOperations_f760a91b-827e-4053-ae9a-4b9e8b450fcd_negatedLabel_en-US" xlink:label="lab_ifrs-full_IncomeTaxExpenseContinuingOperations" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Corporate tax</link:label>
    <link:label id="lab_ifrs-full_IncomeTaxExpenseContinuingOperations_c75e1f91-d1d2-496a-8ef3-46cf6d499efe_totalLabel_en-US" xlink:label="lab_ifrs-full_IncomeTaxExpenseContinuingOperations" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total tax for the period in the income statement</link:label>
    <link:label id="lab_ifrs-full_IncomeTaxExpenseContinuingOperations_7cd8ad67-24a2-4367-bb5d-cd77307fe77a_terseLabel_en-US" xlink:label="lab_ifrs-full_IncomeTaxExpenseContinuingOperations" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Corporate tax expense</link:label>
    <link:label id="lab_ifrs-full_IncomeTaxExpenseContinuingOperations_label_en-US" xlink:label="lab_ifrs-full_IncomeTaxExpenseContinuingOperations" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Tax expense (income)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncomeTaxExpenseContinuingOperations" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncomeTaxExpenseContinuingOperations"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_IncomeTaxExpenseContinuingOperations" xlink:to="lab_ifrs-full_IncomeTaxExpenseContinuingOperations" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_NumberOfClinicalResearchProgram_019c564f-b466-77c8-9cde-676cfb92b27f_terseLabel_en-US" xlink:label="lab_gmab_NumberOfClinicalResearchProgram" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of clinical research program</link:label>
    <link:label id="lab_gmab_NumberOfClinicalResearchProgram_label_en-US" xlink:label="lab_gmab_NumberOfClinicalResearchProgram" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number Of Clinical Research Program</link:label>
    <link:label id="lab_gmab_NumberOfClinicalResearchProgram_documentation_en-US" xlink:label="lab_gmab_NumberOfClinicalResearchProgram" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Number Of Clinical Research Program</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_NumberOfClinicalResearchProgram" xlink:href="gmab-20251231.xsd#gmab_NumberOfClinicalResearchProgram"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_NumberOfClinicalResearchProgram" xlink:to="lab_gmab_NumberOfClinicalResearchProgram" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_TypesOfRevenuesMember_12fb53e0-efe1-42fe-9429-70b772c25af4_terseLabel_en-US" xlink:label="lab_gmab_TypesOfRevenuesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Types of revenues [member]</link:label>
    <link:label id="lab_gmab_TypesOfRevenuesMember_label_en-US" xlink:label="lab_gmab_TypesOfRevenuesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Types of Revenues [Member]</link:label>
    <link:label id="lab_gmab_TypesOfRevenuesMember_documentation_en-US" xlink:label="lab_gmab_TypesOfRevenuesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This member stands for This member stands for all types of revenues from customers. It also represents the standard value for the 'Types of revenues' axis if no other member is used.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_TypesOfRevenuesMember" xlink:href="gmab-20251231.xsd#gmab_TypesOfRevenuesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_TypesOfRevenuesMember" xlink:to="lab_gmab_TypesOfRevenuesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_NonCurrentContractLiabilitiesRecognisedAsOfAcquisitionDate_019c08be-a39d-77cd-b297-d0111e65b0e8_negatedTerseLabel_en-US" xlink:label="lab_gmab_NonCurrentContractLiabilitiesRecognisedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Non-current contract liabilities</link:label>
    <link:label id="lab_gmab_NonCurrentContractLiabilitiesRecognisedAsOfAcquisitionDate_label_en-US" xlink:label="lab_gmab_NonCurrentContractLiabilitiesRecognisedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Non-Current Contract Liabilities Recognised As of Acquisition Date</link:label>
    <link:label id="lab_gmab_NonCurrentContractLiabilitiesRecognisedAsOfAcquisitionDate_documentation_en-US" xlink:label="lab_gmab_NonCurrentContractLiabilitiesRecognisedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Non-Current Contract Liabilities Recognised As of Acquisition Date</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_NonCurrentContractLiabilitiesRecognisedAsOfAcquisitionDate" xlink:href="gmab-20251231.xsd#gmab_NonCurrentContractLiabilitiesRecognisedAsOfAcquisitionDate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_NonCurrentContractLiabilitiesRecognisedAsOfAcquisitionDate" xlink:to="lab_gmab_NonCurrentContractLiabilitiesRecognisedAsOfAcquisitionDate" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_ShortTermContractualObligations_19ea693d-2a80-4124-9895-8c8f87b85ac4_terseLabel_en-US" xlink:label="lab_gmab_ShortTermContractualObligations" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Short term contractual obligations</link:label>
    <link:label id="lab_gmab_ShortTermContractualObligations_label_en-US" xlink:label="lab_gmab_ShortTermContractualObligations" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Short Term Contractual Obligations</link:label>
    <link:label id="lab_gmab_ShortTermContractualObligations_documentation_en-US" xlink:label="lab_gmab_ShortTermContractualObligations" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The amount of short term contractual obligations primarily related to research and development activities.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_ShortTermContractualObligations" xlink:href="gmab-20251231.xsd#gmab_ShortTermContractualObligations"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_ShortTermContractualObligations" xlink:to="lab_gmab_ShortTermContractualObligations" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfMaturityAnalysisOfOperatingLeasePaymentsLineItems_314b69ed-eacd-43db-a26f-e6c5eb492b24_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfMaturityAnalysisOfOperatingLeasePaymentsLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure of maturity analysis of operating lease payments</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfMaturityAnalysisOfOperatingLeasePaymentsLineItems_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfMaturityAnalysisOfOperatingLeasePaymentsLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of maturity analysis of operating lease payments [line items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfMaturityAnalysisOfOperatingLeasePaymentsLineItems" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfMaturityAnalysisOfOperatingLeasePaymentsLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfMaturityAnalysisOfOperatingLeasePaymentsLineItems" xlink:to="lab_ifrs-full_DisclosureOfMaturityAnalysisOfOperatingLeasePaymentsLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_DisclosureOfDetailedInformationAboutExchangeRatesExplanatoryTableTextBlock_b0b97c9f-7575-4582-9096-7c9c07e0c891_terseLabel_en-US" xlink:label="lab_gmab_DisclosureOfDetailedInformationAboutExchangeRatesExplanatoryTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure of detailed information about exchange rates</link:label>
    <link:label id="lab_gmab_DisclosureOfDetailedInformationAboutExchangeRatesExplanatoryTableTextBlock_label_en-US" xlink:label="lab_gmab_DisclosureOfDetailedInformationAboutExchangeRatesExplanatoryTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure Of Detailed Information About Exchange Rates Explanatory [Table Text Block]</link:label>
    <link:label id="lab_gmab_DisclosureOfDetailedInformationAboutExchangeRatesExplanatoryTableTextBlock_documentation_en-US" xlink:label="lab_gmab_DisclosureOfDetailedInformationAboutExchangeRatesExplanatoryTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Disclosure Of Detailed Information About Exchange Rates Explanatory</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_DisclosureOfDetailedInformationAboutExchangeRatesExplanatoryTableTextBlock" xlink:href="gmab-20251231.xsd#gmab_DisclosureOfDetailedInformationAboutExchangeRatesExplanatoryTableTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_DisclosureOfDetailedInformationAboutExchangeRatesExplanatoryTableTextBlock" xlink:to="lab_gmab_DisclosureOfDetailedInformationAboutExchangeRatesExplanatoryTableTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_DocumentTransitionReport_019b0ccc-20bc-7eef-9026-de44fec095f5_terseLabel_en-US" xlink:label="lab_dei_DocumentTransitionReport" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Document Transition Report</link:label>
    <link:label id="lab_dei_DocumentTransitionReport_label_en-US" xlink:label="lab_dei_DocumentTransitionReport" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Document Transition Report</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentTransitionReport" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentTransitionReport"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_DocumentTransitionReport" xlink:to="lab_dei_DocumentTransitionReport" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_TradeAndOtherReceivables_1a95c93d-bd97-48fb-8121-7201d6c54b3f_verboseLabel_en-US" xlink:label="lab_ifrs-full_TradeAndOtherReceivables" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Receivables</link:label>
    <link:label id="lab_ifrs-full_TradeAndOtherReceivables_label_en-US" xlink:label="lab_ifrs-full_TradeAndOtherReceivables" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Trade and other receivables</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TradeAndOtherReceivables" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TradeAndOtherReceivables"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_TradeAndOtherReceivables" xlink:to="lab_ifrs-full_TradeAndOtherReceivables" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_FinancialCovenantPeriodDomain_019c5221-26b2-73ce-a6cb-1a1d3b648a02_terseLabel_en-US" xlink:label="lab_gmab_FinancialCovenantPeriodDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Financial Covenant Period [Domain]</link:label>
    <link:label id="lab_gmab_FinancialCovenantPeriodDomain_label_en-US" xlink:label="lab_gmab_FinancialCovenantPeriodDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Financial Covenant Period [Domain]</link:label>
    <link:label id="lab_gmab_FinancialCovenantPeriodDomain_documentation_en-US" xlink:label="lab_gmab_FinancialCovenantPeriodDomain" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Financial Covenant Test [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_FinancialCovenantPeriodDomain" xlink:href="gmab-20251231.xsd#gmab_FinancialCovenantPeriodDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_FinancialCovenantPeriodDomain" xlink:to="lab_gmab_FinancialCovenantPeriodDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_WeightedAverageExercisePriceWarrantsGranted_c005be2e-ffda-4b3b-ac1d-b5aa0c7c7d7f_terseLabel_en-US" xlink:label="lab_gmab_WeightedAverageExercisePriceWarrantsGranted" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Exercise price (in DKK per share)</link:label>
    <link:label id="lab_gmab_WeightedAverageExercisePriceWarrantsGranted_label_en-US" xlink:label="lab_gmab_WeightedAverageExercisePriceWarrantsGranted" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Weighted Average Exercise Price, Warrants Granted</link:label>
    <link:label id="lab_gmab_WeightedAverageExercisePriceWarrantsGranted_documentation_en-US" xlink:label="lab_gmab_WeightedAverageExercisePriceWarrantsGranted" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The weighted average exercise price of warrants granted.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_WeightedAverageExercisePriceWarrantsGranted" xlink:href="gmab-20251231.xsd#gmab_WeightedAverageExercisePriceWarrantsGranted"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_WeightedAverageExercisePriceWarrantsGranted" xlink:to="lab_gmab_WeightedAverageExercisePriceWarrantsGranted" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CashFlowsFromUsedInOperatingActivitiesAbstract_9017e576-2b12-4c5e-b3eb-dce88d286d8c_terseLabel_en-US" xlink:label="lab_ifrs-full_CashFlowsFromUsedInOperatingActivitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash flows from operating activities:</link:label>
    <link:label id="lab_ifrs-full_CashFlowsFromUsedInOperatingActivitiesAbstract_label_en-US" xlink:label="lab_ifrs-full_CashFlowsFromUsedInOperatingActivitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash flows from (used in) operating activities [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInOperatingActivitiesAbstract" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CashFlowsFromUsedInOperatingActivitiesAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CashFlowsFromUsedInOperatingActivitiesAbstract" xlink:to="lab_ifrs-full_CashFlowsFromUsedInOperatingActivitiesAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_GMABWarrantsGrantedFromMarch2017UntilFebruary2021Member_a95e1b71-be79-4f38-b6cd-ab3704d25304_terseLabel_en-US" xlink:label="lab_gmab_GMABWarrantsGrantedFromMarch2017UntilFebruary2021Member" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">March 2017 - February 2021</link:label>
    <link:label id="lab_gmab_GMABWarrantsGrantedFromMarch2017UntilFebruary2021Member_label_en-US" xlink:label="lab_gmab_GMABWarrantsGrantedFromMarch2017UntilFebruary2021Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">GMAB Warrants Granted From March 2017 Until February 2021 [Member]</link:label>
    <link:label id="lab_gmab_GMABWarrantsGrantedFromMarch2017UntilFebruary2021Member_documentation_en-US" xlink:label="lab_gmab_GMABWarrantsGrantedFromMarch2017UntilFebruary2021Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents GMAB warrants granted from March2017 until February2021 member.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_GMABWarrantsGrantedFromMarch2017UntilFebruary2021Member" xlink:href="gmab-20251231.xsd#gmab_GMABWarrantsGrantedFromMarch2017UntilFebruary2021Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_GMABWarrantsGrantedFromMarch2017UntilFebruary2021Member" xlink:to="lab_gmab_GMABWarrantsGrantedFromMarch2017UntilFebruary2021Member" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_SellingGeneralAndAdministrativeExpense_a1730389-0cb6-4ec0-a336-b41fa212cd83_negatedLabel_en-US" xlink:label="lab_ifrs-full_SellingGeneralAndAdministrativeExpense" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Selling, general and administrative expenses</link:label>
    <link:label id="lab_ifrs-full_SellingGeneralAndAdministrativeExpense_label_en-US" xlink:label="lab_ifrs-full_SellingGeneralAndAdministrativeExpense" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Selling, general and administrative expense</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SellingGeneralAndAdministrativeExpense" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SellingGeneralAndAdministrativeExpense"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_SellingGeneralAndAdministrativeExpense" xlink:to="lab_ifrs-full_SellingGeneralAndAdministrativeExpense" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_DocumentPeriodEndDate_87e9c843-7f63-4a08-9831-5864f76053a8_terseLabel_en-US" xlink:label="lab_dei_DocumentPeriodEndDate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Document Period End Date</link:label>
    <link:label id="lab_dei_DocumentPeriodEndDate_label_en-US" xlink:label="lab_dei_DocumentPeriodEndDate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Document Period End Date</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentPeriodEndDate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_DocumentPeriodEndDate" xlink:to="lab_dei_DocumentPeriodEndDate" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_ProceedsFromNonRefundableUpfrontPayment_20640afe-d294-454b-a223-58b3001c558f_terseLabel_en-US" xlink:label="lab_gmab_ProceedsFromNonRefundableUpfrontPayment" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Upfront payment</link:label>
    <link:label id="lab_gmab_ProceedsFromNonRefundableUpfrontPayment_label_en-US" xlink:label="lab_gmab_ProceedsFromNonRefundableUpfrontPayment" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proceeds From Non Refundable Upfront Payment</link:label>
    <link:label id="lab_gmab_ProceedsFromNonRefundableUpfrontPayment_documentation_en-US" xlink:label="lab_gmab_ProceedsFromNonRefundableUpfrontPayment" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Proceeds From Non Refundable Upfront Payment</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_ProceedsFromNonRefundableUpfrontPayment" xlink:href="gmab-20251231.xsd#gmab_ProceedsFromNonRefundableUpfrontPayment"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_ProceedsFromNonRefundableUpfrontPayment" xlink:to="lab_gmab_ProceedsFromNonRefundableUpfrontPayment" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_330a254d-d7af-4b40-9f43-d6d46438fb90_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure of classes of share capital [line items]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of classes of share capital [line items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfClassesOfShareCapitalLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems" xlink:to="lab_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesRightofuseAssets_019b1d83-2d5d-70af-b5ff-7115bd7e9fe0_terseLabel_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesRightofuseAssets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Exchange rate adjustment</link:label>
    <link:label id="lab_ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesRightofuseAssets_label_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesRightofuseAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (decrease) through net exchange differences, right-of-use assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesRightofuseAssets" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesRightofuseAssets"/>
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    <link:label id="lab_ifrs-full_MaturityAxis_10183ef0-1694-4be8-9881-1e21ffdab01a_terseLabel_en-US" xlink:label="lab_ifrs-full_MaturityAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Maturity [axis]</link:label>
    <link:label id="lab_ifrs-full_MaturityAxis_label_en-US" xlink:label="lab_ifrs-full_MaturityAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Maturity [axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MaturityAxis" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MaturityAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_MaturityAxis" xlink:to="lab_ifrs-full_MaturityAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_SaleOrIssueOfTreasuryShares_019c5105-dc33-7570-a9f2-66afae4426b1_negatedLabel_en-US" xlink:label="lab_ifrs-full_SaleOrIssueOfTreasuryShares" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Shares used for funding RSU program</link:label>
    <link:label id="lab_ifrs-full_SaleOrIssueOfTreasuryShares_label_en-US" xlink:label="lab_ifrs-full_SaleOrIssueOfTreasuryShares" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Sale or issue of treasury shares</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SaleOrIssueOfTreasuryShares" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SaleOrIssueOfTreasuryShares"/>
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    <link:label id="lab_gmab_AssetAcquisition.Axis_019c5611-e8e4-731d-aeaf-9619e40ef471_terseLabel_en-US" xlink:label="lab_gmab_AssetAcquisition.Axis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Asset Acquisition [Axis]</link:label>
    <link:label id="lab_gmab_AssetAcquisition.Axis_label_en-US" xlink:label="lab_gmab_AssetAcquisition.Axis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Asset Acquisition. [Axis]</link:label>
    <link:label id="lab_gmab_AssetAcquisition.Axis_documentation_en-US" xlink:label="lab_gmab_AssetAcquisition.Axis" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Asset Acquisition.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_AssetAcquisition.Axis" xlink:href="gmab-20251231.xsd#gmab_AssetAcquisition.Axis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_AssetAcquisition.Axis" xlink:to="lab_gmab_AssetAcquisition.Axis" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_GainsOnMarketableSecurities_8631f2a4-4c70-43ef-98c7-667e18c2ebe3_terseLabel_en-US" xlink:label="lab_gmab_GainsOnMarketableSecurities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Gain on marketable securities</link:label>
    <link:label id="lab_gmab_GainsOnMarketableSecurities_label_en-US" xlink:label="lab_gmab_GainsOnMarketableSecurities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Gains on Marketable Securities</link:label>
    <link:label id="lab_gmab_GainsOnMarketableSecurities_documentation_en-US" xlink:label="lab_gmab_GainsOnMarketableSecurities" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The gains on marketable securities.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_GainsOnMarketableSecurities" xlink:href="gmab-20251231.xsd#gmab_GainsOnMarketableSecurities"/>
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    <link:label id="lab_ifrs-full_Goodwill_77b560cd-23f9-46b1-8006-6dd070f36b15_terseLabel_en-US" xlink:label="lab_ifrs-full_Goodwill" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Goodwill</link:label>
    <link:label id="lab_ifrs-full_Goodwill_label_en-US" xlink:label="lab_ifrs-full_Goodwill" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Goodwill</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Goodwill" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Goodwill"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_Goodwill" xlink:to="lab_ifrs-full_Goodwill" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_NumberOfDeliveryLicenses_7bb605d3-8ed5-46a5-90a5-991abb9dd78e_terseLabel_en-US" xlink:label="lab_gmab_NumberOfDeliveryLicenses" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of delivery license programs</link:label>
    <link:label id="lab_gmab_NumberOfDeliveryLicenses_label_en-US" xlink:label="lab_gmab_NumberOfDeliveryLicenses" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number of Delivery Licenses</link:label>
    <link:label id="lab_gmab_NumberOfDeliveryLicenses_documentation_en-US" xlink:label="lab_gmab_NumberOfDeliveryLicenses" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the number of delivery license programs.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_NumberOfDeliveryLicenses" xlink:href="gmab-20251231.xsd#gmab_NumberOfDeliveryLicenses"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_NumberOfDeliveryLicenses" xlink:to="lab_gmab_NumberOfDeliveryLicenses" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CurrentAndDeferredTaxRelatingToItemsChargedOrCreditedDirectlyToEquity_019c4ed4-290f-78d3-bcdb-ba32c0207de7_terseLabel_en-US" xlink:label="lab_ifrs-full_CurrentAndDeferredTaxRelatingToItemsChargedOrCreditedDirectlyToEquity" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total tax for the period in shareholders' equity</link:label>
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    <link:label id="lab_ifrs-full_CurrentAndDeferredTaxRelatingToItemsChargedOrCreditedDirectlyToEquity_label_en-US" xlink:label="lab_ifrs-full_CurrentAndDeferredTaxRelatingToItemsChargedOrCreditedDirectlyToEquity" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Current and deferred tax relating to items credited (charged) directly to equity</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentAndDeferredTaxRelatingToItemsChargedOrCreditedDirectlyToEquity" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CurrentAndDeferredTaxRelatingToItemsChargedOrCreditedDirectlyToEquity"/>
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    <link:label id="lab_dei_DocumentType_9555fe0f-6007-425a-8786-8fa21bcc0fd1_terseLabel_en-US" xlink:label="lab_dei_DocumentType" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Document Type</link:label>
    <link:label id="lab_dei_DocumentType_label_en-US" xlink:label="lab_dei_DocumentType" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Document Type</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentType"/>
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    <link:label id="lab_ifrs-full_ExpenseFromSharebasedPaymentTransactionsWithEmployees_397e4997-86b3-4f89-820c-2bf89debccbb_terseLabel_en-US" xlink:label="lab_ifrs-full_ExpenseFromSharebasedPaymentTransactionsWithEmployees" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share-based compensation</link:label>
    <link:label id="lab_ifrs-full_ExpenseFromSharebasedPaymentTransactionsWithEmployees_019c4ec8-77ea-7585-93b9-7a1c54e8e09a_verboseLabel_en-US" xlink:label="lab_ifrs-full_ExpenseFromSharebasedPaymentTransactionsWithEmployees" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Employee benefits expense</link:label>
    <link:label id="lab_ifrs-full_ExpenseFromSharebasedPaymentTransactionsWithEmployees_label_en-US" xlink:label="lab_ifrs-full_ExpenseFromSharebasedPaymentTransactionsWithEmployees" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Expense from share-based payment transactions with employees</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ExpenseFromSharebasedPaymentTransactionsWithEmployees" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ExpenseFromSharebasedPaymentTransactionsWithEmployees"/>
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    <link:label id="lab_ifrs-full_ClassesOfFinancialAssetsAxis_e19c4194-c8ca-45e8-9c71-627f77c1014a_terseLabel_en-US" xlink:label="lab_ifrs-full_ClassesOfFinancialAssetsAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Classes of financial assets [axis]</link:label>
    <link:label id="lab_ifrs-full_ClassesOfFinancialAssetsAxis_label_en-US" xlink:label="lab_ifrs-full_ClassesOfFinancialAssetsAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Classes of financial assets [axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialAssetsAxis" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialAssetsAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsAxis" xlink:to="lab_ifrs-full_ClassesOfFinancialAssetsAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForFinancialInstrumentsAtFairValueThroughProfitOrLossExplanatory_019bc732-40a1-7dc0-af6c-7718b1b6d5f8_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForFinancialInstrumentsAtFairValueThroughProfitOrLossExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Classification of categories of financial assets and liabilities</link:label>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForFinancialInstrumentsAtFairValueThroughProfitOrLossExplanatory_label_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForFinancialInstrumentsAtFairValueThroughProfitOrLossExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Description of accounting policy for financial instruments at fair value through profit or loss [text block]</link:label>
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    <link:label id="lab_gmab_AdjustmentsForUnrecognizedDeferredTaxAssets_5c2cff4a-0c75-4caf-939d-88d7795d2688_verboseLabel_en-US" xlink:label="lab_gmab_AdjustmentsForUnrecognizedDeferredTaxAssets" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Net increase (decrease) of unrecognized deferred tax assets for the year</link:label>
    <link:label id="lab_gmab_AdjustmentsForUnrecognizedDeferredTaxAssets_label_en-US" xlink:label="lab_gmab_AdjustmentsForUnrecognizedDeferredTaxAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Adjustments For Unrecognized Deferred Tax Assets</link:label>
    <link:label id="lab_gmab_AdjustmentsForUnrecognizedDeferredTaxAssets_documentation_en-US" xlink:label="lab_gmab_AdjustmentsForUnrecognizedDeferredTaxAssets" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The amount of adjustment to unrecognized deferred tax assets.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_AdjustmentsForUnrecognizedDeferredTaxAssets" xlink:href="gmab-20251231.xsd#gmab_AdjustmentsForUnrecognizedDeferredTaxAssets"/>
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    <link:label id="lab_ifrs-full_IncomeStatementAbstract_d5630ad0-ca35-4c96-89e8-25f646e7881f_terseLabel_en-US" xlink:label="lab_ifrs-full_IncomeStatementAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Profit or loss [abstract]</link:label>
    <link:label id="lab_ifrs-full_IncomeStatementAbstract_label_en-US" xlink:label="lab_ifrs-full_IncomeStatementAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Profit or loss [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncomeStatementAbstract" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncomeStatementAbstract"/>
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    <link:label id="lab_ifrs-full_CurrentContractLiabilities_22fd38f9-a106-47b1-af48-77e3a925d991_terseLabel_en-US" xlink:label="lab_ifrs-full_CurrentContractLiabilities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Contract liabilities</link:label>
    <link:label id="lab_ifrs-full_CurrentContractLiabilities_32021d1d-c1d6-4024-b0d2-66f93b81fe58_verboseLabel_en-US" xlink:label="lab_ifrs-full_CurrentContractLiabilities" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Current contract liabilities</link:label>
    <link:label id="lab_ifrs-full_CurrentContractLiabilities_label_en-US" xlink:label="lab_ifrs-full_CurrentContractLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Current contract liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentContractLiabilities" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CurrentContractLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CurrentContractLiabilities" xlink:to="lab_ifrs-full_CurrentContractLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_srt_RangeAxis_019c51fd-fcb4-77bf-995f-c6852e395be4_terseLabel_en-US" xlink:label="lab_srt_RangeAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Statistical Measurement [Axis]</link:label>
    <link:label id="lab_srt_RangeAxis_label_en-US" xlink:label="lab_srt_RangeAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Statistical Measurement [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_RangeAxis" xlink:to="lab_srt_RangeAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_WeightedAverageExercisePriceOfFairValueOfWarrants_32eb74e5-8003-48b7-8ac6-e34843db7245_terseLabel_en-US" xlink:label="lab_gmab_WeightedAverageExercisePriceOfFairValueOfWarrants" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Weighted average Black-Scholes fair value per warrant granted (in DKK per share)</link:label>
    <link:label id="lab_gmab_WeightedAverageExercisePriceOfFairValueOfWarrants_label_en-US" xlink:label="lab_gmab_WeightedAverageExercisePriceOfFairValueOfWarrants" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Weighted Average Exercise Price Of Fair Value Of Warrants</link:label>
    <link:label id="lab_gmab_WeightedAverageExercisePriceOfFairValueOfWarrants_documentation_en-US" xlink:label="lab_gmab_WeightedAverageExercisePriceOfFairValueOfWarrants" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Exercise price per share or per unit of fair value of warrants during the period.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_WeightedAverageExercisePriceOfFairValueOfWarrants" xlink:href="gmab-20251231.xsd#gmab_WeightedAverageExercisePriceOfFairValueOfWarrants"/>
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    <link:label id="lab_ifrs-full_RevenueOfCombinedEntity_c6232cfc-ac4c-46bf-b2e3-2175f8dd7f7e_terseLabel_en-US" xlink:label="lab_ifrs-full_RevenueOfCombinedEntity" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Revenue</link:label>
    <link:label id="lab_ifrs-full_RevenueOfCombinedEntity_label_en-US" xlink:label="lab_ifrs-full_RevenueOfCombinedEntity" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Revenue of combined entity as if combination occurred at beginning of period</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RevenueOfCombinedEntity" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RevenueOfCombinedEntity"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_RevenueOfCombinedEntity" xlink:to="lab_ifrs-full_RevenueOfCombinedEntity" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ClassesOfAssetsAxis_019bc5c3-ed30-7021-b65d-ce13fdc9ca25_terseLabel_en-US" xlink:label="lab_ifrs-full_ClassesOfAssetsAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Classes of assets [axis]</link:label>
    <link:label id="lab_ifrs-full_ClassesOfAssetsAxis_label_en-US" xlink:label="lab_ifrs-full_ClassesOfAssetsAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Classes of assets [axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfAssetsAxis" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfAssetsAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ClassesOfAssetsAxis" xlink:to="lab_ifrs-full_ClassesOfAssetsAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_DiscoverResearchAndDevelopmentCostResponsibilityPercent_2ced344b-fb23-44d4-8bcc-3535aa2ea9fa_terseLabel_en-US" xlink:label="lab_gmab_DiscoverResearchAndDevelopmentCostResponsibilityPercent" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Percentage of discover research and development cost responsible by the entity</link:label>
    <link:label id="lab_gmab_DiscoverResearchAndDevelopmentCostResponsibilityPercent_label_en-US" xlink:label="lab_gmab_DiscoverResearchAndDevelopmentCostResponsibilityPercent" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Discover Research and Development Cost Responsibility Percent</link:label>
    <link:label id="lab_gmab_DiscoverResearchAndDevelopmentCostResponsibilityPercent_documentation_en-US" xlink:label="lab_gmab_DiscoverResearchAndDevelopmentCostResponsibilityPercent" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The percentage of discover research and development cost responsible by the entity.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_DiscoverResearchAndDevelopmentCostResponsibilityPercent" xlink:href="gmab-20251231.xsd#gmab_DiscoverResearchAndDevelopmentCostResponsibilityPercent"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_DiscoverResearchAndDevelopmentCostResponsibilityPercent" xlink:to="lab_gmab_DiscoverResearchAndDevelopmentCostResponsibilityPercent" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_NumberOfBusinessUnit_baf86f70-cfe5-4ec3-960e-6a73dc6b4abc_terseLabel_en-US" xlink:label="lab_gmab_NumberOfBusinessUnit" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of business unit</link:label>
    <link:label id="lab_gmab_NumberOfBusinessUnit_label_en-US" xlink:label="lab_gmab_NumberOfBusinessUnit" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number of Business Unit</link:label>
    <link:label id="lab_gmab_NumberOfBusinessUnit_documentation_en-US" xlink:label="lab_gmab_NumberOfBusinessUnit" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Number of reporting units tested for impairment of goodwill. A reporting unit is an operating segment or one level below an operating segment.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_NumberOfBusinessUnit" xlink:href="gmab-20251231.xsd#gmab_NumberOfBusinessUnit"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_NumberOfBusinessUnit" xlink:to="lab_gmab_NumberOfBusinessUnit" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_TradeAndOtherPayablesToTradeSuppliers_5bef9d2f-b84d-4164-81e6-89ee46ff546a_terseLabel_en-US" xlink:label="lab_ifrs-full_TradeAndOtherPayablesToTradeSuppliers" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accounts payable</link:label>
    <link:label id="lab_ifrs-full_TradeAndOtherPayablesToTradeSuppliers_label_en-US" xlink:label="lab_ifrs-full_TradeAndOtherPayablesToTradeSuppliers" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Trade payables</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TradeAndOtherPayablesToTradeSuppliers" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TradeAndOtherPayablesToTradeSuppliers"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_TradeAndOtherPayablesToTradeSuppliers" xlink:to="lab_ifrs-full_TradeAndOtherPayablesToTradeSuppliers" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_LaterThanFourYearsAndNotLaterThanFiveYearsMember_c3dfda42-c0d8-44d2-9f17-90531c7d7602_verboseLabel_en-US" xlink:label="lab_ifrs-full_LaterThanFourYearsAndNotLaterThanFiveYearsMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">2029</link:label>
    <link:label id="lab_ifrs-full_LaterThanFourYearsAndNotLaterThanFiveYearsMember_label_en-US" xlink:label="lab_ifrs-full_LaterThanFourYearsAndNotLaterThanFiveYearsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Later than four years and not later than five years [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LaterThanFourYearsAndNotLaterThanFiveYearsMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LaterThanFourYearsAndNotLaterThanFiveYearsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_LaterThanFourYearsAndNotLaterThanFiveYearsMember" xlink:to="lab_ifrs-full_LaterThanFourYearsAndNotLaterThanFiveYearsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_IfrsCollaborativeArrangementAndArrangementOtherThanCollaborativeTable_da61c188-d19b-4b8c-b04c-c4c5a9f07e8c_terseLabel_en-US" xlink:label="lab_gmab_IfrsCollaborativeArrangementAndArrangementOtherThanCollaborativeTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Collaborative Arrangement and Arrangement Other than Collaborative [Table]</link:label>
    <link:label id="lab_gmab_IfrsCollaborativeArrangementAndArrangementOtherThanCollaborativeTable_label_en-US" xlink:label="lab_gmab_IfrsCollaborativeArrangementAndArrangementOtherThanCollaborativeTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Ifrs Collaborative Arrangement and Arrangement Other than Collaborative [Table]</link:label>
    <link:label id="lab_gmab_IfrsCollaborativeArrangementAndArrangementOtherThanCollaborativeTable_documentation_en-US" xlink:label="lab_gmab_IfrsCollaborativeArrangementAndArrangementOtherThanCollaborativeTable" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Disclosure of information about collaborative arrangement and arrangement other than collaborative applicable to revenue-generating activity or operations.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_IfrsCollaborativeArrangementAndArrangementOtherThanCollaborativeTable" xlink:href="gmab-20251231.xsd#gmab_IfrsCollaborativeArrangementAndArrangementOtherThanCollaborativeTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_IfrsCollaborativeArrangementAndArrangementOtherThanCollaborativeTable" xlink:to="lab_gmab_IfrsCollaborativeArrangementAndArrangementOtherThanCollaborativeTable" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_a71407ff-1f7c-41ff-8128-20ad45caea3e_terseLabel_en-US" xlink:label="lab_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Types of share-based payment arrangements [domain]</link:label>
    <link:label id="lab_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_label_en-US" xlink:label="lab_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Types of share-based payment arrangements [domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfSharebasedPaymentArrangementsDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain" xlink:to="lab_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_CashTransferredRelatedToLegalAdvisoryAndOtherAcquisitionCosts_019c1ef2-1c74-7629-81fa-297098de55e1_netLabel_en-US" xlink:label="lab_gmab_CashTransferredRelatedToLegalAdvisoryAndOtherAcquisitionCosts" xlink:role="http://www.xbrl.org/2009/role/netLabel" xlink:type="resource" xml:lang="en-US">Cash paid for Genmab directly attributable acquisition related costs</link:label>
    <link:label id="lab_gmab_CashTransferredRelatedToLegalAdvisoryAndOtherAcquisitionCosts_label_en-US" xlink:label="lab_gmab_CashTransferredRelatedToLegalAdvisoryAndOtherAcquisitionCosts" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash Transferred Related To Legal, Advisory And Other Acquisition Costs</link:label>
    <link:label id="lab_gmab_CashTransferredRelatedToLegalAdvisoryAndOtherAcquisitionCosts_documentation_en-US" xlink:label="lab_gmab_CashTransferredRelatedToLegalAdvisoryAndOtherAcquisitionCosts" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Cash Transferred Related To Legal, Advisory And Other Acquisition Costs</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_CashTransferredRelatedToLegalAdvisoryAndOtherAcquisitionCosts" xlink:href="gmab-20251231.xsd#gmab_CashTransferredRelatedToLegalAdvisoryAndOtherAcquisitionCosts"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_CashTransferredRelatedToLegalAdvisoryAndOtherAcquisitionCosts" xlink:to="lab_gmab_CashTransferredRelatedToLegalAdvisoryAndOtherAcquisitionCosts" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_DisclosureOfMaturityProfileOfOurMarketableSecuritiesTableTextBlock_84ca2b7b-a6a4-4f63-9297-13edfbd142d1_terseLabel_en-US" xlink:label="lab_gmab_DisclosureOfMaturityProfileOfOurMarketableSecuritiesTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of maturity profile of our marketable securities</link:label>
    <link:label id="lab_gmab_DisclosureOfMaturityProfileOfOurMarketableSecuritiesTableTextBlock_label_en-US" xlink:label="lab_gmab_DisclosureOfMaturityProfileOfOurMarketableSecuritiesTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure Of Maturity Profile Of Our Marketable Securities [Table Text Block]</link:label>
    <link:label id="lab_gmab_DisclosureOfMaturityProfileOfOurMarketableSecuritiesTableTextBlock_documentation_en-US" xlink:label="lab_gmab_DisclosureOfMaturityProfileOfOurMarketableSecuritiesTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Tabular disclosure of maturity profile of our marketable securities.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_DisclosureOfMaturityProfileOfOurMarketableSecuritiesTableTextBlock" xlink:href="gmab-20251231.xsd#gmab_DisclosureOfMaturityProfileOfOurMarketableSecuritiesTableTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_DisclosureOfMaturityProfileOfOurMarketableSecuritiesTableTextBlock" xlink:to="lab_gmab_DisclosureOfMaturityProfileOfOurMarketableSecuritiesTableTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_RangeAxis_dd1a2dda-49fe-4650-a80e-f1f46e3e13ed_terseLabel_en-US" xlink:label="lab_ifrs-full_RangeAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Range [axis]</link:label>
    <link:label id="lab_ifrs-full_RangeAxis_label_en-US" xlink:label="lab_ifrs-full_RangeAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Range [axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RangeAxis" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RangeAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_RangeAxis" xlink:to="lab_ifrs-full_RangeAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_RestatedMember_019b07e1-e368-7ef7-b2d8-b2e8276c6ff9_terseLabel_en-US" xlink:label="lab_ifrs-full_RestatedMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Currently stated [member]</link:label>
    <link:label id="lab_ifrs-full_RestatedMember_label_en-US" xlink:label="lab_ifrs-full_RestatedMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Currently stated [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RestatedMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RestatedMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_RestatedMember" xlink:to="lab_ifrs-full_RestatedMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ComponentsOfEquityAxis_952a2908-8904-4fb2-8af4-f3918ab48141_terseLabel_en-US" xlink:label="lab_ifrs-full_ComponentsOfEquityAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Components of equity [axis]</link:label>
    <link:label id="lab_ifrs-full_ComponentsOfEquityAxis_label_en-US" xlink:label="lab_ifrs-full_ComponentsOfEquityAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Components of equity [axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComponentsOfEquityAxis" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ComponentsOfEquityAxis" xlink:to="lab_ifrs-full_ComponentsOfEquityAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_ContractLiabilitiesExchangeRateAdjustment_019b2133-097b-71db-94c2-b5ef157643a6_terseLabel_en-US" xlink:label="lab_gmab_ContractLiabilitiesExchangeRateAdjustment" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Exchange rate adjustment</link:label>
    <link:label id="lab_gmab_ContractLiabilitiesExchangeRateAdjustment_label_en-US" xlink:label="lab_gmab_ContractLiabilitiesExchangeRateAdjustment" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Contract Liabilities, Exchange Rate Adjustment</link:label>
    <link:label id="lab_gmab_ContractLiabilitiesExchangeRateAdjustment_documentation_en-US" xlink:label="lab_gmab_ContractLiabilitiesExchangeRateAdjustment" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Contract Liabilities, Exchange Rate Adjustment</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_ContractLiabilitiesExchangeRateAdjustment" xlink:href="gmab-20251231.xsd#gmab_ContractLiabilitiesExchangeRateAdjustment"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_ContractLiabilitiesExchangeRateAdjustment" xlink:to="lab_gmab_ContractLiabilitiesExchangeRateAdjustment" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_ScheduleOfInventoriesTable_31c3b6be-403a-4676-9245-bfaada98afb3_terseLabel_en-US" xlink:label="lab_gmab_ScheduleOfInventoriesTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Inventories [Table]</link:label>
    <link:label id="lab_gmab_ScheduleOfInventoriesTable_label_en-US" xlink:label="lab_gmab_ScheduleOfInventoriesTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Inventories [Table]</link:label>
    <link:label id="lab_gmab_ScheduleOfInventoriesTable_documentation_en-US" xlink:label="lab_gmab_ScheduleOfInventoriesTable" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Schedule disclosing information related to inventories.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_ScheduleOfInventoriesTable" xlink:href="gmab-20251231.xsd#gmab_ScheduleOfInventoriesTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_ScheduleOfInventoriesTable" xlink:to="lab_gmab_ScheduleOfInventoriesTable" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_RestrictedShareUnitsMember_019b2c89-17f9-72cc-8746-274c6124d81a_terseLabel_en-US" xlink:label="lab_ifrs-full_RestrictedShareUnitsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Restricted Stock Units (RSU)</link:label>
    <link:label id="lab_ifrs-full_RestrictedShareUnitsMember_label_en-US" xlink:label="lab_ifrs-full_RestrictedShareUnitsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Restricted share units [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RestrictedShareUnitsMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RestrictedShareUnitsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_RestrictedShareUnitsMember" xlink:to="lab_ifrs-full_RestrictedShareUnitsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_JanVanDeWinkelMember_33ca31a9-b4b9-47af-b4e0-10ecb3e503eb_terseLabel_en-US" xlink:label="lab_gmab_JanVanDeWinkelMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Jan van de Winkel</link:label>
    <link:label id="lab_gmab_JanVanDeWinkelMember_label_en-US" xlink:label="lab_gmab_JanVanDeWinkelMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Jan Van De Winkel [Member]</link:label>
    <link:label id="lab_gmab_JanVanDeWinkelMember_documentation_en-US" xlink:label="lab_gmab_JanVanDeWinkelMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents information pertaining to Jan van de Winkel.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_JanVanDeWinkelMember" xlink:href="gmab-20251231.xsd#gmab_JanVanDeWinkelMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_JanVanDeWinkelMember" xlink:to="lab_gmab_JanVanDeWinkelMember" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_MartinSchultzMember_d78e2d57-f5c5-46ae-a034-1e92359533df_terseLabel_en-US" xlink:label="lab_gmab_MartinSchultzMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Martin Schultz</link:label>
    <link:label id="lab_gmab_MartinSchultzMember_label_en-US" xlink:label="lab_gmab_MartinSchultzMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Martin Schultz [Member]</link:label>
    <link:label id="lab_gmab_MartinSchultzMember_documentation_en-US" xlink:label="lab_gmab_MartinSchultzMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents information pertaining to Martin Schultz.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_MartinSchultzMember" xlink:href="gmab-20251231.xsd#gmab_MartinSchultzMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_MartinSchultzMember" xlink:to="lab_gmab_MartinSchultzMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ProfitLossBeforeTax_723934a1-938d-4381-a566-d7898fd6c392_totalLabel_en-US" xlink:label="lab_ifrs-full_ProfitLossBeforeTax" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net profit before tax</link:label>
    <link:label id="lab_ifrs-full_ProfitLossBeforeTax_e0d104f9-8dc1-4434-9bef-9f1f9f3385d8_verboseLabel_en-US" xlink:label="lab_ifrs-full_ProfitLossBeforeTax" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Net profit before tax</link:label>
    <link:label id="lab_ifrs-full_ProfitLossBeforeTax_be80dc0d-fa3d-4e2d-ac9f-55f796253a5b_terseLabel_en-US" xlink:label="lab_ifrs-full_ProfitLossBeforeTax" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net profit before tax</link:label>
    <link:label id="lab_ifrs-full_ProfitLossBeforeTax_label_en-US" xlink:label="lab_ifrs-full_ProfitLossBeforeTax" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Profit (loss) before tax</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProfitLossBeforeTax" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProfitLossBeforeTax"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ProfitLossBeforeTax" xlink:to="lab_ifrs-full_ProfitLossBeforeTax" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_NumberOfPeriodTerminationSeverancePaymentChangeInControl_1de12b68-1d87-4861-ac0c-e357b418cc81_terseLabel_en-US" xlink:label="lab_gmab_NumberOfPeriodTerminationSeverancePaymentChangeInControl" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Termination compensation period due to change in control</link:label>
    <link:label id="lab_gmab_NumberOfPeriodTerminationSeverancePaymentChangeInControl_label_en-US" xlink:label="lab_gmab_NumberOfPeriodTerminationSeverancePaymentChangeInControl" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number of Period, Termination Severance Payment, Change in Control</link:label>
    <link:label id="lab_gmab_NumberOfPeriodTerminationSeverancePaymentChangeInControl_documentation_en-US" xlink:label="lab_gmab_NumberOfPeriodTerminationSeverancePaymentChangeInControl" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The period for which the termination severance pay the entity obliged to pay in the event of termination due to change in control.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_NumberOfPeriodTerminationSeverancePaymentChangeInControl" xlink:href="gmab-20251231.xsd#gmab_NumberOfPeriodTerminationSeverancePaymentChangeInControl"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_NumberOfPeriodTerminationSeverancePaymentChangeInControl" xlink:to="lab_gmab_NumberOfPeriodTerminationSeverancePaymentChangeInControl" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_AccruedInterestExpenseBorrowings_019c562b-859c-7e16-a1fa-410cbd612ca1_terseLabel_en-US" xlink:label="lab_gmab_AccruedInterestExpenseBorrowings" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accrued interest expense, borrowings</link:label>
    <link:label id="lab_gmab_AccruedInterestExpenseBorrowings_label_en-US" xlink:label="lab_gmab_AccruedInterestExpenseBorrowings" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accrued Interest Expense, Borrowings</link:label>
    <link:label id="lab_gmab_AccruedInterestExpenseBorrowings_documentation_en-US" xlink:label="lab_gmab_AccruedInterestExpenseBorrowings" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Accrued Interest Expense, Borrowings</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_AccruedInterestExpenseBorrowings" xlink:href="gmab-20251231.xsd#gmab_AccruedInterestExpenseBorrowings"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_AccruedInterestExpenseBorrowings" xlink:to="lab_gmab_AccruedInterestExpenseBorrowings" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_ContractLiabilitiesAdditionsFromAssetsAcquisitions_019c0510-efb2-7703-a16d-d7b202c0d237_terseLabel_en-US" xlink:label="lab_gmab_ContractLiabilitiesAdditionsFromAssetsAcquisitions" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Additions from asset acquisition</link:label>
    <link:label id="lab_gmab_ContractLiabilitiesAdditionsFromAssetsAcquisitions_label_en-US" xlink:label="lab_gmab_ContractLiabilitiesAdditionsFromAssetsAcquisitions" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Contract Liabilities, Additions From Assets Acquisitions</link:label>
    <link:label id="lab_gmab_ContractLiabilitiesAdditionsFromAssetsAcquisitions_documentation_en-US" xlink:label="lab_gmab_ContractLiabilitiesAdditionsFromAssetsAcquisitions" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Contract Liabilities, Additions From Assets Acquisitions</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_ContractLiabilitiesAdditionsFromAssetsAcquisitions" xlink:href="gmab-20251231.xsd#gmab_ContractLiabilitiesAdditionsFromAssetsAcquisitions"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_ContractLiabilitiesAdditionsFromAssetsAcquisitions" xlink:to="lab_gmab_ContractLiabilitiesAdditionsFromAssetsAcquisitions" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_DefinedContributionPlansPensionObligation_fc6eb33a-42c7-4495-b64c-bbcf0133ea85_terseLabel_en-US" xlink:label="lab_gmab_DefinedContributionPlansPensionObligation" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Pension obligations</link:label>
    <link:label id="lab_gmab_DefinedContributionPlansPensionObligation_label_en-US" xlink:label="lab_gmab_DefinedContributionPlansPensionObligation" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Defined Contribution Plans, Pension Obligation</link:label>
    <link:label id="lab_gmab_DefinedContributionPlansPensionObligation_documentation_en-US" xlink:label="lab_gmab_DefinedContributionPlansPensionObligation" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The amount of pension obligation under defined contribution plan recognised.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_DefinedContributionPlansPensionObligation" xlink:href="gmab-20251231.xsd#gmab_DefinedContributionPlansPensionObligation"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_DefinedContributionPlansPensionObligation" xlink:to="lab_gmab_DefinedContributionPlansPensionObligation" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_PercentageOfShareCapitalRepurchased_6f09ab29-bd7e-4961-a486-9280fefa4f18_periodStartLabel_en-US" xlink:label="lab_gmab_PercentageOfShareCapitalRepurchased" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Proportion of share capital, at beginning of period (in %)</link:label>
    <link:label id="lab_gmab_PercentageOfShareCapitalRepurchased_26234ad3-87d3-4b80-abc0-90d74c160324_periodEndLabel_en-US" xlink:label="lab_gmab_PercentageOfShareCapitalRepurchased" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Proportion of share capital, at end of period (in %)</link:label>
    <link:label id="lab_gmab_PercentageOfShareCapitalRepurchased_019b2cf9-4579-785c-8cbf-468db5c33e53_terseLabel_en-US" xlink:label="lab_gmab_PercentageOfShareCapitalRepurchased" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Percentage of share capital repurchased</link:label>
    <link:label id="lab_gmab_PercentageOfShareCapitalRepurchased_label_en-US" xlink:label="lab_gmab_PercentageOfShareCapitalRepurchased" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Percentage Of Share Capital Repurchased</link:label>
    <link:label id="lab_gmab_PercentageOfShareCapitalRepurchased_documentation_en-US" xlink:label="lab_gmab_PercentageOfShareCapitalRepurchased" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Percentage of share capital repurchased.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_PercentageOfShareCapitalRepurchased" xlink:href="gmab-20251231.xsd#gmab_PercentageOfShareCapitalRepurchased"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_PercentageOfShareCapitalRepurchased" xlink:to="lab_gmab_PercentageOfShareCapitalRepurchased" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_GenmabHoldingIIB.V.Member_019b07a3-b587-78a6-9193-ad5dd2b40bc6_terseLabel_en-US" xlink:label="lab_gmab_GenmabHoldingIIB.V.Member" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Genmab Holding II B.V.</link:label>
    <link:label id="lab_gmab_GenmabHoldingIIB.V.Member_label_en-US" xlink:label="lab_gmab_GenmabHoldingIIB.V.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Genmab Holding II B.V. [Member]</link:label>
    <link:label id="lab_gmab_GenmabHoldingIIB.V.Member_documentation_en-US" xlink:label="lab_gmab_GenmabHoldingIIB.V.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Genmab Holding II B.V.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_GenmabHoldingIIB.V.Member" xlink:href="gmab-20251231.xsd#gmab_GenmabHoldingIIB.V.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_GenmabHoldingIIB.V.Member" xlink:to="lab_gmab_GenmabHoldingIIB.V.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CategoriesOfRelatedPartiesDomain_7394ec21-37c4-4561-b584-2ba04c5ce91a_terseLabel_en-US" xlink:label="lab_ifrs-full_CategoriesOfRelatedPartiesDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Categories of related parties [domain]</link:label>
    <link:label id="lab_ifrs-full_CategoriesOfRelatedPartiesDomain_label_en-US" xlink:label="lab_ifrs-full_CategoriesOfRelatedPartiesDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Categories of related parties [domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfRelatedPartiesDomain" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfRelatedPartiesDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CategoriesOfRelatedPartiesDomain" xlink:to="lab_ifrs-full_CategoriesOfRelatedPartiesDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_StaffCostsIncludedInCostOfProductSales_5476c4e9-1985-4cce-a819-b163288cbe05_terseLabel_en-US" xlink:label="lab_gmab_StaffCostsIncludedInCostOfProductSales" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cost of product sales</link:label>
    <link:label id="lab_gmab_StaffCostsIncludedInCostOfProductSales_label_en-US" xlink:label="lab_gmab_StaffCostsIncludedInCostOfProductSales" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Staff Costs Included In Cost Of Product Sales</link:label>
    <link:label id="lab_gmab_StaffCostsIncludedInCostOfProductSales_documentation_en-US" xlink:label="lab_gmab_StaffCostsIncludedInCostOfProductSales" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The amount of staff cost included in cost of product sales.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_StaffCostsIncludedInCostOfProductSales" xlink:href="gmab-20251231.xsd#gmab_StaffCostsIncludedInCostOfProductSales"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_StaffCostsIncludedInCostOfProductSales" xlink:to="lab_gmab_StaffCostsIncludedInCostOfProductSales" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForCashFlowsExplanatory_019bbbcf-d1fe-7f0e-b7f4-e6a52f831457_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForCashFlowsExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Statements of Cash Flows</link:label>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForCashFlowsExplanatory_label_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForCashFlowsExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Description of accounting policy for cash flows [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForCashFlowsExplanatory" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DescriptionOfAccountingPolicyForCashFlowsExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DescriptionOfAccountingPolicyForCashFlowsExplanatory" xlink:to="lab_ifrs-full_DescriptionOfAccountingPolicyForCashFlowsExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_PeriodThreeMember_019c5221-c506-7fce-97d6-ee1cf9e67188_terseLabel_en-US" xlink:label="lab_gmab_PeriodThreeMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Period three</link:label>
    <link:label id="lab_gmab_PeriodThreeMember_label_en-US" xlink:label="lab_gmab_PeriodThreeMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Period Three [Member]</link:label>
    <link:label id="lab_gmab_PeriodThreeMember_documentation_en-US" xlink:label="lab_gmab_PeriodThreeMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Period Three</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_PeriodThreeMember" xlink:href="gmab-20251231.xsd#gmab_PeriodThreeMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_PeriodThreeMember" xlink:to="lab_gmab_PeriodThreeMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_PerformanceObligationsSatisfiedOverTimeMember_688ca845-1da1-4996-9546-593bf950e6ef_terseLabel_en-US" xlink:label="lab_ifrs-full_PerformanceObligationsSatisfiedOverTimeMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Performance obligations satisfied over time</link:label>
    <link:label id="lab_ifrs-full_PerformanceObligationsSatisfiedOverTimeMember_label_en-US" xlink:label="lab_ifrs-full_PerformanceObligationsSatisfiedOverTimeMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Performance obligations satisfied over time [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PerformanceObligationsSatisfiedOverTimeMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PerformanceObligationsSatisfiedOverTimeMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_PerformanceObligationsSatisfiedOverTimeMember" xlink:to="lab_ifrs-full_PerformanceObligationsSatisfiedOverTimeMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfBusinessCombinationsTable_66a3a0c0-5e54-41fa-9b92-f0810a1bd17a_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfBusinessCombinationsTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure of detailed information about business combination [table]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfBusinessCombinationsTable_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfBusinessCombinationsTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of detailed information about business combination [table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfBusinessCombinationsTable" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfBusinessCombinationsTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsTable" xlink:to="lab_ifrs-full_DisclosureOfBusinessCombinationsTable" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_WeightedAverageFairValueOfWarrantsGranted_d8d20ba7-567a-4fea-9d6b-65bccb9b2984_terseLabel_en-US" xlink:label="lab_gmab_WeightedAverageFairValueOfWarrantsGranted" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total fair value of warrants granted</link:label>
    <link:label id="lab_gmab_WeightedAverageFairValueOfWarrantsGranted_label_en-US" xlink:label="lab_gmab_WeightedAverageFairValueOfWarrantsGranted" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Weighted Average Fair Value Of Warrants Granted</link:label>
    <link:label id="lab_gmab_WeightedAverageFairValueOfWarrantsGranted_documentation_en-US" xlink:label="lab_gmab_WeightedAverageFairValueOfWarrantsGranted" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Weighted average fair value of warrants granted.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_WeightedAverageFairValueOfWarrantsGranted" xlink:href="gmab-20251231.xsd#gmab_WeightedAverageFairValueOfWarrantsGranted"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_WeightedAverageFairValueOfWarrantsGranted" xlink:to="lab_gmab_WeightedAverageFairValueOfWarrantsGranted" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AdjustmentsForDepreciationExpense_217c8891-f8db-4eaf-aed8-737e790cf5d2_terseLabel_en-US" xlink:label="lab_ifrs-full_AdjustmentsForDepreciationExpense" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Depreciation</link:label>
    <link:label id="lab_ifrs-full_AdjustmentsForDepreciationExpense_label_en-US" xlink:label="lab_ifrs-full_AdjustmentsForDepreciationExpense" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Adjustments for depreciation expense</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForDepreciationExpense" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AdjustmentsForDepreciationExpense"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AdjustmentsForDepreciationExpense" xlink:to="lab_ifrs-full_AdjustmentsForDepreciationExpense" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_AuditorLocation_6a2881c7-dbb2-485a-9155-f939b587921e_terseLabel_en-US" xlink:label="lab_dei_AuditorLocation" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Auditor Location</link:label>
    <link:label id="lab_dei_AuditorLocation_label_en-US" xlink:label="lab_dei_AuditorLocation" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Auditor Location</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AuditorLocation" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AuditorLocation"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_AuditorLocation" xlink:to="lab_dei_AuditorLocation" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_IncreaseDecreaseThroughBusinessCombinationsDeferredTaxLiabilityAsset_019c47fe-f391-72d6-bbb7-58b7931f48ac_terseLabel_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseThroughBusinessCombinationsDeferredTaxLiabilityAsset" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Acquired in Business Combinations</link:label>
    <link:label id="lab_ifrs-full_IncreaseDecreaseThroughBusinessCombinationsDeferredTaxLiabilityAsset_label_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseThroughBusinessCombinationsDeferredTaxLiabilityAsset" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (decrease) through business combinations, deferred tax liability (asset)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughBusinessCombinationsDeferredTaxLiabilityAsset" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseThroughBusinessCombinationsDeferredTaxLiabilityAsset"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_IncreaseDecreaseThroughBusinessCombinationsDeferredTaxLiabilityAsset" xlink:to="lab_ifrs-full_IncreaseDecreaseThroughBusinessCombinationsDeferredTaxLiabilityAsset" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ReductionOfIssuedCapital_019bfc3f-ba79-70b7-932e-487fa73b475d_negatedTerseLabel_en-US" xlink:label="lab_ifrs-full_ReductionOfIssuedCapital" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Share Reduction</link:label>
    <link:label id="lab_ifrs-full_ReductionOfIssuedCapital_019bc604-ac11-7761-a7fe-0c015d192e06_negatedLabel_en-US" xlink:label="lab_ifrs-full_ReductionOfIssuedCapital" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Share capital reduction</link:label>
    <link:label id="lab_ifrs-full_ReductionOfIssuedCapital_019b2d0d-770f-7af1-9baa-85548286aff2_terseLabel_en-US" xlink:label="lab_ifrs-full_ReductionOfIssuedCapital" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share capital reduction</link:label>
    <link:label id="lab_ifrs-full_ReductionOfIssuedCapital_label_en-US" xlink:label="lab_ifrs-full_ReductionOfIssuedCapital" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Reduction of issued capital</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ReductionOfIssuedCapital" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ReductionOfIssuedCapital"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ReductionOfIssuedCapital" xlink:to="lab_ifrs-full_ReductionOfIssuedCapital" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_InterestReceivedClassifiedAsOperatingActivities_e6bb578f-4f0d-4d87-b141-172c257929a1_terseLabel_en-US" xlink:label="lab_ifrs-full_InterestReceivedClassifiedAsOperatingActivities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Interest received</link:label>
    <link:label id="lab_ifrs-full_InterestReceivedClassifiedAsOperatingActivities_label_en-US" xlink:label="lab_ifrs-full_InterestReceivedClassifiedAsOperatingActivities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Interest received, classified as operating activities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InterestReceivedClassifiedAsOperatingActivities" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_InterestReceivedClassifiedAsOperatingActivities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_InterestReceivedClassifiedAsOperatingActivities" xlink:to="lab_ifrs-full_InterestReceivedClassifiedAsOperatingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_StockRepurchaseSecondAuthorizationMember_561adfe8-c301-44ec-89d1-74475ac9220c_terseLabel_en-US" xlink:label="lab_gmab_StockRepurchaseSecondAuthorizationMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Second authorization</link:label>
    <link:label id="lab_gmab_StockRepurchaseSecondAuthorizationMember_label_en-US" xlink:label="lab_gmab_StockRepurchaseSecondAuthorizationMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stock Repurchase Second Authorization [Member]</link:label>
    <link:label id="lab_gmab_StockRepurchaseSecondAuthorizationMember_documentation_en-US" xlink:label="lab_gmab_StockRepurchaseSecondAuthorizationMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the second authorization under the share repurchase arrangement by the board of directors.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_StockRepurchaseSecondAuthorizationMember" xlink:href="gmab-20251231.xsd#gmab_StockRepurchaseSecondAuthorizationMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_StockRepurchaseSecondAuthorizationMember" xlink:to="lab_gmab_StockRepurchaseSecondAuthorizationMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_WeightedAverageShares_a280d035-0f86-4e25-a3f2-ad09d1dda49c_verboseLabel_en-US" xlink:label="lab_ifrs-full_WeightedAverageShares" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Weighted average number of shares outstanding (in shares)</link:label>
    <link:label id="lab_ifrs-full_WeightedAverageShares_label_en-US" xlink:label="lab_ifrs-full_WeightedAverageShares" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Weighted average number of ordinary shares used in calculating basic earnings per share</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_WeightedAverageShares" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_WeightedAverageShares"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_WeightedAverageShares" xlink:to="lab_ifrs-full_WeightedAverageShares" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_ScheduleOfOtherInvestmentsTableTextBlock_019b2108-1856-788d-b58d-4150b15e7244_verboseLabel_en-US" xlink:label="lab_gmab_ScheduleOfOtherInvestmentsTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Schedule of other investments</link:label>
    <link:label id="lab_gmab_ScheduleOfOtherInvestmentsTableTextBlock_label_en-US" xlink:label="lab_gmab_ScheduleOfOtherInvestmentsTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule Of Other Investments [Table Text Block]</link:label>
    <link:label id="lab_gmab_ScheduleOfOtherInvestmentsTableTextBlock_documentation_en-US" xlink:label="lab_gmab_ScheduleOfOtherInvestmentsTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Tabular disclosure of other Investments.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_ScheduleOfOtherInvestmentsTableTextBlock" xlink:href="gmab-20251231.xsd#gmab_ScheduleOfOtherInvestmentsTableTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_ScheduleOfOtherInvestmentsTableTextBlock" xlink:to="lab_gmab_ScheduleOfOtherInvestmentsTableTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_BoardOfDirectorsAndExecutiveManagementMember_adca7381-8fc2-4fff-b460-a75a8d64802e_terseLabel_en-US" xlink:label="lab_gmab_BoardOfDirectorsAndExecutiveManagementMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Board of Directors And Executive Management [Member]</link:label>
    <link:label id="lab_gmab_BoardOfDirectorsAndExecutiveManagementMember_label_en-US" xlink:label="lab_gmab_BoardOfDirectorsAndExecutiveManagementMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Board of Directors And Executive Management [Member]</link:label>
    <link:label id="lab_gmab_BoardOfDirectorsAndExecutiveManagementMember_documentation_en-US" xlink:label="lab_gmab_BoardOfDirectorsAndExecutiveManagementMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents information pertaining to board of directors and executive management.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_BoardOfDirectorsAndExecutiveManagementMember" xlink:href="gmab-20251231.xsd#gmab_BoardOfDirectorsAndExecutiveManagementMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_BoardOfDirectorsAndExecutiveManagementMember" xlink:to="lab_gmab_BoardOfDirectorsAndExecutiveManagementMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_TradingEquitySecuritiesMember_1a0cda76-1d44-4ba2-86f2-b3d584abc361_terseLabel_en-US" xlink:label="lab_ifrs-full_TradingEquitySecuritiesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Publicly traded equity securities</link:label>
    <link:label id="lab_ifrs-full_TradingEquitySecuritiesMember_label_en-US" xlink:label="lab_ifrs-full_TradingEquitySecuritiesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Trading equity securities [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TradingEquitySecuritiesMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TradingEquitySecuritiesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_TradingEquitySecuritiesMember" xlink:to="lab_ifrs-full_TradingEquitySecuritiesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_MaximumExposureToCreditRiskOfReceivables_ade680ef-c323-43b2-9280-0c51a804a51e_terseLabel_en-US" xlink:label="lab_gmab_MaximumExposureToCreditRiskOfReceivables" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Maximum credit exposure to receivables</link:label>
    <link:label id="lab_gmab_MaximumExposureToCreditRiskOfReceivables_label_en-US" xlink:label="lab_gmab_MaximumExposureToCreditRiskOfReceivables" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Maximum Exposure To Credit Risk Of Receivables</link:label>
    <link:label id="lab_gmab_MaximumExposureToCreditRiskOfReceivables_documentation_en-US" xlink:label="lab_gmab_MaximumExposureToCreditRiskOfReceivables" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The maximum exposure to the credit risk of receivables.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_MaximumExposureToCreditRiskOfReceivables" xlink:href="gmab-20251231.xsd#gmab_MaximumExposureToCreditRiskOfReceivables"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_MaximumExposureToCreditRiskOfReceivables" xlink:to="lab_gmab_MaximumExposureToCreditRiskOfReceivables" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ImpairmentLossRecognisedInProfitOrLossGoodwill_e26d447b-6417-4dfb-a83f-acf84e547f1d_terseLabel_en-US" xlink:label="lab_ifrs-full_ImpairmentLossRecognisedInProfitOrLossGoodwill" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Impairment of goodwill</link:label>
    <link:label id="lab_ifrs-full_ImpairmentLossRecognisedInProfitOrLossGoodwill_label_en-US" xlink:label="lab_ifrs-full_ImpairmentLossRecognisedInProfitOrLossGoodwill" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Impairment loss recognised in profit or loss, goodwill</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ImpairmentLossRecognisedInProfitOrLossGoodwill" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ImpairmentLossRecognisedInProfitOrLossGoodwill"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ImpairmentLossRecognisedInProfitOrLossGoodwill" xlink:to="lab_ifrs-full_ImpairmentLossRecognisedInProfitOrLossGoodwill" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_RocheMember_11666627-0883-4d28-a773-22e18e549844_terseLabel_en-US" xlink:label="lab_gmab_RocheMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Roche</link:label>
    <link:label id="lab_gmab_RocheMember_label_en-US" xlink:label="lab_gmab_RocheMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Roche [Member]</link:label>
    <link:label id="lab_gmab_RocheMember_documentation_en-US" xlink:label="lab_gmab_RocheMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This member stands for collaboration arrangement with Roche.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_RocheMember" xlink:href="gmab-20251231.xsd#gmab_RocheMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_RocheMember" xlink:to="lab_gmab_RocheMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ContingentLiabilityForGuaranteesMember_2af03f02-3151-4ff0-b370-74dbca752fe8_terseLabel_en-US" xlink:label="lab_ifrs-full_ContingentLiabilityForGuaranteesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Financial guarantees</link:label>
    <link:label id="lab_ifrs-full_ContingentLiabilityForGuaranteesMember_label_en-US" xlink:label="lab_ifrs-full_ContingentLiabilityForGuaranteesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Contingent liability for guarantees [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ContingentLiabilityForGuaranteesMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ContingentLiabilityForGuaranteesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ContingentLiabilityForGuaranteesMember" xlink:to="lab_ifrs-full_ContingentLiabilityForGuaranteesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_TakahiroHamataniMember_a8f5f79a-6467-4abd-a7ab-3c3ec72224ee_terseLabel_en-US" xlink:label="lab_gmab_TakahiroHamataniMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Takahiro Hamatani</link:label>
    <link:label id="lab_gmab_TakahiroHamataniMember_label_en-US" xlink:label="lab_gmab_TakahiroHamataniMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Takahiro Hamatani [Member]</link:label>
    <link:label id="lab_gmab_TakahiroHamataniMember_documentation_en-US" xlink:label="lab_gmab_TakahiroHamataniMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents information pertaining to Takahiro Hamatani4.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_TakahiroHamataniMember" xlink:href="gmab-20251231.xsd#gmab_TakahiroHamataniMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_TakahiroHamataniMember" xlink:to="lab_gmab_TakahiroHamataniMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfIntangibleAssetsTable_ce9ef990-4afe-4a0b-a340-93e11c8925b8_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfIntangibleAssetsTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure of detailed information about intangible assets [table]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfIntangibleAssetsTable_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfIntangibleAssetsTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of detailed information about intangible assets [table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfIntangibleAssetsTable" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfIntangibleAssetsTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfIntangibleAssetsTable" xlink:to="lab_ifrs-full_DisclosureOfIntangibleAssetsTable" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_OtherReserves_8971ffb7-dbc7-4c92-b591-f015442041c1_terseLabel_en-US" xlink:label="lab_ifrs-full_OtherReserves" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other reserves</link:label>
    <link:label id="lab_ifrs-full_OtherReserves_label_en-US" xlink:label="lab_ifrs-full_OtherReserves" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other reserves</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherReserves" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherReserves"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OtherReserves" xlink:to="lab_ifrs-full_OtherReserves" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_KeyManagementPersonnelCompensationSharebasedPayment_e83b7381-02f2-43f9-8912-acc8ed476695_terseLabel_en-US" xlink:label="lab_ifrs-full_KeyManagementPersonnelCompensationSharebasedPayment" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Defined contribution plans</link:label>
    <link:label id="lab_ifrs-full_KeyManagementPersonnelCompensationSharebasedPayment_20fc8b6f-978a-46d4-9ae6-e1560a5a6aa6_verboseLabel_en-US" xlink:label="lab_ifrs-full_KeyManagementPersonnelCompensationSharebasedPayment" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Share-Based Compensation Expenses</link:label>
    <link:label id="lab_ifrs-full_KeyManagementPersonnelCompensationSharebasedPayment_label_en-US" xlink:label="lab_ifrs-full_KeyManagementPersonnelCompensationSharebasedPayment" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Key management personnel compensation, share-based payment</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_KeyManagementPersonnelCompensationSharebasedPayment" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_KeyManagementPersonnelCompensationSharebasedPayment"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_KeyManagementPersonnelCompensationSharebasedPayment" xlink:to="lab_ifrs-full_KeyManagementPersonnelCompensationSharebasedPayment" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_Borrowings_ea3998d7-bbae-420c-adb3-8e253261893e_terseLabel_en-US" xlink:label="lab_ifrs-full_Borrowings" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Borrowings</link:label>
    <link:label id="lab_ifrs-full_Borrowings_label_en-US" xlink:label="lab_ifrs-full_Borrowings" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Borrowings</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Borrowings" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Borrowings"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_Borrowings" xlink:to="lab_ifrs-full_Borrowings" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_DisclosureOfMarketableSecuritiesByCurrencyTableTextBlock_4a03f71f-ab64-4f27-9f16-edf083427fec_terseLabel_en-US" xlink:label="lab_gmab_DisclosureOfMarketableSecuritiesByCurrencyTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of total marketable securities by currency</link:label>
    <link:label id="lab_gmab_DisclosureOfMarketableSecuritiesByCurrencyTableTextBlock_label_en-US" xlink:label="lab_gmab_DisclosureOfMarketableSecuritiesByCurrencyTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure Of Marketable Securities By Currency [Table Text Block]</link:label>
    <link:label id="lab_gmab_DisclosureOfMarketableSecuritiesByCurrencyTableTextBlock_documentation_en-US" xlink:label="lab_gmab_DisclosureOfMarketableSecuritiesByCurrencyTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Tabular disclosure of marketable securities in foreign currency.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_DisclosureOfMarketableSecuritiesByCurrencyTableTextBlock" xlink:href="gmab-20251231.xsd#gmab_DisclosureOfMarketableSecuritiesByCurrencyTableTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_DisclosureOfMarketableSecuritiesByCurrencyTableTextBlock" xlink:to="lab_gmab_DisclosureOfMarketableSecuritiesByCurrencyTableTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityWellKnownSeasonedIssuer_019b45ad-a863-7c69-953b-fdaa65ab40de_terseLabel_en-US" xlink:label="lab_dei_EntityWellKnownSeasonedIssuer" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Well-known Seasoned Issuer</link:label>
    <link:label id="lab_dei_EntityWellKnownSeasonedIssuer_label_en-US" xlink:label="lab_dei_EntityWellKnownSeasonedIssuer" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Well-known Seasoned Issuer</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityWellKnownSeasonedIssuer" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityWellKnownSeasonedIssuer"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityWellKnownSeasonedIssuer" xlink:to="lab_dei_EntityWellKnownSeasonedIssuer" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_TaxLossesAndCreditsCarriedForwardTemporaryDifferenceMember_019c47ed-b24d-781c-a866-ff085d762d31_terseLabel_en-US" xlink:label="lab_gmab_TaxLossesAndCreditsCarriedForwardTemporaryDifferenceMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Tax losses and credits carried forward</link:label>
    <link:label id="lab_gmab_TaxLossesAndCreditsCarriedForwardTemporaryDifferenceMember_label_en-US" xlink:label="lab_gmab_TaxLossesAndCreditsCarriedForwardTemporaryDifferenceMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Tax Losses And Credits Carried Forward, Temporary Difference [Member]</link:label>
    <link:label id="lab_gmab_TaxLossesAndCreditsCarriedForwardTemporaryDifferenceMember_documentation_en-US" xlink:label="lab_gmab_TaxLossesAndCreditsCarriedForwardTemporaryDifferenceMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Tax Losses And Credits Carried Forward, Temporary Difference</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_TaxLossesAndCreditsCarriedForwardTemporaryDifferenceMember" xlink:href="gmab-20251231.xsd#gmab_TaxLossesAndCreditsCarriedForwardTemporaryDifferenceMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_TaxLossesAndCreditsCarriedForwardTemporaryDifferenceMember" xlink:to="lab_gmab_TaxLossesAndCreditsCarriedForwardTemporaryDifferenceMember" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_SharesUsedForFundingRSUProgram_019bbd0c-8fc5-757d-ba4c-cbea265716a4_negatedLabel_en-US" xlink:label="lab_gmab_SharesUsedForFundingRSUProgram" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Shares used for funding RSU program (in shares)</link:label>
    <link:label id="lab_gmab_SharesUsedForFundingRSUProgram_label_en-US" xlink:label="lab_gmab_SharesUsedForFundingRSUProgram" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Shares Used For Funding RSU Program</link:label>
    <link:label id="lab_gmab_SharesUsedForFundingRSUProgram_documentation_en-US" xlink:label="lab_gmab_SharesUsedForFundingRSUProgram" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Number of treasury shares sold.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_SharesUsedForFundingRSUProgram" xlink:href="gmab-20251231.xsd#gmab_SharesUsedForFundingRSUProgram"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_SharesUsedForFundingRSUProgram" xlink:to="lab_gmab_SharesUsedForFundingRSUProgram" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ShorttermInvestmentsClassifiedAsCashEquivalents_31a9936d-c1b3-4284-9e1f-8b50cdb1953e_terseLabel_en-US" xlink:label="lab_ifrs-full_ShorttermInvestmentsClassifiedAsCashEquivalents" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Short-term marketable securities</link:label>
    <link:label id="lab_ifrs-full_ShorttermInvestmentsClassifiedAsCashEquivalents_label_en-US" xlink:label="lab_ifrs-full_ShorttermInvestmentsClassifiedAsCashEquivalents" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Short-term investments, classified as cash equivalents</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ShorttermInvestmentsClassifiedAsCashEquivalents" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ShorttermInvestmentsClassifiedAsCashEquivalents"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ShorttermInvestmentsClassifiedAsCashEquivalents" xlink:to="lab_ifrs-full_ShorttermInvestmentsClassifiedAsCashEquivalents" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_MarketableSecuritiesMember_c3b5f322-9545-4804-9689-d5a4c7c635b8_terseLabel_en-US" xlink:label="lab_gmab_MarketableSecuritiesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Marketable securities</link:label>
    <link:label id="lab_gmab_MarketableSecuritiesMember_label_en-US" xlink:label="lab_gmab_MarketableSecuritiesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Marketable Securities [Member]</link:label>
    <link:label id="lab_gmab_MarketableSecuritiesMember_documentation_en-US" xlink:label="lab_gmab_MarketableSecuritiesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This member stands for marketable securities .</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_MarketableSecuritiesMember" xlink:href="gmab-20251231.xsd#gmab_MarketableSecuritiesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_MarketableSecuritiesMember" xlink:to="lab_gmab_MarketableSecuritiesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_ProfessionalFeesRelatedToAcquisitions_019c4833-a9e4-7507-abc2-4ac6ce8aaa53_terseLabel_en-US" xlink:label="lab_gmab_ProfessionalFeesRelatedToAcquisitions" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Professional fees related to acquisition</link:label>
    <link:label id="lab_gmab_ProfessionalFeesRelatedToAcquisitions_label_en-US" xlink:label="lab_gmab_ProfessionalFeesRelatedToAcquisitions" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Professional Fees Related To Acquisitions</link:label>
    <link:label id="lab_gmab_ProfessionalFeesRelatedToAcquisitions_documentation_en-US" xlink:label="lab_gmab_ProfessionalFeesRelatedToAcquisitions" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Professional Fees Related To Acquisitions</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_ProfessionalFeesRelatedToAcquisitions" xlink:href="gmab-20251231.xsd#gmab_ProfessionalFeesRelatedToAcquisitions"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_ProfessionalFeesRelatedToAcquisitions" xlink:to="lab_gmab_ProfessionalFeesRelatedToAcquisitions" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_GenmabUKLtdMember_019b07a7-5975-7a34-aed3-e51aa699f41f_terseLabel_en-US" xlink:label="lab_gmab_GenmabUKLtdMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Genmab UK Ltd</link:label>
    <link:label id="lab_gmab_GenmabUKLtdMember_label_en-US" xlink:label="lab_gmab_GenmabUKLtdMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Genmab UK Ltd [Member]</link:label>
    <link:label id="lab_gmab_GenmabUKLtdMember_documentation_en-US" xlink:label="lab_gmab_GenmabUKLtdMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Genmab UK Ltd</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_GenmabUKLtdMember" xlink:href="gmab-20251231.xsd#gmab_GenmabUKLtdMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_GenmabUKLtdMember" xlink:to="lab_gmab_GenmabUKLtdMember" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_BasicBoardFee_600681ac-302c-4bb4-880e-c9a38faa354f_terseLabel_en-US" xlink:label="lab_gmab_BasicBoardFee" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Base Board Fee</link:label>
    <link:label id="lab_gmab_BasicBoardFee_label_en-US" xlink:label="lab_gmab_BasicBoardFee" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Basic Board Fee</link:label>
    <link:label id="lab_gmab_BasicBoardFee_documentation_en-US" xlink:label="lab_gmab_BasicBoardFee" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The amount of expense relating to basic board fee.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_BasicBoardFee" xlink:href="gmab-20251231.xsd#gmab_BasicBoardFee"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_BasicBoardFee" xlink:to="lab_gmab_BasicBoardFee" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CashFlowsFromUsedInFinancingActivities_ea66f9ee-e706-43ca-b8ca-4e4e5ec72bd0_totalLabel_en-US" xlink:label="lab_ifrs-full_CashFlowsFromUsedInFinancingActivities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net cash provided by (used in) financing activities</link:label>
    <link:label id="lab_ifrs-full_CashFlowsFromUsedInFinancingActivities_019bbbb6-2341-7bd1-9863-4cd3dea20fe0_verboseLabel_en-US" xlink:label="lab_ifrs-full_CashFlowsFromUsedInFinancingActivities" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Financing activities</link:label>
    <link:label id="lab_ifrs-full_CashFlowsFromUsedInFinancingActivities_label_en-US" xlink:label="lab_ifrs-full_CashFlowsFromUsedInFinancingActivities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash flows from (used in) financing activities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInFinancingActivities" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CashFlowsFromUsedInFinancingActivities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CashFlowsFromUsedInFinancingActivities" xlink:to="lab_ifrs-full_CashFlowsFromUsedInFinancingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_NumberOfPerformanceObligations_f712eb83-9057-475c-affc-ed6b7019d797_terseLabel_en-US" xlink:label="lab_gmab_NumberOfPerformanceObligations" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of performance obligations</link:label>
    <link:label id="lab_gmab_NumberOfPerformanceObligations_label_en-US" xlink:label="lab_gmab_NumberOfPerformanceObligations" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number of Performance Obligations</link:label>
    <link:label id="lab_gmab_NumberOfPerformanceObligations_documentation_en-US" xlink:label="lab_gmab_NumberOfPerformanceObligations" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the number of performance obligations.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_NumberOfPerformanceObligations" xlink:href="gmab-20251231.xsd#gmab_NumberOfPerformanceObligations"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_NumberOfPerformanceObligations" xlink:to="lab_gmab_NumberOfPerformanceObligations" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_ContractLiabilitiesRevenueRecognizedDuringPeriod_37e2b448-bdae-4db4-ac88-c6ff5a1113a2_negatedLabel_en-US" xlink:label="lab_gmab_ContractLiabilitiesRevenueRecognizedDuringPeriod" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Revenue recognized during the year</link:label>
    <link:label id="lab_gmab_ContractLiabilitiesRevenueRecognizedDuringPeriod_label_en-US" xlink:label="lab_gmab_ContractLiabilitiesRevenueRecognizedDuringPeriod" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Contract Liabilities, Revenue Recognized During Period</link:label>
    <link:label id="lab_gmab_ContractLiabilitiesRevenueRecognizedDuringPeriod_documentation_en-US" xlink:label="lab_gmab_ContractLiabilitiesRevenueRecognizedDuringPeriod" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The amount of revenue that was recognized during the year from contract liability.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_ContractLiabilitiesRevenueRecognizedDuringPeriod" xlink:href="gmab-20251231.xsd#gmab_ContractLiabilitiesRevenueRecognizedDuringPeriod"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_ContractLiabilitiesRevenueRecognizedDuringPeriod" xlink:to="lab_gmab_ContractLiabilitiesRevenueRecognizedDuringPeriod" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_CashTransferredForOutstandingEquityAwardsForSettlementOfNonVestedAwards_f05d9ab0-30f9-435d-a02d-654d329baaa7_terseLabel_en-US" xlink:label="lab_gmab_CashTransferredForOutstandingEquityAwardsForSettlementOfNonVestedAwards" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash payment related to the portion of awards with future vesting conditions</link:label>
    <link:label id="lab_gmab_CashTransferredForOutstandingEquityAwardsForSettlementOfNonVestedAwards_label_en-US" xlink:label="lab_gmab_CashTransferredForOutstandingEquityAwardsForSettlementOfNonVestedAwards" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash Transferred for Outstanding Equity Awards for Settlement of Non-Vested Awards</link:label>
    <link:label id="lab_gmab_CashTransferredForOutstandingEquityAwardsForSettlementOfNonVestedAwards_documentation_en-US" xlink:label="lab_gmab_CashTransferredForOutstandingEquityAwardsForSettlementOfNonVestedAwards" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The fair value, at acquisition date, of cash transferred for outstanding equity awards for settlement related to the portion of awards with future vesting conditions, and therefore attributable to post-combination services as consideration in a business combination.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_CashTransferredForOutstandingEquityAwardsForSettlementOfNonVestedAwards" xlink:href="gmab-20251231.xsd#gmab_CashTransferredForOutstandingEquityAwardsForSettlementOfNonVestedAwards"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_CashTransferredForOutstandingEquityAwardsForSettlementOfNonVestedAwards" xlink:to="lab_gmab_CashTransferredForOutstandingEquityAwardsForSettlementOfNonVestedAwards" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForEarningsPerShareExplanatory_019b0840-a709-7049-9f75-cec8303a071a_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForEarningsPerShareExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Basic and Diluted Net Profit Per Share</link:label>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForEarningsPerShareExplanatory_label_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForEarningsPerShareExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Description of accounting policy for earnings per share [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForEarningsPerShareExplanatory" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DescriptionOfAccountingPolicyForEarningsPerShareExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DescriptionOfAccountingPolicyForEarningsPerShareExplanatory" xlink:to="lab_ifrs-full_DescriptionOfAccountingPolicyForEarningsPerShareExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_DeferredRevenueTemporaryDifferencesMember_a0991da0-57b2-4a0b-b1f0-d30690573be1_terseLabel_en-US" xlink:label="lab_gmab_DeferredRevenueTemporaryDifferencesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Deferred revenue</link:label>
    <link:label id="lab_gmab_DeferredRevenueTemporaryDifferencesMember_label_en-US" xlink:label="lab_gmab_DeferredRevenueTemporaryDifferencesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deferred Revenue, Temporary Differences [Member]</link:label>
    <link:label id="lab_gmab_DeferredRevenueTemporaryDifferencesMember_documentation_en-US" xlink:label="lab_gmab_DeferredRevenueTemporaryDifferencesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This member stands for deferred revenue.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_DeferredRevenueTemporaryDifferencesMember" xlink:href="gmab-20251231.xsd#gmab_DeferredRevenueTemporaryDifferencesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_DeferredRevenueTemporaryDifferencesMember" xlink:to="lab_gmab_DeferredRevenueTemporaryDifferencesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_DescriptionOfAccountingPolicyForCollaborationsLicenseAgreementsAndCollaborativeAgreementsPolicyTextBlock_019c5166-1028-7296-b48e-65126ffd00b9_terseLabel_en-US" xlink:label="lab_gmab_DescriptionOfAccountingPolicyForCollaborationsLicenseAgreementsAndCollaborativeAgreementsPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Collaborations, License Agreements and Collaborative Agreements</link:label>
    <link:label id="lab_gmab_DescriptionOfAccountingPolicyForCollaborationsLicenseAgreementsAndCollaborativeAgreementsPolicyTextBlock_label_en-US" xlink:label="lab_gmab_DescriptionOfAccountingPolicyForCollaborationsLicenseAgreementsAndCollaborativeAgreementsPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Description Of Accounting Policy For Collaborations, License Agreements And Collaborative Agreements [Policy Text Block]</link:label>
    <link:label id="lab_gmab_DescriptionOfAccountingPolicyForCollaborationsLicenseAgreementsAndCollaborativeAgreementsPolicyTextBlock_documentation_en-US" xlink:label="lab_gmab_DescriptionOfAccountingPolicyForCollaborationsLicenseAgreementsAndCollaborativeAgreementsPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Description Of Accounting Policy For Collaborations, License Agreements And Collaborative Agreements</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_DescriptionOfAccountingPolicyForCollaborationsLicenseAgreementsAndCollaborativeAgreementsPolicyTextBlock" xlink:href="gmab-20251231.xsd#gmab_DescriptionOfAccountingPolicyForCollaborationsLicenseAgreementsAndCollaborativeAgreementsPolicyTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_DescriptionOfAccountingPolicyForCollaborationsLicenseAgreementsAndCollaborativeAgreementsPolicyTextBlock" xlink:to="lab_gmab_DescriptionOfAccountingPolicyForCollaborationsLicenseAgreementsAndCollaborativeAgreementsPolicyTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AccumulatedDepreciationAmortisationAndImpairmentMember_9f8d769e-36d0-446c-a41b-1a890b54897d_terseLabel_en-US" xlink:label="lab_ifrs-full_AccumulatedDepreciationAmortisationAndImpairmentMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accumulated amortization and impairment</link:label>
    <link:label id="lab_ifrs-full_AccumulatedDepreciationAmortisationAndImpairmentMember_label_en-US" xlink:label="lab_ifrs-full_AccumulatedDepreciationAmortisationAndImpairmentMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accumulated depreciation, amortisation and impairment [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AccumulatedDepreciationAmortisationAndImpairmentMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AccumulatedDepreciationAmortisationAndImpairmentMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AccumulatedDepreciationAmortisationAndImpairmentMember" xlink:to="lab_ifrs-full_AccumulatedDepreciationAmortisationAndImpairmentMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityCurrentReportingStatus_019b45ae-c122-7a9f-aa62-c6a0945478be_terseLabel_en-US" xlink:label="lab_dei_EntityCurrentReportingStatus" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Current Reporting Status</link:label>
    <link:label id="lab_dei_EntityCurrentReportingStatus_label_en-US" xlink:label="lab_dei_EntityCurrentReportingStatus" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Current Reporting Status</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCurrentReportingStatus" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCurrentReportingStatus"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityCurrentReportingStatus" xlink:to="lab_dei_EntityCurrentReportingStatus" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_CostOfTreasurySharesUsedForFundingProgramAtCost_019c5103-ca87-7278-82e3-4a2162820daf_negatedTerseLabel_en-US" xlink:label="lab_gmab_CostOfTreasurySharesUsedForFundingProgramAtCost" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Shares used for funding RSU program</link:label>
    <link:label id="lab_gmab_CostOfTreasurySharesUsedForFundingProgramAtCost_label_en-US" xlink:label="lab_gmab_CostOfTreasurySharesUsedForFundingProgramAtCost" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cost Of Treasury Shares Used For Funding Program, At Cost</link:label>
    <link:label id="lab_gmab_CostOfTreasurySharesUsedForFundingProgramAtCost_documentation_en-US" xlink:label="lab_gmab_CostOfTreasurySharesUsedForFundingProgramAtCost" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Cost of treasury shares used for funding RSU program.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_CostOfTreasurySharesUsedForFundingProgramAtCost" xlink:href="gmab-20251231.xsd#gmab_CostOfTreasurySharesUsedForFundingProgramAtCost"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_CostOfTreasurySharesUsedForFundingProgramAtCost" xlink:to="lab_gmab_CostOfTreasurySharesUsedForFundingProgramAtCost" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_LaterThanOneYearAndNotLaterThanThreeYearsMember_a9655270-b487-4225-940c-c39cb456d8cc_terseLabel_en-US" xlink:label="lab_ifrs-full_LaterThanOneYearAndNotLaterThanThreeYearsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">1 &#8211; 3 years</link:label>
    <link:label id="lab_ifrs-full_LaterThanOneYearAndNotLaterThanThreeYearsMember_label_en-US" xlink:label="lab_ifrs-full_LaterThanOneYearAndNotLaterThanThreeYearsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Later than one year and not later than three years [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LaterThanOneYearAndNotLaterThanThreeYearsMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LaterThanOneYearAndNotLaterThanThreeYearsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_LaterThanOneYearAndNotLaterThanThreeYearsMember" xlink:to="lab_ifrs-full_LaterThanOneYearAndNotLaterThanThreeYearsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfDeferredTaxesExplanatory_90bd1101-e804-42c1-908b-5eb7a4e06c07_verboseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfDeferredTaxesExplanatory" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Schedule of components of the deferred tax asset</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfDeferredTaxesExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfDeferredTaxesExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of deferred taxes [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfDeferredTaxesExplanatory" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfDeferredTaxesExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfDeferredTaxesExplanatory" xlink:to="lab_ifrs-full_DisclosureOfDeferredTaxesExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_StatementOfChangesInEquityTable_b3237dea-4801-40bc-9cc5-b6ad8a686856_terseLabel_en-US" xlink:label="lab_ifrs-full_StatementOfChangesInEquityTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Statement of changes in equity [table]</link:label>
    <link:label id="lab_ifrs-full_StatementOfChangesInEquityTable_label_en-US" xlink:label="lab_ifrs-full_StatementOfChangesInEquityTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Statement of changes in equity [table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_StatementOfChangesInEquityTable" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_StatementOfChangesInEquityTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_StatementOfChangesInEquityTable" xlink:to="lab_ifrs-full_StatementOfChangesInEquityTable" xlink:type="arc" order="1"/>
    <link:label id="lab_country_JP_7916f435-fef9-4502-982c-3182800cfe40_terseLabel_en-US" xlink:label="lab_country_JP" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Japan</link:label>
    <link:label id="lab_country_JP_label_en-US" xlink:label="lab_country_JP" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">JAPAN</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_country_JP" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_JP"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_country_JP" xlink:to="lab_country_JP" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_AbbVieRinaSTradeSecretComplaintMember_019b2246-d145-74e5-ac84-45a8d5badec6_terseLabel_en-US" xlink:label="lab_gmab_AbbVieRinaSTradeSecretComplaintMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">AbbVie Rina-S Trade Secret Complaint</link:label>
    <link:label id="lab_gmab_AbbVieRinaSTradeSecretComplaintMember_label_en-US" xlink:label="lab_gmab_AbbVieRinaSTradeSecretComplaintMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">AbbVie Rina-S Trade Secret Complaint [Member]</link:label>
    <link:label id="lab_gmab_AbbVieRinaSTradeSecretComplaintMember_documentation_en-US" xlink:label="lab_gmab_AbbVieRinaSTradeSecretComplaintMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">AbbVie Rina-S Trade Secret Complaint</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_AbbVieRinaSTradeSecretComplaintMember" xlink:href="gmab-20251231.xsd#gmab_AbbVieRinaSTradeSecretComplaintMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_AbbVieRinaSTradeSecretComplaintMember" xlink:to="lab_gmab_AbbVieRinaSTradeSecretComplaintMember" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_DKKPortfolioMember_244aacc7-1329-48ea-8b54-c7dc9a03386f_terseLabel_en-US" xlink:label="lab_gmab_DKKPortfolioMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">DKK portfolio</link:label>
    <link:label id="lab_gmab_DKKPortfolioMember_label_en-US" xlink:label="lab_gmab_DKKPortfolioMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">DKK Portfolio [Member]</link:label>
    <link:label id="lab_gmab_DKKPortfolioMember_documentation_en-US" xlink:label="lab_gmab_DKKPortfolioMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This member stands for DKK Portfolio.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_DKKPortfolioMember" xlink:href="gmab-20251231.xsd#gmab_DKKPortfolioMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_DKKPortfolioMember" xlink:to="lab_gmab_DKKPortfolioMember" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_PurchaseOfTreasurySharesAtCost_a79ed2fd-d578-43a4-b409-b04391f88d5c_terseLabel_en-US" xlink:label="lab_gmab_PurchaseOfTreasurySharesAtCost" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Purchase of treasury shares</link:label>
    <link:label id="lab_gmab_PurchaseOfTreasurySharesAtCost_label_en-US" xlink:label="lab_gmab_PurchaseOfTreasurySharesAtCost" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Purchase of Treasury Shares, At cost</link:label>
    <link:label id="lab_gmab_PurchaseOfTreasurySharesAtCost_documentation_en-US" xlink:label="lab_gmab_PurchaseOfTreasurySharesAtCost" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Value of treasury shares purchased.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_PurchaseOfTreasurySharesAtCost" xlink:href="gmab-20251231.xsd#gmab_PurchaseOfTreasurySharesAtCost"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_PurchaseOfTreasurySharesAtCost" xlink:to="lab_gmab_PurchaseOfTreasurySharesAtCost" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_PeriodOneMember_019c5221-694c-7f43-b32d-28735aa49066_terseLabel_en-US" xlink:label="lab_gmab_PeriodOneMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Period one</link:label>
    <link:label id="lab_gmab_PeriodOneMember_label_en-US" xlink:label="lab_gmab_PeriodOneMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Period One [Member]</link:label>
    <link:label id="lab_gmab_PeriodOneMember_documentation_en-US" xlink:label="lab_gmab_PeriodOneMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">First</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_PeriodOneMember" xlink:href="gmab-20251231.xsd#gmab_PeriodOneMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_PeriodOneMember" xlink:to="lab_gmab_PeriodOneMember" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_UpfrontMilestonePaymentReceived_75f5a471-045c-4d18-bc13-059a041f64b3_terseLabel_en-US" xlink:label="lab_gmab_UpfrontMilestonePaymentReceived" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Upfront payment</link:label>
    <link:label id="lab_gmab_UpfrontMilestonePaymentReceived_label_en-US" xlink:label="lab_gmab_UpfrontMilestonePaymentReceived" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Upfront Milestone Payment Received</link:label>
    <link:label id="lab_gmab_UpfrontMilestonePaymentReceived_documentation_en-US" xlink:label="lab_gmab_UpfrontMilestonePaymentReceived" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The amount of cash in flow from upfront milestone payments.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_UpfrontMilestonePaymentReceived" xlink:href="gmab-20251231.xsd#gmab_UpfrontMilestonePaymentReceived"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_UpfrontMilestonePaymentReceived" xlink:to="lab_gmab_UpfrontMilestonePaymentReceived" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_OtherCurrentLiabilitiesRecognisedAsOfAcquisitionDate_019bbc6f-2a15-7b9f-ba69-e56dde661800_negatedTerseLabel_en-US" xlink:label="lab_gmab_OtherCurrentLiabilitiesRecognisedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Other current liabilities</link:label>
    <link:label id="lab_gmab_OtherCurrentLiabilitiesRecognisedAsOfAcquisitionDate_label_en-US" xlink:label="lab_gmab_OtherCurrentLiabilitiesRecognisedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Current Liabilities Recognised As Of Acquisition Date</link:label>
    <link:label id="lab_gmab_OtherCurrentLiabilitiesRecognisedAsOfAcquisitionDate_documentation_en-US" xlink:label="lab_gmab_OtherCurrentLiabilitiesRecognisedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The amount recognised as of the acquisition date for other current liabilities acquired in a business combination.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_OtherCurrentLiabilitiesRecognisedAsOfAcquisitionDate" xlink:href="gmab-20251231.xsd#gmab_OtherCurrentLiabilitiesRecognisedAsOfAcquisitionDate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_OtherCurrentLiabilitiesRecognisedAsOfAcquisitionDate" xlink:to="lab_gmab_OtherCurrentLiabilitiesRecognisedAsOfAcquisitionDate" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CurrentBorrowingsAndCurrentPortionOfNoncurrentBorrowings_019bbb9a-8c15-7ebf-8564-b41b03657c9f_verboseLabel_en-US" xlink:label="lab_ifrs-full_CurrentBorrowingsAndCurrentPortionOfNoncurrentBorrowings" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Borrowings</link:label>
    <link:label id="lab_ifrs-full_CurrentBorrowingsAndCurrentPortionOfNoncurrentBorrowings_019b27ca-d834-7caa-8883-039e08d80fda_terseLabel_en-US" xlink:label="lab_ifrs-full_CurrentBorrowingsAndCurrentPortionOfNoncurrentBorrowings" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Current</link:label>
    <link:label id="lab_ifrs-full_CurrentBorrowingsAndCurrentPortionOfNoncurrentBorrowings_label_en-US" xlink:label="lab_ifrs-full_CurrentBorrowingsAndCurrentPortionOfNoncurrentBorrowings" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Current borrowings and current portion of non-current borrowings</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentBorrowingsAndCurrentPortionOfNoncurrentBorrowings" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CurrentBorrowingsAndCurrentPortionOfNoncurrentBorrowings"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CurrentBorrowingsAndCurrentPortionOfNoncurrentBorrowings" xlink:to="lab_ifrs-full_CurrentBorrowingsAndCurrentPortionOfNoncurrentBorrowings" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CostOfSales_70d94ee0-cdc4-491d-a771-8a02b3d8cb4c_negatedLabel_en-US" xlink:label="lab_ifrs-full_CostOfSales" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Cost of product sales</link:label>
    <link:label id="lab_ifrs-full_CostOfSales_label_en-US" xlink:label="lab_ifrs-full_CostOfSales" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cost of sales</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CostOfSales" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CostOfSales"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CostOfSales" xlink:to="lab_ifrs-full_CostOfSales" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_LineOfCreditFacilityMaximumBorrowingCapacity1_57c3abf0-6304-430a-9c3d-9990cb75a5f5_terseLabel_en-US" xlink:label="lab_gmab_LineOfCreditFacilityMaximumBorrowingCapacity1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Credit facility, maximum borrowing capacity</link:label>
    <link:label id="lab_gmab_LineOfCreditFacilityMaximumBorrowingCapacity1_label_en-US" xlink:label="lab_gmab_LineOfCreditFacilityMaximumBorrowingCapacity1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Line Of Credit Facility, Maximum Borrowing Capacity1</link:label>
    <link:label id="lab_gmab_LineOfCreditFacilityMaximumBorrowingCapacity1_documentation_en-US" xlink:label="lab_gmab_LineOfCreditFacilityMaximumBorrowingCapacity1" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_LineOfCreditFacilityMaximumBorrowingCapacity1" xlink:href="gmab-20251231.xsd#gmab_LineOfCreditFacilityMaximumBorrowingCapacity1"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_LineOfCreditFacilityMaximumBorrowingCapacity1" xlink:to="lab_gmab_LineOfCreditFacilityMaximumBorrowingCapacity1" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ClassesOfAssetsDomain_019bc5c4-4fc6-740e-92f9-26a66e47abc2_terseLabel_en-US" xlink:label="lab_ifrs-full_ClassesOfAssetsDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Classes of assets [domain]</link:label>
    <link:label id="lab_ifrs-full_ClassesOfAssetsDomain_label_en-US" xlink:label="lab_ifrs-full_ClassesOfAssetsDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Classes of assets [domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfAssetsDomain" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfAssetsDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ClassesOfAssetsDomain" xlink:to="lab_ifrs-full_ClassesOfAssetsDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_CurrentFiscalYearEndDate_3dfb02de-f8a0-4a27-b0c2-28fecf6cdba6_terseLabel_en-US" xlink:label="lab_dei_CurrentFiscalYearEndDate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Current Fiscal Year End Date</link:label>
    <link:label id="lab_dei_CurrentFiscalYearEndDate_label_en-US" xlink:label="lab_dei_CurrentFiscalYearEndDate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Current Fiscal Year End Date</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CurrentFiscalYearEndDate" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CurrentFiscalYearEndDate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_CurrentFiscalYearEndDate" xlink:to="lab_dei_CurrentFiscalYearEndDate" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_UKGovernmentBondsAndTreasuryBillsMember_e5400576-6f36-415b-81ea-f49c57972b8b_terseLabel_en-US" xlink:label="lab_gmab_UKGovernmentBondsAndTreasuryBillsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">UK government bonds and treasury bills</link:label>
    <link:label id="lab_gmab_UKGovernmentBondsAndTreasuryBillsMember_label_en-US" xlink:label="lab_gmab_UKGovernmentBondsAndTreasuryBillsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">UK Government Bonds And Treasury Bills [Member]</link:label>
    <link:label id="lab_gmab_UKGovernmentBondsAndTreasuryBillsMember_documentation_en-US" xlink:label="lab_gmab_UKGovernmentBondsAndTreasuryBillsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This member stands for UK government bonds and treasury bills.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_UKGovernmentBondsAndTreasuryBillsMember" xlink:href="gmab-20251231.xsd#gmab_UKGovernmentBondsAndTreasuryBillsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_UKGovernmentBondsAndTreasuryBillsMember" xlink:to="lab_gmab_UKGovernmentBondsAndTreasuryBillsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_BottomOfRangeMember_84281b3b-1a55-483e-bf0a-363a2dc892d0_terseLabel_en-US" xlink:label="lab_ifrs-full_BottomOfRangeMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Bottom of range</link:label>
    <link:label id="lab_ifrs-full_BottomOfRangeMember_label_en-US" xlink:label="lab_ifrs-full_BottomOfRangeMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Bottom of range [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BottomOfRangeMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BottomOfRangeMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_BottomOfRangeMember" xlink:to="lab_ifrs-full_BottomOfRangeMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CategoriesOfRelatedPartiesAxis_3cd8461c-eecd-4c4b-b411-cd8088d3a726_terseLabel_en-US" xlink:label="lab_ifrs-full_CategoriesOfRelatedPartiesAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Categories of related parties [axis]</link:label>
    <link:label id="lab_ifrs-full_CategoriesOfRelatedPartiesAxis_label_en-US" xlink:label="lab_ifrs-full_CategoriesOfRelatedPartiesAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Categories of related parties [axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfRelatedPartiesAxis" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfRelatedPartiesAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CategoriesOfRelatedPartiesAxis" xlink:to="lab_ifrs-full_CategoriesOfRelatedPartiesAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_FinancialLiabilitiesAtAmortisedCostCategoryMember_7cafca78-c7d3-48cf-995b-0b69a7ea7769_terseLabel_en-US" xlink:label="lab_ifrs-full_FinancialLiabilitiesAtAmortisedCostCategoryMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Financial liabilities measured at amortized cost</link:label>
    <link:label id="lab_ifrs-full_FinancialLiabilitiesAtAmortisedCostCategoryMember_label_en-US" xlink:label="lab_ifrs-full_FinancialLiabilitiesAtAmortisedCostCategoryMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Financial liabilities at amortised cost, category [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialLiabilitiesAtAmortisedCostCategoryMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialLiabilitiesAtAmortisedCostCategoryMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_FinancialLiabilitiesAtAmortisedCostCategoryMember" xlink:to="lab_ifrs-full_FinancialLiabilitiesAtAmortisedCostCategoryMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_ab26bf6c-1b93-40bb-8304-d2af7d858656_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure of detailed information about borrowings [line items]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of detailed information about borrowings [line items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems"/>
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    <link:label id="lab_ifrs-full_ProfitLoss_983dddfa-d309-4e6c-98a4-0b9b6d3b1d31_totalLabel_en-US" xlink:label="lab_ifrs-full_ProfitLoss" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net profit</link:label>
    <link:label id="lab_ifrs-full_ProfitLoss_ea0dfbf9-9704-4cb9-93c7-5e3c04e127c3_terseLabel_en-US" xlink:label="lab_ifrs-full_ProfitLoss" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net profit</link:label>
    <link:label id="lab_ifrs-full_ProfitLoss_label_en-US" xlink:label="lab_ifrs-full_ProfitLoss" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Profit (loss)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProfitLoss" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProfitLoss"/>
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    <link:label id="lab_ifrs-full_FinancialAssets_019b2c43-d64f-725c-8daf-ca0c4dff2842_terseLabel_en-US" xlink:label="lab_ifrs-full_FinancialAssets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Financial assets</link:label>
    <link:label id="lab_ifrs-full_FinancialAssets_f9295e28-d1a0-4a01-94ab-3e4d49499b08_periodStartLabel_en-US" xlink:label="lab_ifrs-full_FinancialAssets" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Fair value at beginning of period</link:label>
    <link:label id="lab_ifrs-full_FinancialAssets_e029d93a-c7da-43b9-9c46-436daf4a7d9a_periodEndLabel_en-US" xlink:label="lab_ifrs-full_FinancialAssets" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Fair value at end of period</link:label>
    <link:label id="lab_ifrs-full_FinancialAssets_label_en-US" xlink:label="lab_ifrs-full_FinancialAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Financial assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialAssets" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_FinancialAssets" xlink:to="lab_ifrs-full_FinancialAssets" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_ProportionOfOwnershipInterestAndVotingRightsInSubsidiary_f8055b0b-3ed7-488e-a455-27a5f9a1328a_terseLabel_en-US" xlink:label="lab_gmab_ProportionOfOwnershipInterestAndVotingRightsInSubsidiary" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Ownership and votes (Percentage)</link:label>
    <link:label id="lab_gmab_ProportionOfOwnershipInterestAndVotingRightsInSubsidiary_label_en-US" xlink:label="lab_gmab_ProportionOfOwnershipInterestAndVotingRightsInSubsidiary" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proportion Of Ownership Interest And Voting Rights In Subsidiary</link:label>
    <link:label id="lab_gmab_ProportionOfOwnershipInterestAndVotingRightsInSubsidiary_documentation_en-US" xlink:label="lab_gmab_ProportionOfOwnershipInterestAndVotingRightsInSubsidiary" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The proportion of ownership interest and voting rights in a subsidiary attributable to the entity</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_ProportionOfOwnershipInterestAndVotingRightsInSubsidiary" xlink:href="gmab-20251231.xsd#gmab_ProportionOfOwnershipInterestAndVotingRightsInSubsidiary"/>
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    <link:label id="lab_ifrs-full_NoncurrentLiabilities_42c0db86-c19c-49da-a6fc-df267c3d53dc_totalLabel_en-US" xlink:label="lab_ifrs-full_NoncurrentLiabilities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total non-current liabilities</link:label>
    <link:label id="lab_ifrs-full_NoncurrentLiabilities_label_en-US" xlink:label="lab_ifrs-full_NoncurrentLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Non-current liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentLiabilities" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NoncurrentLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_NoncurrentLiabilities" xlink:to="lab_ifrs-full_NoncurrentLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_PropertyPlantAndEquipmentRecognisedAsOfAcquisitionDate_2553f0f6-7c43-4af2-bfc2-c8d760b6d6a5_terseLabel_en-US" xlink:label="lab_ifrs-full_PropertyPlantAndEquipmentRecognisedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Property and equipment</link:label>
    <link:label id="lab_ifrs-full_PropertyPlantAndEquipmentRecognisedAsOfAcquisitionDate_label_en-US" xlink:label="lab_ifrs-full_PropertyPlantAndEquipmentRecognisedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property, plant and equipment recognised as of acquisition date</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PropertyPlantAndEquipmentRecognisedAsOfAcquisitionDate" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PropertyPlantAndEquipmentRecognisedAsOfAcquisitionDate"/>
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    <link:label id="lab_ifrs-full_ClosingForeignExchangeRate_e3bd0d09-556f-4bb5-a2f8-bbb8d87c91ac_terseLabel_en-US" xlink:label="lab_ifrs-full_ClosingForeignExchangeRate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Closing rate</link:label>
    <link:label id="lab_ifrs-full_ClosingForeignExchangeRate_label_en-US" xlink:label="lab_ifrs-full_ClosingForeignExchangeRate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Closing foreign exchange rate</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClosingForeignExchangeRate" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClosingForeignExchangeRate"/>
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    <link:label id="lab_gmab_NumberOfPatentsOnWhichTheCaseFiled_082764c4-984e-4ae1-ad93-c6a55c4ad176_terseLabel_en-US" xlink:label="lab_gmab_NumberOfPatentsOnWhichTheCaseFiled" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of patents</link:label>
    <link:label id="lab_gmab_NumberOfPatentsOnWhichTheCaseFiled_label_en-US" xlink:label="lab_gmab_NumberOfPatentsOnWhichTheCaseFiled" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number of Patents On Which the Case Filed</link:label>
    <link:label id="lab_gmab_NumberOfPatentsOnWhichTheCaseFiled_documentation_en-US" xlink:label="lab_gmab_NumberOfPatentsOnWhichTheCaseFiled" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the number of patents on which the case is filed.</link:label>
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    <link:label id="lab_ifrs-full_NoncurrentAssetsRecognisedAsOfAcquisitionDate_019c08c0-10c9-7a12-adef-4714ca385de9_terseLabel_en-US" xlink:label="lab_ifrs-full_NoncurrentAssetsRecognisedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Licenses and patents</link:label>
    <link:label id="lab_ifrs-full_NoncurrentAssetsRecognisedAsOfAcquisitionDate_label_en-US" xlink:label="lab_ifrs-full_NoncurrentAssetsRecognisedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Non-current assets recognised as of acquisition date</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentAssetsRecognisedAsOfAcquisitionDate" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NoncurrentAssetsRecognisedAsOfAcquisitionDate"/>
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    <link:label id="lab_dei_DocumentRegistrationStatement_019b0cc9-0e57-7b84-8b15-c89bcb3cbcda_terseLabel_en-US" xlink:label="lab_dei_DocumentRegistrationStatement" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Document Registration Statement</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentRegistrationStatement" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentRegistrationStatement"/>
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    <link:label id="lab_ifrs-full_NumberOfSharesIssued_3ea38cf5-629a-4ca9-b934-8a8b5a43387d_periodStartLabel_en-US" xlink:label="lab_ifrs-full_NumberOfSharesIssued" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Number of shares at beginning of period</link:label>
    <link:label id="lab_ifrs-full_NumberOfSharesIssued_dadabe92-11a9-41a2-a708-9191b3872471_periodEndLabel_en-US" xlink:label="lab_ifrs-full_NumberOfSharesIssued" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Number of shares at end of period</link:label>
    <link:label id="lab_ifrs-full_NumberOfSharesIssued_label_en-US" xlink:label="lab_ifrs-full_NumberOfSharesIssued" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number of shares issued</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfSharesIssued" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfSharesIssued"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_NumberOfSharesIssued" xlink:to="lab_ifrs-full_NumberOfSharesIssued" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DepreciationRightofuseAssets_148481ed-6d7f-419a-ae61-339164b33bb9_negatedLabel_en-US" xlink:label="lab_ifrs-full_DepreciationRightofuseAssets" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Depreciation charge for the year</link:label>
    <link:label id="lab_ifrs-full_DepreciationRightofuseAssets_label_en-US" xlink:label="lab_ifrs-full_DepreciationRightofuseAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Depreciation, right-of-use assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DepreciationRightofuseAssets" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DepreciationRightofuseAssets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DepreciationRightofuseAssets" xlink:to="lab_ifrs-full_DepreciationRightofuseAssets" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsDomain_d28977a2-7698-466d-8b5e-26cba2467079_terseLabel_en-US" xlink:label="lab_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Temporary difference, unused tax losses and unused tax credits [domain]</link:label>
    <link:label id="lab_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsDomain_label_en-US" xlink:label="lab_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Temporary difference, unused tax losses and unused tax credits [domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsDomain" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsDomain"/>
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    <link:label id="lab_gmab_MarketableSecuritiesCurrent._c3a72832-2f0a-4db3-bd11-47b91f541cf5_terseLabel_en-US" xlink:label="lab_gmab_MarketableSecuritiesCurrent." xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Marketable securities</link:label>
    <link:label id="lab_gmab_MarketableSecuritiesCurrent._e8ff57ee-90bf-431a-8ffd-d84428c7d7d3_verboseLabel_en-US" xlink:label="lab_gmab_MarketableSecuritiesCurrent." xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Market value</link:label>
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    <link:label id="lab_gmab_MarketableSecuritiesCurrent._documentation_en-US" xlink:label="lab_gmab_MarketableSecuritiesCurrent." xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Amount of investments in debt and equity securities which have original maturities over to 90 days, including, but not limited to, held-to-maturity, trading and available-for-sale expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_MarketableSecuritiesCurrent." xlink:href="gmab-20251231.xsd#gmab_MarketableSecuritiesCurrent."/>
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    <link:label id="lab_ifrs-full_RetainedEarningsMember_12f82776-7471-4aeb-9775-004794af1986_terseLabel_en-US" xlink:label="lab_ifrs-full_RetainedEarningsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Retained earnings</link:label>
    <link:label id="lab_ifrs-full_RetainedEarningsMember_label_en-US" xlink:label="lab_ifrs-full_RetainedEarningsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Retained earnings [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RetainedEarningsMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RetainedEarningsMember"/>
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    <link:label id="lab_gmab_PaymentsForPostCombinationEquityAwards_55ee891d-3620-4906-bd12-e3dfdc95cc3b_terseLabel_en-US" xlink:label="lab_gmab_PaymentsForPostCombinationEquityAwards" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash payment related to the portion of awards with future vesting conditions</link:label>
    <link:label id="lab_gmab_PaymentsForPostCombinationEquityAwards_label_en-US" xlink:label="lab_gmab_PaymentsForPostCombinationEquityAwards" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments For Post Combination Equity Awards</link:label>
    <link:label id="lab_gmab_PaymentsForPostCombinationEquityAwards_documentation_en-US" xlink:label="lab_gmab_PaymentsForPostCombinationEquityAwards" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The cash outflow for payment of post combination equity awards.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_PaymentsForPostCombinationEquityAwards" xlink:href="gmab-20251231.xsd#gmab_PaymentsForPostCombinationEquityAwards"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_PaymentsForPostCombinationEquityAwards" xlink:to="lab_gmab_PaymentsForPostCombinationEquityAwards" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_ChristopherCozicMember_db61fa52-c59c-4241-8e95-c79e80c38a24_terseLabel_en-US" xlink:label="lab_gmab_ChristopherCozicMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Christopher Cozic</link:label>
    <link:label id="lab_gmab_ChristopherCozicMember_label_en-US" xlink:label="lab_gmab_ChristopherCozicMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Christopher Cozic [Member]</link:label>
    <link:label id="lab_gmab_ChristopherCozicMember_documentation_en-US" xlink:label="lab_gmab_ChristopherCozicMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents information pertaining to Christopher Cozic.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_ChristopherCozicMember" xlink:href="gmab-20251231.xsd#gmab_ChristopherCozicMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_ChristopherCozicMember" xlink:to="lab_gmab_ChristopherCozicMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_LaterThanOneYearAndNotLaterThanTwoYearsMember_d5cd73bc-35af-402e-8260-19b4e27d1341_verboseLabel_en-US" xlink:label="lab_ifrs-full_LaterThanOneYearAndNotLaterThanTwoYearsMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">2026</link:label>
    <link:label id="lab_ifrs-full_LaterThanOneYearAndNotLaterThanTwoYearsMember_label_en-US" xlink:label="lab_ifrs-full_LaterThanOneYearAndNotLaterThanTwoYearsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Later than one year and not later than two years [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LaterThanOneYearAndNotLaterThanTwoYearsMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LaterThanOneYearAndNotLaterThanTwoYearsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_LaterThanOneYearAndNotLaterThanTwoYearsMember" xlink:to="lab_ifrs-full_LaterThanOneYearAndNotLaterThanTwoYearsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfContingentLiabilitiesTable_0d8ef81b-5059-4e0f-bdb7-66710aa959cf_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfContingentLiabilitiesTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure of contingent liabilities [table]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfContingentLiabilitiesTable_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfContingentLiabilitiesTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of contingent liabilities [table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfContingentLiabilitiesTable" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfContingentLiabilitiesTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesTable" xlink:to="lab_ifrs-full_DisclosureOfContingentLiabilitiesTable" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForLeasesExplanatory_019bbc02-5869-7e84-ba9f-17f5f174b8a4_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForLeasesExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Leases</link:label>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForLeasesExplanatory_label_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForLeasesExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Description of accounting policy for leases [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForLeasesExplanatory" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DescriptionOfAccountingPolicyForLeasesExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DescriptionOfAccountingPolicyForLeasesExplanatory" xlink:to="lab_ifrs-full_DescriptionOfAccountingPolicyForLeasesExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_DisclosureOfRatingOfAgenciesForMarketableSecuritiesTableTextBlock_019bbcd9-c701-7785-887d-51768ff09900_terseLabel_en-US" xlink:label="lab_gmab_DisclosureOfRatingOfAgenciesForMarketableSecuritiesTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure of rating of agencies for marketable securities</link:label>
    <link:label id="lab_gmab_DisclosureOfRatingOfAgenciesForMarketableSecuritiesTableTextBlock_label_en-US" xlink:label="lab_gmab_DisclosureOfRatingOfAgenciesForMarketableSecuritiesTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure Of Rating Of Agencies For Marketable Securities [Table Text Block]</link:label>
    <link:label id="lab_gmab_DisclosureOfRatingOfAgenciesForMarketableSecuritiesTableTextBlock_documentation_en-US" xlink:label="lab_gmab_DisclosureOfRatingOfAgenciesForMarketableSecuritiesTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Disclosure Of Rating Of Agencies For Marketable Securities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_DisclosureOfRatingOfAgenciesForMarketableSecuritiesTableTextBlock" xlink:href="gmab-20251231.xsd#gmab_DisclosureOfRatingOfAgenciesForMarketableSecuritiesTableTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_DisclosureOfRatingOfAgenciesForMarketableSecuritiesTableTextBlock" xlink:to="lab_gmab_DisclosureOfRatingOfAgenciesForMarketableSecuritiesTableTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod_32a8a5cb-dd1d-4215-bd58-416d188ea573_terseLabel_en-US" xlink:label="lab_gmab_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Vesting period</link:label>
    <link:label id="lab_gmab_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod_label_en-US" xlink:label="lab_gmab_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period</link:label>
    <link:label id="lab_gmab_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod_documentation_en-US" xlink:label="lab_gmab_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Period which the right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod" xlink:href="gmab-20251231.xsd#gmab_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod" xlink:to="lab_gmab_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_BusinessContactMember_019b0cd3-b6e0-7075-81da-839a7634a3b7_terseLabel_en-US" xlink:label="lab_dei_BusinessContactMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Business Contact</link:label>
    <link:label id="lab_dei_BusinessContactMember_label_en-US" xlink:label="lab_dei_BusinessContactMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Business Contact [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_BusinessContactMember" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_BusinessContactMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_BusinessContactMember" xlink:to="lab_dei_BusinessContactMember" xlink:type="arc" order="1"/>
    <link:label id="lab_currency_GBP_0829109f-92d0-4c10-9afc-c2a7b0c69e72_terseLabel_en-US" xlink:label="lab_currency_GBP" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">GBP</link:label>
    <link:label id="lab_currency_GBP_label_en-US" xlink:label="lab_currency_GBP" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">United Kingdom, Pounds</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_currency_GBP" xlink:href="https://xbrl.sec.gov/currency/2025/currency-2025.xsd#currency_GBP"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_currency_GBP" xlink:to="lab_currency_GBP" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_IncreaseDecreaseInInterestIncome_be118d0b-5896-434f-8300-01ba68e24d9b_terseLabel_en-US" xlink:label="lab_gmab_IncreaseDecreaseInInterestIncome" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Increase (decrease) in interest income</link:label>
    <link:label id="lab_gmab_IncreaseDecreaseInInterestIncome_label_en-US" xlink:label="lab_gmab_IncreaseDecreaseInInterestIncome" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) In Interest Income</link:label>
    <link:label id="lab_gmab_IncreaseDecreaseInInterestIncome_documentation_en-US" xlink:label="lab_gmab_IncreaseDecreaseInInterestIncome" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The amount of increase in interest income driven by higher effective interest rates in the U.S., Europe and Denmark for the respective periods.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_IncreaseDecreaseInInterestIncome" xlink:href="gmab-20251231.xsd#gmab_IncreaseDecreaseInInterestIncome"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_IncreaseDecreaseInInterestIncome" xlink:to="lab_gmab_IncreaseDecreaseInInterestIncome" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_CorporateBondsMember_351d2d0b-701f-4e06-8ca6-96ff87e9373e_terseLabel_en-US" xlink:label="lab_gmab_CorporateBondsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Corporate bonds</link:label>
    <link:label id="lab_gmab_CorporateBondsMember_label_en-US" xlink:label="lab_gmab_CorporateBondsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Corporate Bonds [Member]</link:label>
    <link:label id="lab_gmab_CorporateBondsMember_documentation_en-US" xlink:label="lab_gmab_CorporateBondsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This member stands for corporate bonds.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_CorporateBondsMember" xlink:href="gmab-20251231.xsd#gmab_CorporateBondsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_CorporateBondsMember" xlink:to="lab_gmab_CorporateBondsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_NumberOfApprovedProductsJointlyCommercializedWithCollaboration_b28da8f8-385b-49a8-b65f-0eba39de2d20_terseLabel_en-US" xlink:label="lab_gmab_NumberOfApprovedProductsJointlyCommercializedWithCollaboration" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of approved products jointly commercialized by collaboration partner</link:label>
    <link:label id="lab_gmab_NumberOfApprovedProductsJointlyCommercializedWithCollaboration_label_en-US" xlink:label="lab_gmab_NumberOfApprovedProductsJointlyCommercializedWithCollaboration" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number Of Approved Products Jointly Commercialized With Collaboration</link:label>
    <link:label id="lab_gmab_NumberOfApprovedProductsJointlyCommercializedWithCollaboration_documentation_en-US" xlink:label="lab_gmab_NumberOfApprovedProductsJointlyCommercializedWithCollaboration" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Number of approved products jointly commercialized by collaboration partner.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_NumberOfApprovedProductsJointlyCommercializedWithCollaboration" xlink:href="gmab-20251231.xsd#gmab_NumberOfApprovedProductsJointlyCommercializedWithCollaboration"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_NumberOfApprovedProductsJointlyCommercializedWithCollaboration" xlink:to="lab_gmab_NumberOfApprovedProductsJointlyCommercializedWithCollaboration" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ExternalCreditGradesDomain_b86191fe-84fb-43ec-9240-b6dece670d24_terseLabel_en-US" xlink:label="lab_ifrs-full_ExternalCreditGradesDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">External credit grades [domain]</link:label>
    <link:label id="lab_ifrs-full_ExternalCreditGradesDomain_label_en-US" xlink:label="lab_ifrs-full_ExternalCreditGradesDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">External credit grades [domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ExternalCreditGradesDomain" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ExternalCreditGradesDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ExternalCreditGradesDomain" xlink:to="lab_ifrs-full_ExternalCreditGradesDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CategoriesOfFinancialAssetsDomain_07cac303-7b23-4bf0-8166-2b39da12d1f1_terseLabel_en-US" xlink:label="lab_ifrs-full_CategoriesOfFinancialAssetsDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Categories of financial assets [domain]</link:label>
    <link:label id="lab_ifrs-full_CategoriesOfFinancialAssetsDomain_label_en-US" xlink:label="lab_ifrs-full_CategoriesOfFinancialAssetsDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Categories of financial assets [domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialAssetsDomain" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialAssetsDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CategoriesOfFinancialAssetsDomain" xlink:to="lab_ifrs-full_CategoriesOfFinancialAssetsDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CarryingAmountMember_e68e5743-3ebb-40f6-aa64-4332b3c4c5a5_terseLabel_en-US" xlink:label="lab_ifrs-full_CarryingAmountMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Carrying amount [member]</link:label>
    <link:label id="lab_ifrs-full_CarryingAmountMember_label_en-US" xlink:label="lab_ifrs-full_CarryingAmountMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Carrying amount [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CarryingAmountMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CarryingAmountMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CarryingAmountMember" xlink:to="lab_ifrs-full_CarryingAmountMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ComprehensiveIncomeAbstract_019b9f7b-d821-7418-ba50-c437fb7917d9_terseLabel_en-US" xlink:label="lab_ifrs-full_ComprehensiveIncomeAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Comprehensive income [abstract]</link:label>
    <link:label id="lab_ifrs-full_ComprehensiveIncomeAbstract_label_en-US" xlink:label="lab_ifrs-full_ComprehensiveIncomeAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Comprehensive income [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComprehensiveIncomeAbstract" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComprehensiveIncomeAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ComprehensiveIncomeAbstract" xlink:to="lab_ifrs-full_ComprehensiveIncomeAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_DisclosureOfReceivablesTable_c8d633bb-8928-4a0a-9c88-e498898dbdf6_terseLabel_en-US" xlink:label="lab_gmab_DisclosureOfReceivablesTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure Of Receivables [Table]</link:label>
    <link:label id="lab_gmab_DisclosureOfReceivablesTable_label_en-US" xlink:label="lab_gmab_DisclosureOfReceivablesTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure Of Receivables [Table]</link:label>
    <link:label id="lab_gmab_DisclosureOfReceivablesTable_documentation_en-US" xlink:label="lab_gmab_DisclosureOfReceivablesTable" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Schedule of information related to receivables.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_DisclosureOfReceivablesTable" xlink:href="gmab-20251231.xsd#gmab_DisclosureOfReceivablesTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_DisclosureOfReceivablesTable" xlink:to="lab_gmab_DisclosureOfReceivablesTable" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ChangesInEquityAbstract_45c9ee53-f955-4278-a12a-9da2071e90eb_verboseLabel_en-US" xlink:label="lab_ifrs-full_ChangesInEquityAbstract" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Changes in equity [abstract]</link:label>
    <link:label id="lab_ifrs-full_ChangesInEquityAbstract_d448b5bb-98b2-4573-b8ec-78728a24b69f_terseLabel_en-US" xlink:label="lab_ifrs-full_ChangesInEquityAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share capital</link:label>
    <link:label id="lab_ifrs-full_ChangesInEquityAbstract_label_en-US" xlink:label="lab_ifrs-full_ChangesInEquityAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Changes in equity [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ChangesInEquityAbstract" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ChangesInEquityAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ChangesInEquityAbstract" xlink:to="lab_ifrs-full_ChangesInEquityAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_KeyManagementPersonnelCompensationShorttermEmployeeBenefits_351268a9-3244-4fde-9f24-c4a528bbf6b6_terseLabel_en-US" xlink:label="lab_ifrs-full_KeyManagementPersonnelCompensationShorttermEmployeeBenefits" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Wages and salaries</link:label>
    <link:label id="lab_ifrs-full_KeyManagementPersonnelCompensationShorttermEmployeeBenefits_label_en-US" xlink:label="lab_ifrs-full_KeyManagementPersonnelCompensationShorttermEmployeeBenefits" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Key management personnel compensation, short-term employee benefits</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_KeyManagementPersonnelCompensationShorttermEmployeeBenefits" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_KeyManagementPersonnelCompensationShorttermEmployeeBenefits"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_KeyManagementPersonnelCompensationShorttermEmployeeBenefits" xlink:to="lab_ifrs-full_KeyManagementPersonnelCompensationShorttermEmployeeBenefits" xlink:type="arc" order="1"/>
    <link:label id="lab_country_NL_5f8d2f33-f41c-43ba-827c-d01d9e0d4682_terseLabel_en-US" xlink:label="lab_country_NL" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Netherlands</link:label>
    <link:label id="lab_country_NL_label_en-US" xlink:label="lab_country_NL" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">NETHERLANDS</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_country_NL" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_NL"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_country_NL" xlink:to="lab_country_NL" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_SecurityExchangeName_019b0cef-a6ad-765f-9dc6-f6f754c0214b_terseLabel_en-US" xlink:label="lab_dei_SecurityExchangeName" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Security Exchange Name</link:label>
    <link:label id="lab_dei_SecurityExchangeName_label_en-US" xlink:label="lab_dei_SecurityExchangeName" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Security Exchange Name</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_SecurityExchangeName"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_SecurityExchangeName" xlink:to="lab_dei_SecurityExchangeName" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_NumberOfInstrumentsOtherEquityInstrumentsWarrantsTransferred_019bbcfc-b0bd-7707-923e-962afcb23afc_negatedTerseLabel_en-US" xlink:label="lab_gmab_NumberOfInstrumentsOtherEquityInstrumentsWarrantsTransferred" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Transferred (in shares)</link:label>
    <link:label id="lab_gmab_NumberOfInstrumentsOtherEquityInstrumentsWarrantsTransferred_label_en-US" xlink:label="lab_gmab_NumberOfInstrumentsOtherEquityInstrumentsWarrantsTransferred" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number Of Instruments Other Equity Instruments, Warrants, Transferred</link:label>
    <link:label id="lab_gmab_NumberOfInstrumentsOtherEquityInstrumentsWarrantsTransferred_documentation_en-US" xlink:label="lab_gmab_NumberOfInstrumentsOtherEquityInstrumentsWarrantsTransferred" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Number of warrants Transferred.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_NumberOfInstrumentsOtherEquityInstrumentsWarrantsTransferred" xlink:href="gmab-20251231.xsd#gmab_NumberOfInstrumentsOtherEquityInstrumentsWarrantsTransferred"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_NumberOfInstrumentsOtherEquityInstrumentsWarrantsTransferred" xlink:to="lab_gmab_NumberOfInstrumentsOtherEquityInstrumentsWarrantsTransferred" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_OtherDisclosuresAbstract_019b26a8-6a9d-731d-ae41-7224f158140d_terseLabel_en-US" xlink:label="lab_gmab_OtherDisclosuresAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other Disclosures [Abstract]</link:label>
    <link:label id="lab_gmab_OtherDisclosuresAbstract_label_en-US" xlink:label="lab_gmab_OtherDisclosuresAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Disclosures [Abstract]</link:label>
    <link:label id="lab_gmab_OtherDisclosuresAbstract_documentation_en-US" xlink:label="lab_gmab_OtherDisclosuresAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">No definition.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_OtherDisclosuresAbstract" xlink:href="gmab-20251231.xsd#gmab_OtherDisclosuresAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_OtherDisclosuresAbstract" xlink:to="lab_gmab_OtherDisclosuresAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_FormerMemberOfBoardOfDirectorsExecutiveManagementAndEmployeesMember_5496cbf2-5c45-4d6a-85bd-9218545a2fae_terseLabel_en-US" xlink:label="lab_gmab_FormerMemberOfBoardOfDirectorsExecutiveManagementAndEmployeesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Former member of Board of Directors, Executive Management and Employees</link:label>
    <link:label id="lab_gmab_FormerMemberOfBoardOfDirectorsExecutiveManagementAndEmployeesMember_label_en-US" xlink:label="lab_gmab_FormerMemberOfBoardOfDirectorsExecutiveManagementAndEmployeesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Former Member of Board of Directors, Executive Management and Employees [Member]</link:label>
    <link:label id="lab_gmab_FormerMemberOfBoardOfDirectorsExecutiveManagementAndEmployeesMember_documentation_en-US" xlink:label="lab_gmab_FormerMemberOfBoardOfDirectorsExecutiveManagementAndEmployeesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents information pertaining to former member of board of directors and employees .</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_FormerMemberOfBoardOfDirectorsExecutiveManagementAndEmployeesMember" xlink:href="gmab-20251231.xsd#gmab_FormerMemberOfBoardOfDirectorsExecutiveManagementAndEmployeesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_FormerMemberOfBoardOfDirectorsExecutiveManagementAndEmployeesMember" xlink:to="lab_gmab_FormerMemberOfBoardOfDirectorsExecutiveManagementAndEmployeesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_TermLoanASecuredMember_019b27cb-98f0-754d-997d-dc599ae24faa_terseLabel_en-US" xlink:label="lab_gmab_TermLoanASecuredMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Term Loan A (Secured)</link:label>
    <link:label id="lab_gmab_TermLoanASecuredMember_label_en-US" xlink:label="lab_gmab_TermLoanASecuredMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Term Loan A (Secured) [Member]</link:label>
    <link:label id="lab_gmab_TermLoanASecuredMember_documentation_en-US" xlink:label="lab_gmab_TermLoanASecuredMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Term Loan A (Secured)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_TermLoanASecuredMember" xlink:href="gmab-20251231.xsd#gmab_TermLoanASecuredMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_TermLoanASecuredMember" xlink:to="lab_gmab_TermLoanASecuredMember" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_OperatingAssetsAndLiabilitiesTextBlock_fc6778be-c7db-4f0c-8646-28564345894b_verboseLabel_en-US" xlink:label="lab_gmab_OperatingAssetsAndLiabilitiesTextBlock" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Operating Assets and Liabilities</link:label>
    <link:label id="lab_gmab_OperatingAssetsAndLiabilitiesTextBlock_label_en-US" xlink:label="lab_gmab_OperatingAssetsAndLiabilitiesTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Assets And Liabilities [Text Block]</link:label>
    <link:label id="lab_gmab_OperatingAssetsAndLiabilitiesTextBlock_documentation_en-US" xlink:label="lab_gmab_OperatingAssetsAndLiabilitiesTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The entire disclosure for operating assets and liabilities.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_OperatingAssetsAndLiabilitiesTextBlock" xlink:href="gmab-20251231.xsd#gmab_OperatingAssetsAndLiabilitiesTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_OperatingAssetsAndLiabilitiesTextBlock" xlink:to="lab_gmab_OperatingAssetsAndLiabilitiesTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CancellationOfTreasuryShares_019c5105-a660-7d45-a586-18b5a841c45a_negatedLabel_en-US" xlink:label="lab_ifrs-full_CancellationOfTreasuryShares" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Reduction in share capital</link:label>
    <link:label id="lab_ifrs-full_CancellationOfTreasuryShares_label_en-US" xlink:label="lab_ifrs-full_CancellationOfTreasuryShares" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cancellation of treasury shares</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CancellationOfTreasuryShares" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CancellationOfTreasuryShares"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CancellationOfTreasuryShares" xlink:to="lab_ifrs-full_CancellationOfTreasuryShares" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_RolfHoffmannMember_a06a8932-9997-4be9-badc-275f28f67213_terseLabel_en-US" xlink:label="lab_gmab_RolfHoffmannMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Rolf Hoffmann</link:label>
    <link:label id="lab_gmab_RolfHoffmannMember_label_en-US" xlink:label="lab_gmab_RolfHoffmannMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Rolf Hoffmann [Member]</link:label>
    <link:label id="lab_gmab_RolfHoffmannMember_documentation_en-US" xlink:label="lab_gmab_RolfHoffmannMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents information pertaining to Rolf Hoffmann.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_RolfHoffmannMember" xlink:href="gmab-20251231.xsd#gmab_RolfHoffmannMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_RolfHoffmannMember" xlink:to="lab_gmab_RolfHoffmannMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_RightofuseAssets_cd7b1743-263c-4994-99a2-6c49fee5cfe6_verboseLabel_en-US" xlink:label="lab_ifrs-full_RightofuseAssets" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Right-of-use assets</link:label>
    <link:label id="lab_ifrs-full_RightofuseAssets_017515cf-16ed-4323-8b9b-d046bd240348_periodStartLabel_en-US" xlink:label="lab_ifrs-full_RightofuseAssets" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Balance at January 1</link:label>
    <link:label id="lab_ifrs-full_RightofuseAssets_3c819d35-6595-4dd2-8a8c-34958916617e_periodEndLabel_en-US" xlink:label="lab_ifrs-full_RightofuseAssets" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Balance at December 31</link:label>
    <link:label id="lab_ifrs-full_RightofuseAssets_label_en-US" xlink:label="lab_ifrs-full_RightofuseAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Right-of-use assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RightofuseAssets" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RightofuseAssets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_RightofuseAssets" xlink:to="lab_ifrs-full_RightofuseAssets" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_ShareholdingsByBoardOfDirectorsAndExecutiveManagementLineItems_cb6ed795-1fc5-4649-af2b-e1da17902f30_terseLabel_en-US" xlink:label="lab_gmab_ShareholdingsByBoardOfDirectorsAndExecutiveManagementLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Shareholdings By Board Of Directors And Executive Management [Line items]</link:label>
    <link:label id="lab_gmab_ShareholdingsByBoardOfDirectorsAndExecutiveManagementLineItems_bc187fff-afe1-4248-b8ec-25f1c15aaf83_verboseLabel_en-US" xlink:label="lab_gmab_ShareholdingsByBoardOfDirectorsAndExecutiveManagementLineItems" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Collaborations and Licenses</link:label>
    <link:label id="lab_gmab_ShareholdingsByBoardOfDirectorsAndExecutiveManagementLineItems_label_en-US" xlink:label="lab_gmab_ShareholdingsByBoardOfDirectorsAndExecutiveManagementLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Shareholdings By Board Of Directors And Executive Management [Line items]</link:label>
    <link:label id="lab_gmab_ShareholdingsByBoardOfDirectorsAndExecutiveManagementLineItems_documentation_en-US" xlink:label="lab_gmab_ShareholdingsByBoardOfDirectorsAndExecutiveManagementLineItems" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Na</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_ShareholdingsByBoardOfDirectorsAndExecutiveManagementLineItems" xlink:href="gmab-20251231.xsd#gmab_ShareholdingsByBoardOfDirectorsAndExecutiveManagementLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_ShareholdingsByBoardOfDirectorsAndExecutiveManagementLineItems" xlink:to="lab_gmab_ShareholdingsByBoardOfDirectorsAndExecutiveManagementLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_ContactPersonnelName_019b0cd1-1a61-7fbc-b10a-fccdeabd7ee2_terseLabel_en-US" xlink:label="lab_dei_ContactPersonnelName" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Contact Personnel Name</link:label>
    <link:label id="lab_dei_ContactPersonnelName_label_en-US" xlink:label="lab_dei_ContactPersonnelName" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Contact Personnel Name</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_ContactPersonnelName" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_ContactPersonnelName"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_ContactPersonnelName" xlink:to="lab_dei_ContactPersonnelName" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_PurchaseOfTreasuryShares_d8e725e6-ceac-4615-afb2-937aebba9ae5_negatedLabel_en-US" xlink:label="lab_ifrs-full_PurchaseOfTreasuryShares" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Purchase of treasury shares</link:label>
    <link:label id="lab_ifrs-full_PurchaseOfTreasuryShares_53f49a72-678e-42d0-baf1-b82c0f708c48_verboseLabel_en-US" xlink:label="lab_ifrs-full_PurchaseOfTreasuryShares" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Purchase of treasury shares</link:label>
    <link:label id="lab_ifrs-full_PurchaseOfTreasuryShares_f2392b84-a862-4bdf-b5a1-a3e433bc5aad_terseLabel_en-US" xlink:label="lab_ifrs-full_PurchaseOfTreasuryShares" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Purchase of treasury shares</link:label>
    <link:label id="lab_ifrs-full_PurchaseOfTreasuryShares_label_en-US" xlink:label="lab_ifrs-full_PurchaseOfTreasuryShares" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Purchase of treasury shares</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PurchaseOfTreasuryShares" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PurchaseOfTreasuryShares"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_PurchaseOfTreasuryShares" xlink:to="lab_ifrs-full_PurchaseOfTreasuryShares" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_DescriptionOfAccountingPolicyForCostOfProductSalesPolicyTextBlock_019c5160-7759-77f4-b4ed-d5924e088964_terseLabel_en-US" xlink:label="lab_gmab_DescriptionOfAccountingPolicyForCostOfProductSalesPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cost of Product Sales</link:label>
    <link:label id="lab_gmab_DescriptionOfAccountingPolicyForCostOfProductSalesPolicyTextBlock_label_en-US" xlink:label="lab_gmab_DescriptionOfAccountingPolicyForCostOfProductSalesPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Description Of Accounting Policy For Cost Of Product Sales [Policy Text Block]</link:label>
    <link:label id="lab_gmab_DescriptionOfAccountingPolicyForCostOfProductSalesPolicyTextBlock_documentation_en-US" xlink:label="lab_gmab_DescriptionOfAccountingPolicyForCostOfProductSalesPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Description Of Accounting Policy For Cost Of Product Sales</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_DescriptionOfAccountingPolicyForCostOfProductSalesPolicyTextBlock" xlink:href="gmab-20251231.xsd#gmab_DescriptionOfAccountingPolicyForCostOfProductSalesPolicyTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_DescriptionOfAccountingPolicyForCostOfProductSalesPolicyTextBlock" xlink:to="lab_gmab_DescriptionOfAccountingPolicyForCostOfProductSalesPolicyTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_SeniorUnsecuredNotesMember_019b27cc-8b0d-73ee-bda6-56841e29e5d4_terseLabel_en-US" xlink:label="lab_gmab_SeniorUnsecuredNotesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unsecured Notes</link:label>
    <link:label id="lab_gmab_SeniorUnsecuredNotesMember_label_en-US" xlink:label="lab_gmab_SeniorUnsecuredNotesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Senior Unsecured Notes [Member]</link:label>
    <link:label id="lab_gmab_SeniorUnsecuredNotesMember_documentation_en-US" xlink:label="lab_gmab_SeniorUnsecuredNotesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Senior Unsecured Notes</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_SeniorUnsecuredNotesMember" xlink:href="gmab-20251231.xsd#gmab_SeniorUnsecuredNotesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_SeniorUnsecuredNotesMember" xlink:to="lab_gmab_SeniorUnsecuredNotesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_USGovernmentBondsAndTreasuryBillsMember_02eb1493-7c71-4a72-8651-bdf2f40548bb_terseLabel_en-US" xlink:label="lab_gmab_USGovernmentBondsAndTreasuryBillsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">US government bonds and treasury bills</link:label>
    <link:label id="lab_gmab_USGovernmentBondsAndTreasuryBillsMember_label_en-US" xlink:label="lab_gmab_USGovernmentBondsAndTreasuryBillsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">US Government Bonds And Treasury Bills [Member]</link:label>
    <link:label id="lab_gmab_USGovernmentBondsAndTreasuryBillsMember_documentation_en-US" xlink:label="lab_gmab_USGovernmentBondsAndTreasuryBillsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This member stands for US government bonds and treasury bills.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_USGovernmentBondsAndTreasuryBillsMember" xlink:href="gmab-20251231.xsd#gmab_USGovernmentBondsAndTreasuryBillsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_USGovernmentBondsAndTreasuryBillsMember" xlink:to="lab_gmab_USGovernmentBondsAndTreasuryBillsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_NumberOfAdditionalLawsuits_019bc6eb-0862-7b1e-8f65-b4f0158fb4e2_terseLabel_en-US" xlink:label="lab_gmab_NumberOfAdditionalLawsuits" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of additional lawsuits</link:label>
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    <link:label id="lab_gmab_NumberOfAdditionalLawsuits_documentation_en-US" xlink:label="lab_gmab_NumberOfAdditionalLawsuits" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Number Of Additional Lawsuits</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_NumberOfAdditionalLawsuits" xlink:href="gmab-20251231.xsd#gmab_NumberOfAdditionalLawsuits"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_NumberOfAdditionalLawsuits" xlink:to="lab_gmab_NumberOfAdditionalLawsuits" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_CashTransferredForOutstandingEquityAwardsForSettlementOfVestedAndNonVestedAwards_b3204d73-4470-4662-8015-27f45259bf3a_terseLabel_en-US" xlink:label="lab_gmab_CashTransferredForOutstandingEquityAwardsForSettlementOfVestedAndNonVestedAwards" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash payment to holders of outstanding equity awards for settlement of such vested and non-vested awards</link:label>
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    <link:label id="lab_gmab_CashTransferredForOutstandingEquityAwardsForSettlementOfVestedAndNonVestedAwards_documentation_en-US" xlink:label="lab_gmab_CashTransferredForOutstandingEquityAwardsForSettlementOfVestedAndNonVestedAwards" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The fair value, at acquisition date, of cash transferred for outstanding equity awards for settlement of vested and non-vested awards as consideration in a business combination.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_CashTransferredForOutstandingEquityAwardsForSettlementOfVestedAndNonVestedAwards" xlink:href="gmab-20251231.xsd#gmab_CashTransferredForOutstandingEquityAwardsForSettlementOfVestedAndNonVestedAwards"/>
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    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ContractLiabilities" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ContractLiabilities"/>
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    <link:label id="lab_ifrs-full_DisclosureOfReclassificationsOrChangesInPresentationLineItems_019b07d0-9688-757e-b7df-5067fa8995cc_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfReclassificationsOrChangesInPresentationLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure of reclassifications or changes in presentation [line items]</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfReclassificationsOrChangesInPresentationLineItems" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfReclassificationsOrChangesInPresentationLineItems"/>
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    <link:label id="lab_ifrs-full_CurrentRestrictedCashAndCashEquivalents_ac37a95b-7f81-4ed7-a04e-dc4c15dce0cb_terseLabel_en-US" xlink:label="lab_ifrs-full_CurrentRestrictedCashAndCashEquivalents" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Restricted cash balances for funds held in escrow</link:label>
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    <link:label id="lab_gmab_ProfoundLimitedMember_1337bec6-915f-4db8-b8d0-95a85518d2db_terseLabel_en-US" xlink:label="lab_gmab_ProfoundLimitedMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">ProfoundBio Limited</link:label>
    <link:label id="lab_gmab_ProfoundLimitedMember_label_en-US" xlink:label="lab_gmab_ProfoundLimitedMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Profound Limited [Member]</link:label>
    <link:label id="lab_gmab_ProfoundLimitedMember_documentation_en-US" xlink:label="lab_gmab_ProfoundLimitedMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This member stands for Profound Limited.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_ProfoundLimitedMember" xlink:href="gmab-20251231.xsd#gmab_ProfoundLimitedMember"/>
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    <link:label id="lab_srt_RangeMember_019c51fd-fcb4-7cab-a791-c32f92d08ea0_terseLabel_en-US" xlink:label="lab_srt_RangeMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Statistical Measurement [Domain]</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
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    <link:label id="lab_ifrs-full_NumberOfPotentialOrdinarySharesThatAreAntidilutiveInPeriodPresented_89906cc9-e8c2-4368-9c36-f7b9415ecb4a_terseLabel_en-US" xlink:label="lab_ifrs-full_NumberOfPotentialOrdinarySharesThatAreAntidilutiveInPeriodPresented" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Antidilutive shares (in shares)</link:label>
    <link:label id="lab_ifrs-full_NumberOfPotentialOrdinarySharesThatAreAntidilutiveInPeriodPresented_label_en-US" xlink:label="lab_ifrs-full_NumberOfPotentialOrdinarySharesThatAreAntidilutiveInPeriodPresented" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number of potential ordinary shares that are antidilutive in period presented</link:label>
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    <link:label id="lab_gmab_DisclosureOfFinanceIncomeExpensesTableTextBlock_c605a809-db83-4e06-a7a3-21082cc48df5_terseLabel_en-US" xlink:label="lab_gmab_DisclosureOfFinanceIncomeExpensesTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of finance income and expenses</link:label>
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    <link:label id="lab_gmab_CashAndCashEquivalents.Member_923511a1-0cca-4720-a41e-5dd683e47222_terseLabel_en-US" xlink:label="lab_gmab_CashAndCashEquivalents.Member" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash and cash equivalents</link:label>
    <link:label id="lab_gmab_CashAndCashEquivalents.Member_label_en-US" xlink:label="lab_gmab_CashAndCashEquivalents.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash And Cash Equivalents. [Member]</link:label>
    <link:label id="lab_gmab_CashAndCashEquivalents.Member_documentation_en-US" xlink:label="lab_gmab_CashAndCashEquivalents.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_CashAndCashEquivalents.Member" xlink:href="gmab-20251231.xsd#gmab_CashAndCashEquivalents.Member"/>
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    <link:label id="lab_ifrs-full_ReserveOfExchangeDifferencesOnTranslationMember_2807d02d-bbef-47b2-9fca-aa2a1cdc65fa_terseLabel_en-US" xlink:label="lab_ifrs-full_ReserveOfExchangeDifferencesOnTranslationMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Translation reserves</link:label>
    <link:label id="lab_ifrs-full_ReserveOfExchangeDifferencesOnTranslationMember_label_en-US" xlink:label="lab_ifrs-full_ReserveOfExchangeDifferencesOnTranslationMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Reserve of exchange differences on translation [member]</link:label>
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    <link:label id="lab_gmab_ShareBasedInstrumentsTemporaryDifferencesMember_359e3ba7-ce91-4691-9074-2ec0d3d0fd4d_terseLabel_en-US" xlink:label="lab_gmab_ShareBasedInstrumentsTemporaryDifferencesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share-based instruments</link:label>
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    <link:label id="lab_gmab_ShareBasedInstrumentsTemporaryDifferencesMember_documentation_en-US" xlink:label="lab_gmab_ShareBasedInstrumentsTemporaryDifferencesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This member stands for Share-Based Instruments.</link:label>
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    <link:label id="lab_ifrs-full_OperatingExpense_8f4313a2-757b-4b47-b68b-c53041e25ee5_negatedTotalLabel_en-US" xlink:label="lab_ifrs-full_OperatingExpense" xlink:role="http://www.xbrl.org/2009/role/negatedTotalLabel" xlink:type="resource" xml:lang="en-US">Total costs and operating expenses</link:label>
    <link:label id="lab_ifrs-full_OperatingExpense_label_en-US" xlink:label="lab_ifrs-full_OperatingExpense" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating expense</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OperatingExpense" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OperatingExpense"/>
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    <link:label id="lab_ifrs-full_UsefulLifeMeasuredAsPeriodOfTimeIntangibleAssetsOtherThanGoodwill_a392cbb2-1227-47c5-81dd-84f70346fb76_terseLabel_en-US" xlink:label="lab_ifrs-full_UsefulLifeMeasuredAsPeriodOfTimeIntangibleAssetsOtherThanGoodwill" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Estimated useful life of intangibles (in years)</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_UsefulLifeMeasuredAsPeriodOfTimeIntangibleAssetsOtherThanGoodwill" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_UsefulLifeMeasuredAsPeriodOfTimeIntangibleAssetsOtherThanGoodwill"/>
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    <link:label id="lab_ifrs-full_DecreaseIncreaseThroughTaxOnSharebasedPaymentTransactions_8a80daf1-f21c-432d-8f36-1f02920be8d4_negatedTerseLabel_en-US" xlink:label="lab_ifrs-full_DecreaseIncreaseThroughTaxOnSharebasedPaymentTransactions" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Withholding taxes on behalf of employees on net settled RSUs</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DecreaseIncreaseThroughTaxOnSharebasedPaymentTransactions" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DecreaseIncreaseThroughTaxOnSharebasedPaymentTransactions"/>
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    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfShareCapitalAxis" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfShareCapitalAxis"/>
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    <link:label id="lab_gmab_NumberOfNewPatentsOnWhichTheCaseFiled_019c4c39-4deb-7bef-bbbd-8757f522c609_terseLabel_en-US" xlink:label="lab_gmab_NumberOfNewPatentsOnWhichTheCaseFiled" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of new patents</link:label>
    <link:label id="lab_gmab_NumberOfNewPatentsOnWhichTheCaseFiled_label_en-US" xlink:label="lab_gmab_NumberOfNewPatentsOnWhichTheCaseFiled" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number of New Patents On Which the Case Filed</link:label>
    <link:label id="lab_gmab_NumberOfNewPatentsOnWhichTheCaseFiled_documentation_en-US" xlink:label="lab_gmab_NumberOfNewPatentsOnWhichTheCaseFiled" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Number Of Granted Patents</link:label>
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    <link:label id="lab_ifrs-full_NumberOfSharesAuthorised_4164de40-23bd-4e1e-8e5e-c4c0676f7622_terseLabel_en-US" xlink:label="lab_ifrs-full_NumberOfSharesAuthorised" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of shares authorized (in shares)</link:label>
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    <link:label id="lab_ifrs-full_Equity_ae7c92c5-d7e3-4f80-9bd7-1718d1e13f2f_totalLabel_en-US" xlink:label="lab_ifrs-full_Equity" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total shareholders' equity</link:label>
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    <link:label id="lab_ifrs-full_Equity_3cbd5ded-4f07-489c-86b7-5b3b97428ddb_periodEndLabel_en-US" xlink:label="lab_ifrs-full_Equity" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Balance at end of period</link:label>
    <link:label id="lab_ifrs-full_Equity_8dd1c3d8-b4bb-4d8e-ba11-f13b74e4803c_terseLabel_en-US" xlink:label="lab_ifrs-full_Equity" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total shareholders' equity</link:label>
    <link:label id="lab_ifrs-full_Equity_label_en-US" xlink:label="lab_ifrs-full_Equity" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Equity</link:label>
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    <link:label id="lab_dei_EntityAddressesAddressTypeAxis_019b0cd2-f820-7548-be24-64d7fa09802a_terseLabel_en-US" xlink:label="lab_dei_EntityAddressesAddressTypeAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Addresses, Address Type [Axis]</link:label>
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    <link:label id="lab_ifrs-full_PropertyPlantAndEquipment_21b930bc-fbfe-4b81-95e9-ba1ef55d69d7_terseLabel_en-US" xlink:label="lab_ifrs-full_PropertyPlantAndEquipment" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Property and equipment</link:label>
    <link:label id="lab_ifrs-full_PropertyPlantAndEquipment_fa4e92b3-b06b-4e18-b24d-d5f423cac4ea_periodStartLabel_en-US" xlink:label="lab_ifrs-full_PropertyPlantAndEquipment" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Cost at beginning of period</link:label>
    <link:label id="lab_ifrs-full_PropertyPlantAndEquipment_9fbfa3a9-60f1-4754-af3d-13e8a178fd82_periodEndLabel_en-US" xlink:label="lab_ifrs-full_PropertyPlantAndEquipment" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Cost at end of period</link:label>
    <link:label id="lab_ifrs-full_PropertyPlantAndEquipment_label_en-US" xlink:label="lab_ifrs-full_PropertyPlantAndEquipment" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property, plant and equipment</link:label>
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    <link:label id="lab_ifrs-full_OtherReceivables_9a9ae110-a348-48b8-99bd-577aac664e43_terseLabel_en-US" xlink:label="lab_ifrs-full_OtherReceivables" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other receivables</link:label>
    <link:label id="lab_ifrs-full_OtherReceivables_label_en-US" xlink:label="lab_ifrs-full_OtherReceivables" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other receivables</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherReceivables" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherReceivables"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OtherReceivables" xlink:to="lab_ifrs-full_OtherReceivables" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_NumberOfApprovedProductsCommercializedByThirdParties_548b54be-7d56-4dbf-a4ba-aa06bcadd8b8_terseLabel_en-US" xlink:label="lab_gmab_NumberOfApprovedProductsCommercializedByThirdParties" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of approved products commercialized by third parties</link:label>
    <link:label id="lab_gmab_NumberOfApprovedProductsCommercializedByThirdParties_label_en-US" xlink:label="lab_gmab_NumberOfApprovedProductsCommercializedByThirdParties" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number Of Approved Products Commercialized By Third Parties</link:label>
    <link:label id="lab_gmab_NumberOfApprovedProductsCommercializedByThirdParties_documentation_en-US" xlink:label="lab_gmab_NumberOfApprovedProductsCommercializedByThirdParties" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Number of approved products commercialized by third parties.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_NumberOfApprovedProductsCommercializedByThirdParties" xlink:href="gmab-20251231.xsd#gmab_NumberOfApprovedProductsCommercializedByThirdParties"/>
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    <link:label id="lab_gmab_GenmabGermanyGmbHMember_019b07a4-10d4-7748-974a-eda964e3846b_terseLabel_en-US" xlink:label="lab_gmab_GenmabGermanyGmbHMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Genmab Germany GmbH</link:label>
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    <link:label id="lab_gmab_GenmabGermanyGmbHMember_documentation_en-US" xlink:label="lab_gmab_GenmabGermanyGmbHMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Genmab Germany GmbH</link:label>
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    <link:label id="lab_gmab_AverageNumberOfOrdinarySharesExcludingTreasurySharesOutstanding_88bf520a-5a08-4dd0-aaf4-69aea6a6b182_totalLabel_en-US" xlink:label="lab_gmab_AverageNumberOfOrdinarySharesExcludingTreasurySharesOutstanding" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Weighted average number of shares excl. treasury shares (in shares)</link:label>
    <link:label id="lab_gmab_AverageNumberOfOrdinarySharesExcludingTreasurySharesOutstanding_label_en-US" xlink:label="lab_gmab_AverageNumberOfOrdinarySharesExcludingTreasurySharesOutstanding" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Average Number Of Ordinary Shares Excluding Treasury Shares Outstanding</link:label>
    <link:label id="lab_gmab_AverageNumberOfOrdinarySharesExcludingTreasurySharesOutstanding_documentation_en-US" xlink:label="lab_gmab_AverageNumberOfOrdinarySharesExcludingTreasurySharesOutstanding" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The number of ordinary shares excluding shares outstanding.</link:label>
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    <link:label id="lab_gmab_ImpactOnFinancialPositionTerminationOfServices_51924895-029c-47a2-a2d1-ec108f8022cb_terseLabel_en-US" xlink:label="lab_gmab_ImpactOnFinancialPositionTerminationOfServices" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total impact on financial position on termination of services</link:label>
    <link:label id="lab_gmab_ImpactOnFinancialPositionTerminationOfServices_label_en-US" xlink:label="lab_gmab_ImpactOnFinancialPositionTerminationOfServices" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Impact On Financial Position Termination of Services</link:label>
    <link:label id="lab_gmab_ImpactOnFinancialPositionTerminationOfServices_documentation_en-US" xlink:label="lab_gmab_ImpactOnFinancialPositionTerminationOfServices" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Total impact on financial position on termination of services</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_ImpactOnFinancialPositionTerminationOfServices" xlink:href="gmab-20251231.xsd#gmab_ImpactOnFinancialPositionTerminationOfServices"/>
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    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForResearchAndDevelopmentExpenseExplanatory_019bbbcc-5e30-79a6-884e-2e132b9e7247_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForResearchAndDevelopmentExpenseExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Research and Development Expenses and Projects</link:label>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForResearchAndDevelopmentExpenseExplanatory_label_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForResearchAndDevelopmentExpenseExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Description of accounting policy for research and development expense [text block]</link:label>
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    <link:label id="lab_gmab_CollaborationsAgreementRoyaltyObligationExpirationTermAfterFirstSaleOfProduct_524f93cf-8a07-4557-a047-85df97dee40b_terseLabel_en-US" xlink:label="lab_gmab_CollaborationsAgreementRoyaltyObligationExpirationTermAfterFirstSaleOfProduct" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Royalty obligation expiration term after first sale of product</link:label>
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    <link:label id="lab_ifrs-full_OtherComprehensiveIncomeBeforeTaxExchangeDifferencesOnTranslation_d27f516f-318d-4aa0-b5e8-b6f69dd80056_terseLabel_en-US" xlink:label="lab_ifrs-full_OtherComprehensiveIncomeBeforeTaxExchangeDifferencesOnTranslation" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Exchange differences on translation of foreign operations</link:label>
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    <link:label id="lab_ifrs-full_Level1OfFairValueHierarchyMember_c1804d7c-a7bd-436f-ad6e-36a1e983ddf9_terseLabel_en-US" xlink:label="lab_ifrs-full_Level1OfFairValueHierarchyMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Level 1</link:label>
    <link:label id="lab_ifrs-full_Level1OfFairValueHierarchyMember_label_en-US" xlink:label="lab_ifrs-full_Level1OfFairValueHierarchyMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Level 1 of fair value hierarchy [member]</link:label>
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    <link:label id="lab_gmab_GileadSciencesIncMember_019c0996-1b79-7f30-90fd-13ea69179007_terseLabel_en-US" xlink:label="lab_gmab_GileadSciencesIncMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Gilead Sciences, Inc</link:label>
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    <link:label id="lab_gmab_GileadSciencesIncMember_documentation_en-US" xlink:label="lab_gmab_GileadSciencesIncMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Gilead Sciences, Inc</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_GileadSciencesIncMember" xlink:href="gmab-20251231.xsd#gmab_GileadSciencesIncMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_GileadSciencesIncMember" xlink:to="lab_gmab_GileadSciencesIncMember" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_DisclosureOfCashOutflowForLeasesTableTextBlock_f40c9ee5-e676-4db6-b614-f6e3632ba598_terseLabel_en-US" xlink:label="lab_gmab_DisclosureOfCashOutflowForLeasesTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of cash outflow for leases</link:label>
    <link:label id="lab_gmab_DisclosureOfCashOutflowForLeasesTableTextBlock_label_en-US" xlink:label="lab_gmab_DisclosureOfCashOutflowForLeasesTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure Of Cash Outflow For Leases [Table Text Block]</link:label>
    <link:label id="lab_gmab_DisclosureOfCashOutflowForLeasesTableTextBlock_documentation_en-US" xlink:label="lab_gmab_DisclosureOfCashOutflowForLeasesTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Tabular disclosure of cash outflow for leases</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_DisclosureOfCashOutflowForLeasesTableTextBlock" xlink:href="gmab-20251231.xsd#gmab_DisclosureOfCashOutflowForLeasesTableTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_DisclosureOfCashOutflowForLeasesTableTextBlock" xlink:to="lab_gmab_DisclosureOfCashOutflowForLeasesTableTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_ExpensesOnGovernmentGrants_ae9e7844-350c-41a4-9b33-3b397095939c_terseLabel_en-US" xlink:label="lab_gmab_ExpensesOnGovernmentGrants" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Government grants related to research and development expenses</link:label>
    <link:label id="lab_gmab_ExpensesOnGovernmentGrants_label_en-US" xlink:label="lab_gmab_ExpensesOnGovernmentGrants" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Expenses On Government Grants</link:label>
    <link:label id="lab_gmab_ExpensesOnGovernmentGrants_documentation_en-US" xlink:label="lab_gmab_ExpensesOnGovernmentGrants" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The amount of expenses incurred on government grants.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_ExpensesOnGovernmentGrants" xlink:href="gmab-20251231.xsd#gmab_ExpensesOnGovernmentGrants"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_ExpensesOnGovernmentGrants" xlink:to="lab_gmab_ExpensesOnGovernmentGrants" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_e73f28b4-f13e-4293-aeb8-133b6d3ec132_verboseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Disclosure of detailed information about property, plant and equipment [line items]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_76361090-9dc7-488b-9c6a-09ffbeb73959_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Depreciation and impairment included in the income statement as follows:</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of detailed information about property, plant and equipment [line items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems" xlink:to="lab_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_EquipmentFurnitureAndFixturesMember_0bd5f69b-e6aa-428f-b882-7d962b5a4fe1_terseLabel_en-US" xlink:label="lab_gmab_EquipmentFurnitureAndFixturesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Equipment, furniture and fixtures</link:label>
    <link:label id="lab_gmab_EquipmentFurnitureAndFixturesMember_label_en-US" xlink:label="lab_gmab_EquipmentFurnitureAndFixturesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Equipment, Furniture and Fixtures [Member]</link:label>
    <link:label id="lab_gmab_EquipmentFurnitureAndFixturesMember_documentation_en-US" xlink:label="lab_gmab_EquipmentFurnitureAndFixturesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This member stand for Equipment, furniture and fixtures.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_EquipmentFurnitureAndFixturesMember" xlink:href="gmab-20251231.xsd#gmab_EquipmentFurnitureAndFixturesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_EquipmentFurnitureAndFixturesMember" xlink:to="lab_gmab_EquipmentFurnitureAndFixturesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_PercentageOfShareCapitalAttributedToExerciseOfWarrants_e062fb6a-9ccb-4e89-8142-d258c5308134_terseLabel_en-US" xlink:label="lab_gmab_PercentageOfShareCapitalAttributedToExerciseOfWarrants" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Percentage of change in share capital - warrants exercised</link:label>
    <link:label id="lab_gmab_PercentageOfShareCapitalAttributedToExerciseOfWarrants_label_en-US" xlink:label="lab_gmab_PercentageOfShareCapitalAttributedToExerciseOfWarrants" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Percentage Of Share Capital Attributed To Exercise Of Warrants</link:label>
    <link:label id="lab_gmab_PercentageOfShareCapitalAttributedToExerciseOfWarrants_documentation_en-US" xlink:label="lab_gmab_PercentageOfShareCapitalAttributedToExerciseOfWarrants" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Percentage of share capital attributed by exercise of warrants which increase the share capital.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_PercentageOfShareCapitalAttributedToExerciseOfWarrants" xlink:href="gmab-20251231.xsd#gmab_PercentageOfShareCapitalAttributedToExerciseOfWarrants"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_PercentageOfShareCapitalAttributedToExerciseOfWarrants" xlink:to="lab_gmab_PercentageOfShareCapitalAttributedToExerciseOfWarrants" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_Level2OfFairValueHierarchyMember_91fd03fc-7fb4-49f7-abf5-106effb5983f_terseLabel_en-US" xlink:label="lab_ifrs-full_Level2OfFairValueHierarchyMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Level 2</link:label>
    <link:label id="lab_ifrs-full_Level2OfFairValueHierarchyMember_label_en-US" xlink:label="lab_ifrs-full_Level2OfFairValueHierarchyMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Level 2 of fair value hierarchy [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Level2OfFairValueHierarchyMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Level2OfFairValueHierarchyMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_Level2OfFairValueHierarchyMember" xlink:to="lab_ifrs-full_Level2OfFairValueHierarchyMember" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_WeightedAverageFairValuePerWarrantOnGrantDate_e1442000-9b92-40cc-8cef-47e6fdf762ee_terseLabel_en-US" xlink:label="lab_gmab_WeightedAverageFairValuePerWarrantOnGrantDate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair value per warrant on grant date (in DKK per share)</link:label>
    <link:label id="lab_gmab_WeightedAverageFairValuePerWarrantOnGrantDate_label_en-US" xlink:label="lab_gmab_WeightedAverageFairValuePerWarrantOnGrantDate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Weighted Average Fair Value Per Warrant On Grant Date</link:label>
    <link:label id="lab_gmab_WeightedAverageFairValuePerWarrantOnGrantDate_documentation_en-US" xlink:label="lab_gmab_WeightedAverageFairValuePerWarrantOnGrantDate" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The weighted average fair value per warrant on grant date.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_WeightedAverageFairValuePerWarrantOnGrantDate" xlink:href="gmab-20251231.xsd#gmab_WeightedAverageFairValuePerWarrantOnGrantDate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_WeightedAverageFairValuePerWarrantOnGrantDate" xlink:to="lab_gmab_WeightedAverageFairValuePerWarrantOnGrantDate" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ReconciliationOfChangesInIntangibleAssetsAndGoodwillAbstract_019bb2b7-a771-75ec-89aa-a303252f658a_terseLabel_en-US" xlink:label="lab_ifrs-full_ReconciliationOfChangesInIntangibleAssetsAndGoodwillAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Reconciliation of changes in intangible assets and goodwill [abstract]</link:label>
    <link:label id="lab_ifrs-full_ReconciliationOfChangesInIntangibleAssetsAndGoodwillAbstract_label_en-US" xlink:label="lab_ifrs-full_ReconciliationOfChangesInIntangibleAssetsAndGoodwillAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Reconciliation of changes in intangible assets and goodwill [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ReconciliationOfChangesInIntangibleAssetsAndGoodwillAbstract" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ReconciliationOfChangesInIntangibleAssetsAndGoodwillAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ReconciliationOfChangesInIntangibleAssetsAndGoodwillAbstract" xlink:to="lab_ifrs-full_ReconciliationOfChangesInIntangibleAssetsAndGoodwillAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_PercentageOfPossibleIncreaseDecreaseInExchangeRate_4eb05ee2-ef3a-4144-b279-1d8c222805e6_terseLabel_en-US" xlink:label="lab_gmab_PercentageOfPossibleIncreaseDecreaseInExchangeRate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Percentage of possible increase or decrease in exchange rate</link:label>
    <link:label id="lab_gmab_PercentageOfPossibleIncreaseDecreaseInExchangeRate_label_en-US" xlink:label="lab_gmab_PercentageOfPossibleIncreaseDecreaseInExchangeRate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Percentage Of Possible Increase (Decrease) In Exchange rate</link:label>
    <link:label id="lab_gmab_PercentageOfPossibleIncreaseDecreaseInExchangeRate_documentation_en-US" xlink:label="lab_gmab_PercentageOfPossibleIncreaseDecreaseInExchangeRate" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Percentage of possible increase or decrease in exchange rate.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_PercentageOfPossibleIncreaseDecreaseInExchangeRate" xlink:href="gmab-20251231.xsd#gmab_PercentageOfPossibleIncreaseDecreaseInExchangeRate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_PercentageOfPossibleIncreaseDecreaseInExchangeRate" xlink:to="lab_gmab_PercentageOfPossibleIncreaseDecreaseInExchangeRate" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_WeightedAverageExercisePriceOfWarrantsGranted_fcb5ec6a-e648-40d2-b4d6-5c0229c0cf6a_terseLabel_en-US" xlink:label="lab_gmab_WeightedAverageExercisePriceOfWarrantsGranted" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Weighted average exercise price of warrant granted (in DKK per share)</link:label>
    <link:label id="lab_gmab_WeightedAverageExercisePriceOfWarrantsGranted_label_en-US" xlink:label="lab_gmab_WeightedAverageExercisePriceOfWarrantsGranted" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Weighted Average Exercise Price Of Warrants Granted</link:label>
    <link:label id="lab_gmab_WeightedAverageExercisePriceOfWarrantsGranted_documentation_en-US" xlink:label="lab_gmab_WeightedAverageExercisePriceOfWarrantsGranted" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Exercise price per share or per unit of warrants granted during the period.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_WeightedAverageExercisePriceOfWarrantsGranted" xlink:href="gmab-20251231.xsd#gmab_WeightedAverageExercisePriceOfWarrantsGranted"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_WeightedAverageExercisePriceOfWarrantsGranted" xlink:to="lab_gmab_WeightedAverageExercisePriceOfWarrantsGranted" xlink:type="arc" order="1"/>
    <link:label id="lab_currency_DKK_24f946fc-74b0-400e-9484-11f991bac505_terseLabel_en-US" xlink:label="lab_currency_DKK" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">DKK</link:label>
    <link:label id="lab_currency_DKK_label_en-US" xlink:label="lab_currency_DKK" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Denmark, Kroner</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_currency_DKK" xlink:href="https://xbrl.sec.gov/currency/2025/currency-2025.xsd#currency_DKK"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_currency_DKK" xlink:to="lab_currency_DKK" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_ShareholdingsByBoardOfDirectorAndExecutiveManagementLineItems_7f05c285-5aa6-41e2-93b3-ea4d2c0ebdfe_terseLabel_en-US" xlink:label="lab_gmab_ShareholdingsByBoardOfDirectorAndExecutiveManagementLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Shareholdings By Board of Director and Executive Management [Line Items]</link:label>
    <link:label id="lab_gmab_ShareholdingsByBoardOfDirectorAndExecutiveManagementLineItems_label_en-US" xlink:label="lab_gmab_ShareholdingsByBoardOfDirectorAndExecutiveManagementLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Shareholdings By Board of Director and Executive Management [Line Items]</link:label>
    <link:label id="lab_gmab_ShareholdingsByBoardOfDirectorAndExecutiveManagementLineItems_documentation_en-US" xlink:label="lab_gmab_ShareholdingsByBoardOfDirectorAndExecutiveManagementLineItems" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">na</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_ShareholdingsByBoardOfDirectorAndExecutiveManagementLineItems" xlink:href="gmab-20251231.xsd#gmab_ShareholdingsByBoardOfDirectorAndExecutiveManagementLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_ShareholdingsByBoardOfDirectorAndExecutiveManagementLineItems" xlink:to="lab_gmab_ShareholdingsByBoardOfDirectorAndExecutiveManagementLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DeferredTaxLiabilityAsset_019c47ff-c6c9-7a59-81c3-61ded28ecc5d_periodStartLabel_en-US" xlink:label="lab_ifrs-full_DeferredTaxLiabilityAsset" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Net deferred tax asset/(liability) at the beginning of the year</link:label>
    <link:label id="lab_ifrs-full_DeferredTaxLiabilityAsset_019c47ff-ff93-7ee9-a0d4-f292c0d8b3ec_periodEndLabel_en-US" xlink:label="lab_ifrs-full_DeferredTaxLiabilityAsset" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Net deferred tax asset/(liability) at the end of the year</link:label>
    <link:label id="lab_ifrs-full_DeferredTaxLiabilityAsset_label_en-US" xlink:label="lab_ifrs-full_DeferredTaxLiabilityAsset" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deferred tax liability (asset)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DeferredTaxLiabilityAsset" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DeferredTaxLiabilityAsset"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DeferredTaxLiabilityAsset" xlink:to="lab_ifrs-full_DeferredTaxLiabilityAsset" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_FinancialExpensesAbstract_019b082c-1171-7070-bf6f-d545f390dc2a_terseLabel_en-US" xlink:label="lab_gmab_FinancialExpensesAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Financial expenses:</link:label>
    <link:label id="lab_gmab_FinancialExpensesAbstract_label_en-US" xlink:label="lab_gmab_FinancialExpensesAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Financial Expenses [Abstract]</link:label>
    <link:label id="lab_gmab_FinancialExpensesAbstract_documentation_en-US" xlink:label="lab_gmab_FinancialExpensesAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Financial Expenses</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_FinancialExpensesAbstract" xlink:href="gmab-20251231.xsd#gmab_FinancialExpensesAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_FinancialExpensesAbstract" xlink:to="lab_gmab_FinancialExpensesAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CurrentLiabilities_4870fe13-4cd0-42fa-a02e-68a2144d26cb_totalLabel_en-US" xlink:label="lab_ifrs-full_CurrentLiabilities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total current liabilities</link:label>
    <link:label id="lab_ifrs-full_CurrentLiabilities_label_en-US" xlink:label="lab_ifrs-full_CurrentLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Current liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentLiabilities" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CurrentLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CurrentLiabilities" xlink:to="lab_ifrs-full_CurrentLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_CollaborationRevenueMember_88ff1440-c979-416a-b45f-f3741be7f2f5_terseLabel_en-US" xlink:label="lab_gmab_CollaborationRevenueMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Collaboration revenue</link:label>
    <link:label id="lab_gmab_CollaborationRevenueMember_label_en-US" xlink:label="lab_gmab_CollaborationRevenueMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Collaboration Revenue [Member]</link:label>
    <link:label id="lab_gmab_CollaborationRevenueMember_documentation_en-US" xlink:label="lab_gmab_CollaborationRevenueMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This member stands for collaboration revenue.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_CollaborationRevenueMember" xlink:href="gmab-20251231.xsd#gmab_CollaborationRevenueMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_CollaborationRevenueMember" xlink:to="lab_gmab_CollaborationRevenueMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_AdrMember_019b8ee5-f6a5-7270-8441-5d1f9f6a21b1_terseLabel_en-US" xlink:label="lab_dei_AdrMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">ADR</link:label>
    <link:label id="lab_dei_AdrMember_label_en-US" xlink:label="lab_dei_AdrMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">ADR [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AdrMember" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AdrMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_AdrMember" xlink:to="lab_dei_AdrMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_TransfersIntoLevel3OfFairValueHierarchyAssets_c7cb9f3c-b9fa-4856-87fc-5e97b75111c9_terseLabel_en-US" xlink:label="lab_ifrs-full_TransfersIntoLevel3OfFairValueHierarchyAssets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Transfer to level 3</link:label>
    <link:label id="lab_ifrs-full_TransfersIntoLevel3OfFairValueHierarchyAssets_label_en-US" xlink:label="lab_ifrs-full_TransfersIntoLevel3OfFairValueHierarchyAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Transfers into Level 3 of fair value hierarchy, assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TransfersIntoLevel3OfFairValueHierarchyAssets" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TransfersIntoLevel3OfFairValueHierarchyAssets"/>
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    <link:label id="lab_ifrs-full_Inventories_9964f460-5bdb-46c6-94e1-4b26f0ea0e9f_terseLabel_en-US" xlink:label="lab_ifrs-full_Inventories" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Inventories</link:label>
    <link:label id="lab_ifrs-full_Inventories_9a380e0e-0be1-4555-a839-7cbf928a2520_totalLabel_en-US" xlink:label="lab_ifrs-full_Inventories" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total inventories</link:label>
    <link:label id="lab_ifrs-full_Inventories_label_en-US" xlink:label="lab_ifrs-full_Inventories" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Current inventories</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Inventories" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Inventories"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_Inventories" xlink:to="lab_ifrs-full_Inventories" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_DocumentAccountingStandard_019b45b3-d9e9-72c9-aedb-29659a3c762a_terseLabel_en-US" xlink:label="lab_dei_DocumentAccountingStandard" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Document Accounting Standard</link:label>
    <link:label id="lab_dei_DocumentAccountingStandard_label_en-US" xlink:label="lab_dei_DocumentAccountingStandard" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Document Accounting Standard</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentAccountingStandard" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentAccountingStandard"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_DocumentAccountingStandard" xlink:to="lab_dei_DocumentAccountingStandard" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems_2f658a49-e462-4d5d-ab9e-1ec25e279a67_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure of temporary difference, unused tax losses and unused tax credits [line items]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of temporary difference, unused tax losses and unused tax credits [line items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems"/>
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    <link:label id="lab_gmab_WeightedAverageExercisePriceOfWarrantsExpired_d6268ca0-3aac-4a0f-bbe3-dfd6e270ecbf_terseLabel_en-US" xlink:label="lab_gmab_WeightedAverageExercisePriceOfWarrantsExpired" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Weighted average exercise price of warrants expired (in DKK per share)</link:label>
    <link:label id="lab_gmab_WeightedAverageExercisePriceOfWarrantsExpired_label_en-US" xlink:label="lab_gmab_WeightedAverageExercisePriceOfWarrantsExpired" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Weighted Average Exercise Price Of Warrants Expired</link:label>
    <link:label id="lab_gmab_WeightedAverageExercisePriceOfWarrantsExpired_documentation_en-US" xlink:label="lab_gmab_WeightedAverageExercisePriceOfWarrantsExpired" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Exercise price per share or per unit of warrants expired during the period.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_WeightedAverageExercisePriceOfWarrantsExpired" xlink:href="gmab-20251231.xsd#gmab_WeightedAverageExercisePriceOfWarrantsExpired"/>
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    <link:label id="lab_gmab_OtherCurrentAssetsRecognisedAsOfAcquisitionDate_5b1ed672-a883-40c9-8ab8-3f32fd2d0db7_terseLabel_en-US" xlink:label="lab_gmab_OtherCurrentAssetsRecognisedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other current assets</link:label>
    <link:label id="lab_gmab_OtherCurrentAssetsRecognisedAsOfAcquisitionDate_label_en-US" xlink:label="lab_gmab_OtherCurrentAssetsRecognisedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Current Assets Recognised As Of Acquisition Date</link:label>
    <link:label id="lab_gmab_OtherCurrentAssetsRecognisedAsOfAcquisitionDate_documentation_en-US" xlink:label="lab_gmab_OtherCurrentAssetsRecognisedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The amount recognised as of the acquisition date for other current assets acquired in a business combination.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_OtherCurrentAssetsRecognisedAsOfAcquisitionDate" xlink:href="gmab-20251231.xsd#gmab_OtherCurrentAssetsRecognisedAsOfAcquisitionDate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_OtherCurrentAssetsRecognisedAsOfAcquisitionDate" xlink:to="lab_gmab_OtherCurrentAssetsRecognisedAsOfAcquisitionDate" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForSharebasedPaymentTransactionsExplanatory_019bc725-4816-7756-8b71-c059625aecd0_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForSharebasedPaymentTransactionsExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share-Based Instruments</link:label>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForSharebasedPaymentTransactionsExplanatory_label_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForSharebasedPaymentTransactionsExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Description of accounting policy for share-based payment transactions [text block]</link:label>
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    <link:label id="lab_gmab_GenmabFinanceLLCMember_019b07a8-ee1e-7459-b760-86597ee90d2d_terseLabel_en-US" xlink:label="lab_gmab_GenmabFinanceLLCMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Genmab Finance LLC.</link:label>
    <link:label id="lab_gmab_GenmabFinanceLLCMember_label_en-US" xlink:label="lab_gmab_GenmabFinanceLLCMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Genmab Finance LLC [Member]</link:label>
    <link:label id="lab_gmab_GenmabFinanceLLCMember_documentation_en-US" xlink:label="lab_gmab_GenmabFinanceLLCMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Genmab Finance LLC</link:label>
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    <link:label id="lab_ifrs-full_StatementOfChangesInEquityAbstract_label_en-US" xlink:label="lab_ifrs-full_StatementOfChangesInEquityAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Statement of changes in equity [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_StatementOfChangesInEquityAbstract" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_StatementOfChangesInEquityAbstract"/>
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    <link:label id="lab_ifrs-full_RetainedEarnings_d1534a02-e627-4868-8253-4f8d587478b8_verboseLabel_en-US" xlink:label="lab_ifrs-full_RetainedEarnings" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Retained earnings</link:label>
    <link:label id="lab_ifrs-full_RetainedEarnings_label_en-US" xlink:label="lab_ifrs-full_RetainedEarnings" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Retained earnings</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RetainedEarnings" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RetainedEarnings"/>
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    <link:label id="lab_ifrs-full_MeasurementDomain_2e8da116-ae30-4325-9139-09ecc7ac5b26_terseLabel_en-US" xlink:label="lab_ifrs-full_MeasurementDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Measurement [domain]</link:label>
    <link:label id="lab_ifrs-full_MeasurementDomain_label_en-US" xlink:label="lab_ifrs-full_MeasurementDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Measurement [domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MeasurementDomain" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MeasurementDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_MeasurementDomain" xlink:to="lab_ifrs-full_MeasurementDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfDetailedInformationAboutBusinessCombinationsExplanatory_8d8da65b-5768-43b0-89fc-80afa13c7119_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfDetailedInformationAboutBusinessCombinationsExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of details of acquisition</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfDetailedInformationAboutBusinessCombinationsExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfDetailedInformationAboutBusinessCombinationsExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of detailed information about business combination [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfDetailedInformationAboutBusinessCombinationsExplanatory" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfDetailedInformationAboutBusinessCombinationsExplanatory"/>
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    <link:label id="lab_gmab_CommitmentsAndContingenciesAbstract_bd6d1f12-15dd-4fa7-82d2-d294cf713e74_terseLabel_en-US" xlink:label="lab_gmab_CommitmentsAndContingenciesAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Commitments and Contingencies [Abstract]</link:label>
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    <link:label id="lab_gmab_CommitmentsAndContingenciesAbstract_documentation_en-US" xlink:label="lab_gmab_CommitmentsAndContingenciesAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">na</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_CommitmentsAndContingenciesAbstract" xlink:href="gmab-20251231.xsd#gmab_CommitmentsAndContingenciesAbstract"/>
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    <link:label id="lab_ifrs-full_ProvisionsForEmployeeBenefits_8ee5f628-442e-47ad-b784-ad78a7126d26_terseLabel_en-US" xlink:label="lab_ifrs-full_ProvisionsForEmployeeBenefits" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Staff cost liabilities</link:label>
    <link:label id="lab_ifrs-full_ProvisionsForEmployeeBenefits_label_en-US" xlink:label="lab_ifrs-full_ProvisionsForEmployeeBenefits" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Provisions for employee benefits</link:label>
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    <link:label id="lab_gmab_StaffCostsIncludedInResearchAndDevelopmentExpenses_dfd62fd3-681a-4bd5-8ffb-fad06a3cb21c_terseLabel_en-US" xlink:label="lab_gmab_StaffCostsIncludedInResearchAndDevelopmentExpenses" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Research and development expenses</link:label>
    <link:label id="lab_gmab_StaffCostsIncludedInResearchAndDevelopmentExpenses_label_en-US" xlink:label="lab_gmab_StaffCostsIncludedInResearchAndDevelopmentExpenses" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Staff Costs Included In Research And Development Expenses</link:label>
    <link:label id="lab_gmab_StaffCostsIncludedInResearchAndDevelopmentExpenses_documentation_en-US" xlink:label="lab_gmab_StaffCostsIncludedInResearchAndDevelopmentExpenses" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The amount of staff cost included in research and development expenses.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_StaffCostsIncludedInResearchAndDevelopmentExpenses" xlink:href="gmab-20251231.xsd#gmab_StaffCostsIncludedInResearchAndDevelopmentExpenses"/>
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    <link:label id="lab_ifrs-full_MaximumExposureToCreditRisk_3e090e46-8768-4f2d-8aa3-e449583033aa_terseLabel_en-US" xlink:label="lab_ifrs-full_MaximumExposureToCreditRisk" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Maximum credit exposure</link:label>
    <link:label id="lab_ifrs-full_MaximumExposureToCreditRisk_label_en-US" xlink:label="lab_ifrs-full_MaximumExposureToCreditRisk" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Maximum exposure to credit risk</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MaximumExposureToCreditRisk" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MaximumExposureToCreditRisk"/>
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    <link:label id="lab_ifrs-full_DisclosureOfDeferredIncomeExplanatory_c95e87e8-88bc-44ba-8a2e-f485a4179715_verboseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfDeferredIncomeExplanatory" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Schedule of contract liabilities</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfDeferredIncomeExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfDeferredIncomeExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of deferred income [text block]</link:label>
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    <link:label id="lab_ifrs-full_DisclosureOfFinancialInstrumentsLineItems_ed0eebd2-8d80-4747-8796-e7992b0dfa2e_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfFinancialInstrumentsLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure of detailed information about financial instruments [line items]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfFinancialInstrumentsLineItems_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfFinancialInstrumentsLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of detailed information about financial instruments [line items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFinancialInstrumentsLineItems" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfFinancialInstrumentsLineItems"/>
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    <link:label id="lab_gmab_GainsOnOtherInvestmentsNet_019b07cd-59dc-7653-9617-107ea7cc27af_terseLabel_en-US" xlink:label="lab_gmab_GainsOnOtherInvestmentsNet" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Gain on other investments, net</link:label>
    <link:label id="lab_gmab_GainsOnOtherInvestmentsNet_label_en-US" xlink:label="lab_gmab_GainsOnOtherInvestmentsNet" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Gains On Other Investments, Net</link:label>
    <link:label id="lab_gmab_GainsOnOtherInvestmentsNet_documentation_en-US" xlink:label="lab_gmab_GainsOnOtherInvestmentsNet" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Gains On Other Investments, Net</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_GainsOnOtherInvestmentsNet" xlink:href="gmab-20251231.xsd#gmab_GainsOnOtherInvestmentsNet"/>
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    <link:label id="lab_ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted_1b18d129-ae86-40d8-b0f9-39ea7f849898_terseLabel_en-US" xlink:label="lab_ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Granted (in shares)</link:label>
    <link:label id="lab_ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted_label_en-US" xlink:label="lab_ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number of other equity instruments granted in share-based payment arrangement</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted"/>
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    <link:label id="lab_ifrs-full_TypesOfRisksDomain_7d113f2c-64c5-46aa-9271-cbf66ed649b5_terseLabel_en-US" xlink:label="lab_ifrs-full_TypesOfRisksDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Types of risks [domain]</link:label>
    <link:label id="lab_ifrs-full_TypesOfRisksDomain_label_en-US" xlink:label="lab_ifrs-full_TypesOfRisksDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Types of risks [domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfRisksDomain" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfRisksDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_TypesOfRisksDomain" xlink:to="lab_ifrs-full_TypesOfRisksDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AdjustmentsForDecreaseIncreaseInTradeAndOtherReceivables_3ee005f4-4da2-43bf-af11-88de155f95a5_terseLabel_en-US" xlink:label="lab_ifrs-full_AdjustmentsForDecreaseIncreaseInTradeAndOtherReceivables" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Receivables</link:label>
    <link:label id="lab_ifrs-full_AdjustmentsForDecreaseIncreaseInTradeAndOtherReceivables_label_en-US" xlink:label="lab_ifrs-full_AdjustmentsForDecreaseIncreaseInTradeAndOtherReceivables" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Adjustments for decrease (increase) in trade and other receivables</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForDecreaseIncreaseInTradeAndOtherReceivables" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AdjustmentsForDecreaseIncreaseInTradeAndOtherReceivables"/>
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    <link:label id="lab_dei_LegalEntityAxis_abac311f-c2af-4f6b-b399-c6e542ebb851_terseLabel_en-US" xlink:label="lab_dei_LegalEntityAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Legal Entity [Axis]</link:label>
    <link:label id="lab_dei_LegalEntityAxis_label_en-US" xlink:label="lab_dei_LegalEntityAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Legal Entity [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
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    <link:label id="lab_ifrs-full_SignificantInvestmentsInSubsidiariesAxis_0e4ca661-e6a5-45a3-9961-285d182950fc_terseLabel_en-US" xlink:label="lab_ifrs-full_SignificantInvestmentsInSubsidiariesAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Subsidiaries [axis]</link:label>
    <link:label id="lab_ifrs-full_SignificantInvestmentsInSubsidiariesAxis_label_en-US" xlink:label="lab_ifrs-full_SignificantInvestmentsInSubsidiariesAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Subsidiaries [axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SignificantInvestmentsInSubsidiariesAxis" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SignificantInvestmentsInSubsidiariesAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesAxis" xlink:to="lab_ifrs-full_SignificantInvestmentsInSubsidiariesAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_InterestPaidClassifiedAsOperatingActivities_2d35bce8-9d48-43ea-879c-83495a6d257c_negatedTerseLabel_en-US" xlink:label="lab_ifrs-full_InterestPaidClassifiedAsOperatingActivities" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Interest paid</link:label>
    <link:label id="lab_ifrs-full_InterestPaidClassifiedAsOperatingActivities_label_en-US" xlink:label="lab_ifrs-full_InterestPaidClassifiedAsOperatingActivities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Interest paid, classified as operating activities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InterestPaidClassifiedAsOperatingActivities" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_InterestPaidClassifiedAsOperatingActivities"/>
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    <link:label id="lab_srt_SegmentGeographicalDomain_019c4848-676d-740f-9283-f66893c06343_terseLabel_en-US" xlink:label="lab_srt_SegmentGeographicalDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Geographical [Domain]</link:label>
    <link:label id="lab_srt_SegmentGeographicalDomain_label_en-US" xlink:label="lab_srt_SegmentGeographicalDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Geographical [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_SegmentGeographicalDomain" xlink:to="lab_srt_SegmentGeographicalDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_WeightedAverageExercisePriceOfWarrantsExercisable_0fe2d42a-4d5e-422c-b7c6-eac8b3b0b57f_terseLabel_en-US" xlink:label="lab_gmab_WeightedAverageExercisePriceOfWarrantsExercisable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Weighted average exercise price of warrants exercisable (in DKK per share)</link:label>
    <link:label id="lab_gmab_WeightedAverageExercisePriceOfWarrantsExercisable_label_en-US" xlink:label="lab_gmab_WeightedAverageExercisePriceOfWarrantsExercisable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Weighted Average Exercise Price Of Warrants Exercisable</link:label>
    <link:label id="lab_gmab_WeightedAverageExercisePriceOfWarrantsExercisable_documentation_en-US" xlink:label="lab_gmab_WeightedAverageExercisePriceOfWarrantsExercisable" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Exercise price per share or per unit of warrants exercisable during the period.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_WeightedAverageExercisePriceOfWarrantsExercisable" xlink:href="gmab-20251231.xsd#gmab_WeightedAverageExercisePriceOfWarrantsExercisable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_WeightedAverageExercisePriceOfWarrantsExercisable" xlink:to="lab_gmab_WeightedAverageExercisePriceOfWarrantsExercisable" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_NumberOfWarrantsGrantedDuringPeriod_cde18f8e-82ce-4b57-ba3f-15e46355a273_terseLabel_en-US" xlink:label="lab_gmab_NumberOfWarrantsGrantedDuringPeriod" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Granted (in shares)</link:label>
    <link:label id="lab_gmab_NumberOfWarrantsGrantedDuringPeriod_label_en-US" xlink:label="lab_gmab_NumberOfWarrantsGrantedDuringPeriod" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number Of Warrants Granted During Period</link:label>
    <link:label id="lab_gmab_NumberOfWarrantsGrantedDuringPeriod_documentation_en-US" xlink:label="lab_gmab_NumberOfWarrantsGrantedDuringPeriod" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The number of warrants granted during period.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_NumberOfWarrantsGrantedDuringPeriod" xlink:href="gmab-20251231.xsd#gmab_NumberOfWarrantsGrantedDuringPeriod"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_NumberOfWarrantsGrantedDuringPeriod" xlink:to="lab_gmab_NumberOfWarrantsGrantedDuringPeriod" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForSegmentReportingExplanatory_019bbbe2-ee04-7766-b73b-e72c35f01a40_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForSegmentReportingExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Geographical Areas</link:label>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForSegmentReportingExplanatory_label_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForSegmentReportingExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Description of accounting policy for segment reporting [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForSegmentReportingExplanatory" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DescriptionOfAccountingPolicyForSegmentReportingExplanatory"/>
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    <link:label id="lab_gmab_ShareRepurchasePercentageOfShareCapitalAuthorized_019b2cf6-a7a2-759b-a2d5-9096a6e899f3_terseLabel_en-US" xlink:label="lab_gmab_ShareRepurchasePercentageOfShareCapitalAuthorized" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share Repurchase, percentage of share capital authorized</link:label>
    <link:label id="lab_gmab_ShareRepurchasePercentageOfShareCapitalAuthorized_label_en-US" xlink:label="lab_gmab_ShareRepurchasePercentageOfShareCapitalAuthorized" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share Repurchase, Percentage of Share Capital Authorized</link:label>
    <link:label id="lab_gmab_ShareRepurchasePercentageOfShareCapitalAuthorized_documentation_en-US" xlink:label="lab_gmab_ShareRepurchasePercentageOfShareCapitalAuthorized" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Share Repurchase, Percentage of Share Capital Authorized</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_ShareRepurchasePercentageOfShareCapitalAuthorized" xlink:href="gmab-20251231.xsd#gmab_ShareRepurchasePercentageOfShareCapitalAuthorized"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_ShareRepurchasePercentageOfShareCapitalAuthorized" xlink:to="lab_gmab_ShareRepurchasePercentageOfShareCapitalAuthorized" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_GeographicalAreasAxis_786bc666-d019-4035-8c52-2edbd9f7e6c5_terseLabel_en-US" xlink:label="lab_ifrs-full_GeographicalAreasAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Geographical areas [axis]</link:label>
    <link:label id="lab_ifrs-full_GeographicalAreasAxis_label_en-US" xlink:label="lab_ifrs-full_GeographicalAreasAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Geographical areas [axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GeographicalAreasAxis" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GeographicalAreasAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_GeographicalAreasAxis" xlink:to="lab_ifrs-full_GeographicalAreasAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AdjustmentsForFinanceIncome_0f88eb6a-d971-40d3-bf1b-af451ba2e6b3_negatedLabel_en-US" xlink:label="lab_ifrs-full_AdjustmentsForFinanceIncome" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Financial income</link:label>
    <link:label id="lab_ifrs-full_AdjustmentsForFinanceIncome_label_en-US" xlink:label="lab_ifrs-full_AdjustmentsForFinanceIncome" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Adjustments for finance income</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForFinanceIncome" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AdjustmentsForFinanceIncome"/>
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    <link:label id="lab_gmab_MerusB.V.Member_019b07a9-b5b2-721b-a71c-4742d423e341_terseLabel_en-US" xlink:label="lab_gmab_MerusB.V.Member" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Merus B.V.</link:label>
    <link:label id="lab_gmab_MerusB.V.Member_019be4f6-4585-7096-a377-ce31cef6ae70_verboseLabel_en-US" xlink:label="lab_gmab_MerusB.V.Member" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Merus N.V.</link:label>
    <link:label id="lab_gmab_MerusB.V.Member_label_en-US" xlink:label="lab_gmab_MerusB.V.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Merus B.V. [Member]</link:label>
    <link:label id="lab_gmab_MerusB.V.Member_documentation_en-US" xlink:label="lab_gmab_MerusB.V.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Merus B.V.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_MerusB.V.Member" xlink:href="gmab-20251231.xsd#gmab_MerusB.V.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_MerusB.V.Member" xlink:to="lab_gmab_MerusB.V.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_PerformanceObligationsSatisfiedAtPointInTimeMember_798a8a98-e259-4e4a-968a-6c39e67fff5a_terseLabel_en-US" xlink:label="lab_ifrs-full_PerformanceObligationsSatisfiedAtPointInTimeMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Performance obligations satisfied at point in time</link:label>
    <link:label id="lab_ifrs-full_PerformanceObligationsSatisfiedAtPointInTimeMember_label_en-US" xlink:label="lab_ifrs-full_PerformanceObligationsSatisfiedAtPointInTimeMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Performance obligations satisfied at point in time [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PerformanceObligationsSatisfiedAtPointInTimeMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PerformanceObligationsSatisfiedAtPointInTimeMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_PerformanceObligationsSatisfiedAtPointInTimeMember" xlink:to="lab_ifrs-full_PerformanceObligationsSatisfiedAtPointInTimeMember" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_WeightedAverageExpectedVolatilityWarrantsGranted_9c0b3e79-7cba-4f5c-af69-58d6b5453cb2_terseLabel_en-US" xlink:label="lab_gmab_WeightedAverageExpectedVolatilityWarrantsGranted" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Expected stock price volatility</link:label>
    <link:label id="lab_gmab_WeightedAverageExpectedVolatilityWarrantsGranted_label_en-US" xlink:label="lab_gmab_WeightedAverageExpectedVolatilityWarrantsGranted" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Weighted Average Expected Volatility, Warrants Granted</link:label>
    <link:label id="lab_gmab_WeightedAverageExpectedVolatilityWarrantsGranted_documentation_en-US" xlink:label="lab_gmab_WeightedAverageExpectedVolatilityWarrantsGranted" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The expected volatility of the share price used to calculate the fair value of warrants granted.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_WeightedAverageExpectedVolatilityWarrantsGranted" xlink:href="gmab-20251231.xsd#gmab_WeightedAverageExpectedVolatilityWarrantsGranted"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_WeightedAverageExpectedVolatilityWarrantsGranted" xlink:to="lab_gmab_WeightedAverageExpectedVolatilityWarrantsGranted" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_NoncurrentLeaseLiabilities_bc3d7302-9488-42ae-86b9-7ae98a68b5ac_terseLabel_en-US" xlink:label="lab_ifrs-full_NoncurrentLeaseLiabilities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Lease liabilities</link:label>
    <link:label id="lab_ifrs-full_NoncurrentLeaseLiabilities_eafceda5-4f07-478a-a8a8-2ec321e94742_verboseLabel_en-US" xlink:label="lab_ifrs-full_NoncurrentLeaseLiabilities" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Non-current</link:label>
    <link:label id="lab_ifrs-full_NoncurrentLeaseLiabilities_label_en-US" xlink:label="lab_ifrs-full_NoncurrentLeaseLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Non-current lease liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentLeaseLiabilities" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NoncurrentLeaseLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_NoncurrentLeaseLiabilities" xlink:to="lab_ifrs-full_NoncurrentLeaseLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityCommonStockSharesOutstanding_019b0cf0-94e2-7a3a-a4ea-f7770a97e067_terseLabel_en-US" xlink:label="lab_dei_EntityCommonStockSharesOutstanding" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Common Stock, Shares Outstanding</link:label>
    <link:label id="lab_dei_EntityCommonStockSharesOutstanding_label_en-US" xlink:label="lab_dei_EntityCommonStockSharesOutstanding" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Common Stock, Shares Outstanding</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCommonStockSharesOutstanding" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCommonStockSharesOutstanding"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityCommonStockSharesOutstanding" xlink:to="lab_dei_EntityCommonStockSharesOutstanding" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_AmountOfSeekingAnAwardInSecondArbitration_a555bc8c-c2e6-42e1-9907-cad66b6c9148_terseLabel_en-US" xlink:label="lab_gmab_AmountOfSeekingAnAwardInSecondArbitration" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Amount of seeking an award</link:label>
    <link:label id="lab_gmab_AmountOfSeekingAnAwardInSecondArbitration_label_en-US" xlink:label="lab_gmab_AmountOfSeekingAnAwardInSecondArbitration" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Amount Of Seeking An Award In Second Arbitration</link:label>
    <link:label id="lab_gmab_AmountOfSeekingAnAwardInSecondArbitration_documentation_en-US" xlink:label="lab_gmab_AmountOfSeekingAnAwardInSecondArbitration" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the amount of seeking an award in this second arbitration.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_AmountOfSeekingAnAwardInSecondArbitration" xlink:href="gmab-20251231.xsd#gmab_AmountOfSeekingAnAwardInSecondArbitration"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_AmountOfSeekingAnAwardInSecondArbitration" xlink:to="lab_gmab_AmountOfSeekingAnAwardInSecondArbitration" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_IntangibleAssetsOtherThanGoodwill_5246d641-b826-420c-a1f4-bac5a51157e0_terseLabel_en-US" xlink:label="lab_ifrs-full_IntangibleAssetsOtherThanGoodwill" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other intangible assets</link:label>
    <link:label id="lab_ifrs-full_IntangibleAssetsOtherThanGoodwill_label_en-US" xlink:label="lab_ifrs-full_IntangibleAssetsOtherThanGoodwill" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Intangible assets other than goodwill</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IntangibleAssetsOtherThanGoodwill" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IntangibleAssetsOtherThanGoodwill"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_IntangibleAssetsOtherThanGoodwill" xlink:to="lab_ifrs-full_IntangibleAssetsOtherThanGoodwill" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_DocumentFinStmtErrorCorrectionFlag_019b45b3-6cc0-73b8-a8e1-85b7e57fdb96_terseLabel_en-US" xlink:label="lab_dei_DocumentFinStmtErrorCorrectionFlag" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Document Financial Statement Error Correction [Flag]</link:label>
    <link:label id="lab_dei_DocumentFinStmtErrorCorrectionFlag_label_en-US" xlink:label="lab_dei_DocumentFinStmtErrorCorrectionFlag" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Document Financial Statement Error Correction [Flag]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFinStmtErrorCorrectionFlag" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentFinStmtErrorCorrectionFlag"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_DocumentFinStmtErrorCorrectionFlag" xlink:to="lab_dei_DocumentFinStmtErrorCorrectionFlag" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfFairValueMeasurementOfAssetsTable_62e73002-01c2-4f31-8234-84169aa3a0da_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfFairValueMeasurementOfAssetsTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure of fair value measurement of assets [table]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfFairValueMeasurementOfAssetsTable_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfFairValueMeasurementOfAssetsTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of fair value measurement of assets [table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFairValueMeasurementOfAssetsTable" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfFairValueMeasurementOfAssetsTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfFairValueMeasurementOfAssetsTable" xlink:to="lab_ifrs-full_DisclosureOfFairValueMeasurementOfAssetsTable" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_GregMuellerMember_019bbd21-20ce-71a0-bcea-51729ca9297d_terseLabel_en-US" xlink:label="lab_gmab_GregMuellerMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Greg Mueller</link:label>
    <link:label id="lab_gmab_GregMuellerMember_label_en-US" xlink:label="lab_gmab_GregMuellerMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Greg Mueller [Member]</link:label>
    <link:label id="lab_gmab_GregMuellerMember_documentation_en-US" xlink:label="lab_gmab_GregMuellerMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Greg Mueller</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_GregMuellerMember" xlink:href="gmab-20251231.xsd#gmab_GregMuellerMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_GregMuellerMember" xlink:to="lab_gmab_GregMuellerMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CashAndCashEquivalents_eef9eac9-1912-42e8-a853-26e7951f3811_terseLabel_en-US" xlink:label="lab_ifrs-full_CashAndCashEquivalents" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash and cash equivalents</link:label>
    <link:label id="lab_ifrs-full_CashAndCashEquivalents_598f32d1-254c-494c-b840-79d38740457e_periodStartLabel_en-US" xlink:label="lab_ifrs-full_CashAndCashEquivalents" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Cash and cash equivalents at the beginning of the period</link:label>
    <link:label id="lab_ifrs-full_CashAndCashEquivalents_d8867522-eac9-4b97-9ff4-4e1fd6047492_periodEndLabel_en-US" xlink:label="lab_ifrs-full_CashAndCashEquivalents" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Cash and cash equivalents at the end of the period</link:label>
    <link:label id="lab_ifrs-full_CashAndCashEquivalents_019bbb9c-d755-786d-a518-40d54f759775_totalLabel_en-US" xlink:label="lab_ifrs-full_CashAndCashEquivalents" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Cash and cash equivalents at the end of the period</link:label>
    <link:label id="lab_ifrs-full_CashAndCashEquivalents_label_en-US" xlink:label="lab_ifrs-full_CashAndCashEquivalents" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash and cash equivalents</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashAndCashEquivalents" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CashAndCashEquivalents"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CashAndCashEquivalents" xlink:to="lab_ifrs-full_CashAndCashEquivalents" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_FinancialIncomeLineItems_f283a0df-09e7-44fb-8859-60c5ee84a0af_terseLabel_en-US" xlink:label="lab_gmab_FinancialIncomeLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Financial income:</link:label>
    <link:label id="lab_gmab_FinancialIncomeLineItems_label_en-US" xlink:label="lab_gmab_FinancialIncomeLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Financial Income: [Line Items]</link:label>
    <link:label id="lab_gmab_FinancialIncomeLineItems_documentation_en-US" xlink:label="lab_gmab_FinancialIncomeLineItems" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">na</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_FinancialIncomeLineItems" xlink:href="gmab-20251231.xsd#gmab_FinancialIncomeLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_FinancialIncomeLineItems" xlink:to="lab_gmab_FinancialIncomeLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ProceedsFromSalesOfInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethod_f7e84c9e-84f7-45f2-8575-fa3812c74372_terseLabel_en-US" xlink:label="lab_ifrs-full_ProceedsFromSalesOfInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethod" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Marketable securities sold</link:label>
    <link:label id="lab_ifrs-full_ProceedsFromSalesOfInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethod_label_en-US" xlink:label="lab_ifrs-full_ProceedsFromSalesOfInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethod" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proceeds from sales of investments other than investments accounted for using equity method</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProceedsFromSalesOfInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethod" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProceedsFromSalesOfInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethod"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ProceedsFromSalesOfInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethod" xlink:to="lab_ifrs-full_ProceedsFromSalesOfInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethod" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_DocumentInformationTable_019b0cd2-9c75-7d7a-a992-af7eb1201ac7_terseLabel_en-US" xlink:label="lab_dei_DocumentInformationTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Document Information [Table]</link:label>
    <link:label id="lab_dei_DocumentInformationTable_label_en-US" xlink:label="lab_dei_DocumentInformationTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Document Information [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationTable" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentInformationTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_DocumentInformationTable" xlink:to="lab_dei_DocumentInformationTable" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_NetProductSalesMember_1d96129b-0650-413e-805d-9f619639acbd_terseLabel_en-US" xlink:label="lab_gmab_NetProductSalesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net product Sales</link:label>
    <link:label id="lab_gmab_NetProductSalesMember_label_en-US" xlink:label="lab_gmab_NetProductSalesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Product Sales [Member]</link:label>
    <link:label id="lab_gmab_NetProductSalesMember_documentation_en-US" xlink:label="lab_gmab_NetProductSalesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This member stands for net product sales</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_NetProductSalesMember" xlink:href="gmab-20251231.xsd#gmab_NetProductSalesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_NetProductSalesMember" xlink:to="lab_gmab_NetProductSalesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_RatioOfSharingPreTaxProfits_23f55ad4-e9dd-4b6e-96b8-a3043b43dc89_terseLabel_en-US" xlink:label="lab_gmab_RatioOfSharingPreTaxProfits" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Ratio of sharing pre tax profits</link:label>
    <link:label id="lab_gmab_RatioOfSharingPreTaxProfits_label_en-US" xlink:label="lab_gmab_RatioOfSharingPreTaxProfits" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Ratio of Sharing The Pre Tax Profits</link:label>
    <link:label id="lab_gmab_RatioOfSharingPreTaxProfits_documentation_en-US" xlink:label="lab_gmab_RatioOfSharingPreTaxProfits" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The ratio of sharing pre tax profits during the period.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_RatioOfSharingPreTaxProfits" xlink:href="gmab-20251231.xsd#gmab_RatioOfSharingPreTaxProfits"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_RatioOfSharingPreTaxProfits" xlink:to="lab_gmab_RatioOfSharingPreTaxProfits" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsExplanatory_019b27be-caab-755c-ada0-bdb16ac036b1_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of borrowings</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of detailed information about borrowings [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsExplanatory" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsExplanatory" xlink:to="lab_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_EquityAndLiabilities_4b18ebef-59e2-434f-ac3b-41b4df34eff8_totalLabel_en-US" xlink:label="lab_ifrs-full_EquityAndLiabilities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total shareholders' equity and liabilities</link:label>
    <link:label id="lab_ifrs-full_EquityAndLiabilities_label_en-US" xlink:label="lab_ifrs-full_EquityAndLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Equity and liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EquityAndLiabilities" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_EquityAndLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_EquityAndLiabilities" xlink:to="lab_ifrs-full_EquityAndLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_country_US_a2611ddb-aad7-4ad4-aa1d-e57b08fd74cd_terseLabel_en-US" xlink:label="lab_country_US" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">United States</link:label>
    <link:label id="lab_country_US_label_en-US" xlink:label="lab_country_US" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">UNITED STATES</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_country_US" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_US"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_country_US" xlink:to="lab_country_US" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_PaymentOfWithholdingTaxesOnBehalfOfEmployeesOnNetSettledRSUs_5a1a9104-e469-47bf-a94e-7e210197d724_negatedLabel_en-US" xlink:label="lab_gmab_PaymentOfWithholdingTaxesOnBehalfOfEmployeesOnNetSettledRSUs" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Payment of withholding taxes on behalf of employees on net settled RSUs</link:label>
    <link:label id="lab_gmab_PaymentOfWithholdingTaxesOnBehalfOfEmployeesOnNetSettledRSUs_label_en-US" xlink:label="lab_gmab_PaymentOfWithholdingTaxesOnBehalfOfEmployeesOnNetSettledRSUs" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payment Of Withholding Taxes On Behalf Of Employees On Net Settled RSUs</link:label>
    <link:label id="lab_gmab_PaymentOfWithholdingTaxesOnBehalfOfEmployeesOnNetSettledRSUs_documentation_en-US" xlink:label="lab_gmab_PaymentOfWithholdingTaxesOnBehalfOfEmployeesOnNetSettledRSUs" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The cash outflow for withholding taxes on behalf of employees on net settled restricted stock units (RSUs).</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_PaymentOfWithholdingTaxesOnBehalfOfEmployeesOnNetSettledRSUs" xlink:href="gmab-20251231.xsd#gmab_PaymentOfWithholdingTaxesOnBehalfOfEmployeesOnNetSettledRSUs"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_PaymentOfWithholdingTaxesOnBehalfOfEmployeesOnNetSettledRSUs" xlink:to="lab_gmab_PaymentOfWithholdingTaxesOnBehalfOfEmployeesOnNetSettledRSUs" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_JudithKlimovskyMember_47f7d820-3ac2-4c4f-8366-e13f0be47afe_terseLabel_en-US" xlink:label="lab_gmab_JudithKlimovskyMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Judith Klimovsky</link:label>
    <link:label id="lab_gmab_JudithKlimovskyMember_label_en-US" xlink:label="lab_gmab_JudithKlimovskyMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Judith Klimovsky [Member]</link:label>
    <link:label id="lab_gmab_JudithKlimovskyMember_documentation_en-US" xlink:label="lab_gmab_JudithKlimovskyMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents information pertaining to Judith Klimovsky.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_JudithKlimovskyMember" xlink:href="gmab-20251231.xsd#gmab_JudithKlimovskyMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_JudithKlimovskyMember" xlink:to="lab_gmab_JudithKlimovskyMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_BusinessCombinationsAxis_6b7a6701-6fee-4c7c-a8b1-43c03367dee4_terseLabel_en-US" xlink:label="lab_ifrs-full_BusinessCombinationsAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Business combinations [axis]</link:label>
    <link:label id="lab_ifrs-full_BusinessCombinationsAxis_label_en-US" xlink:label="lab_ifrs-full_BusinessCombinationsAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Business combinations [axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BusinessCombinationsAxis" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BusinessCombinationsAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_BusinessCombinationsAxis" xlink:to="lab_ifrs-full_BusinessCombinationsAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_SeniorSecuredNotesMember_019b27cc-4af7-7b1c-bd69-c0542c435804_terseLabel_en-US" xlink:label="lab_gmab_SeniorSecuredNotesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Secured Notes</link:label>
    <link:label id="lab_gmab_SeniorSecuredNotesMember_label_en-US" xlink:label="lab_gmab_SeniorSecuredNotesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Senior Secured Notes [Member]</link:label>
    <link:label id="lab_gmab_SeniorSecuredNotesMember_documentation_en-US" xlink:label="lab_gmab_SeniorSecuredNotesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Senior Secured Notes</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_SeniorSecuredNotesMember" xlink:href="gmab-20251231.xsd#gmab_SeniorSecuredNotesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_SeniorSecuredNotesMember" xlink:to="lab_gmab_SeniorSecuredNotesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_BusinessCombinationsDomain_c4781c6b-1b89-425e-b32c-5b5dd64b9f77_terseLabel_en-US" xlink:label="lab_ifrs-full_BusinessCombinationsDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Business combinations [domain]</link:label>
    <link:label id="lab_ifrs-full_BusinessCombinationsDomain_label_en-US" xlink:label="lab_ifrs-full_BusinessCombinationsDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Business combinations [domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BusinessCombinationsDomain" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BusinessCombinationsDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_BusinessCombinationsDomain" xlink:to="lab_ifrs-full_BusinessCombinationsDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_CashTransferredForOutstandingEquityAwardsForSettlementOfVestedAwards_019c4c1f-6b8e-75d5-ba27-a3402a1d1b6d_verboseLabel_en-US" xlink:label="lab_gmab_CashTransferredForOutstandingEquityAwardsForSettlementOfVestedAwards" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Cash for equity compensation attributable to pre-modification of equity awards</link:label>
    <link:label id="lab_gmab_CashTransferredForOutstandingEquityAwardsForSettlementOfVestedAwards_4d063514-ff26-4212-9d2a-3755cb1e916f_terseLabel_en-US" xlink:label="lab_gmab_CashTransferredForOutstandingEquityAwardsForSettlementOfVestedAwards" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash for equity compensation attributable to pre-combination service</link:label>
    <link:label id="lab_gmab_CashTransferredForOutstandingEquityAwardsForSettlementOfVestedAwards_label_en-US" xlink:label="lab_gmab_CashTransferredForOutstandingEquityAwardsForSettlementOfVestedAwards" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash Transferred For Outstanding Equity Awards For Settlement Of Vested Awards</link:label>
    <link:label id="lab_gmab_CashTransferredForOutstandingEquityAwardsForSettlementOfVestedAwards_documentation_en-US" xlink:label="lab_gmab_CashTransferredForOutstandingEquityAwardsForSettlementOfVestedAwards" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The fair value, at acquisition date, of cash transferred for outstanding equity awards for settlement of vested awards where the vesting period was completed as consideration in a business combination.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_CashTransferredForOutstandingEquityAwardsForSettlementOfVestedAwards" xlink:href="gmab-20251231.xsd#gmab_CashTransferredForOutstandingEquityAwardsForSettlementOfVestedAwards"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_CashTransferredForOutstandingEquityAwardsForSettlementOfVestedAwards" xlink:to="lab_gmab_CashTransferredForOutstandingEquityAwardsForSettlementOfVestedAwards" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_InterestReceivable_5c6e82ee-b2d0-4a16-b3a6-f7b3a69f16d4_terseLabel_en-US" xlink:label="lab_ifrs-full_InterestReceivable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Interest receivables</link:label>
    <link:label id="lab_ifrs-full_InterestReceivable_label_en-US" xlink:label="lab_ifrs-full_InterestReceivable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Interest receivable</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InterestReceivable" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_InterestReceivable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_InterestReceivable" xlink:to="lab_ifrs-full_InterestReceivable" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_LongtermBorrowingsMember_019b31a0-04a7-7251-b20d-afff7a2751aa_terseLabel_en-US" xlink:label="lab_ifrs-full_LongtermBorrowingsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Borrowings</link:label>
    <link:label id="lab_ifrs-full_LongtermBorrowingsMember_label_en-US" xlink:label="lab_ifrs-full_LongtermBorrowingsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term borrowings [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LongtermBorrowingsMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LongtermBorrowingsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_LongtermBorrowingsMember" xlink:to="lab_ifrs-full_LongtermBorrowingsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_RemainingUsefulLifeMeasuredAsPeriodOfTimeIntangibleAssetsOtherThanGoodwill_019be507-6b6f-7944-8b37-7c542b1f3223_terseLabel_en-US" xlink:label="lab_gmab_RemainingUsefulLifeMeasuredAsPeriodOfTimeIntangibleAssetsOtherThanGoodwill" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Remaining useful life, projection (in years)</link:label>
    <link:label id="lab_gmab_RemainingUsefulLifeMeasuredAsPeriodOfTimeIntangibleAssetsOtherThanGoodwill_label_en-US" xlink:label="lab_gmab_RemainingUsefulLifeMeasuredAsPeriodOfTimeIntangibleAssetsOtherThanGoodwill" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Remaining Useful Life Measured As Period Of Time, Intangible Assets Other Than Goodwill</link:label>
    <link:label id="lab_gmab_RemainingUsefulLifeMeasuredAsPeriodOfTimeIntangibleAssetsOtherThanGoodwill_documentation_en-US" xlink:label="lab_gmab_RemainingUsefulLifeMeasuredAsPeriodOfTimeIntangibleAssetsOtherThanGoodwill" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Remaining Useful Life Measured As Period Of Time, Intangible Assets Other Than Goodwill</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_RemainingUsefulLifeMeasuredAsPeriodOfTimeIntangibleAssetsOtherThanGoodwill" xlink:href="gmab-20251231.xsd#gmab_RemainingUsefulLifeMeasuredAsPeriodOfTimeIntangibleAssetsOtherThanGoodwill"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_RemainingUsefulLifeMeasuredAsPeriodOfTimeIntangibleAssetsOtherThanGoodwill" xlink:to="lab_gmab_RemainingUsefulLifeMeasuredAsPeriodOfTimeIntangibleAssetsOtherThanGoodwill" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_WeightedAverageExercisePriceOfWarrantsOutstanding_284a3bf2-d468-4223-a986-eab07a5181d3_periodStartLabel_en-US" xlink:label="lab_gmab_WeightedAverageExercisePriceOfWarrantsOutstanding" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Weighted average exercise price of warrants at beginning (in DKK per share)</link:label>
    <link:label id="lab_gmab_WeightedAverageExercisePriceOfWarrantsOutstanding_1ce46d7d-63e4-4343-8d8c-5d5690138eaa_periodEndLabel_en-US" xlink:label="lab_gmab_WeightedAverageExercisePriceOfWarrantsOutstanding" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Weighted average exercise price of warrants at ending (in DKK per share)</link:label>
    <link:label id="lab_gmab_WeightedAverageExercisePriceOfWarrantsOutstanding_label_en-US" xlink:label="lab_gmab_WeightedAverageExercisePriceOfWarrantsOutstanding" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Weighted Average Exercise Price Of Warrants Outstanding</link:label>
    <link:label id="lab_gmab_WeightedAverageExercisePriceOfWarrantsOutstanding_documentation_en-US" xlink:label="lab_gmab_WeightedAverageExercisePriceOfWarrantsOutstanding" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Weighted average exercise price of warrants outstanding.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_WeightedAverageExercisePriceOfWarrantsOutstanding" xlink:href="gmab-20251231.xsd#gmab_WeightedAverageExercisePriceOfWarrantsOutstanding"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_WeightedAverageExercisePriceOfWarrantsOutstanding" xlink:to="lab_gmab_WeightedAverageExercisePriceOfWarrantsOutstanding" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_CityAreaCode_019b0cd1-9a80-751c-9478-afa25595e69c_terseLabel_en-US" xlink:label="lab_dei_CityAreaCode" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">City Area Code</link:label>
    <link:label id="lab_dei_CityAreaCode_label_en-US" xlink:label="lab_dei_CityAreaCode" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">City Area Code</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CityAreaCode"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_CityAreaCode" xlink:to="lab_dei_CityAreaCode" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_TaxBenefitArisingFromPreviouslyUnrecognizedDeferredTaxAssets_e7b7b340-1ac6-4603-a59d-90d6e89b1cfe_terseLabel_en-US" xlink:label="lab_gmab_TaxBenefitArisingFromPreviouslyUnrecognizedDeferredTaxAssets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unrecognized tax losses</link:label>
    <link:label id="lab_gmab_TaxBenefitArisingFromPreviouslyUnrecognizedDeferredTaxAssets_label_en-US" xlink:label="lab_gmab_TaxBenefitArisingFromPreviouslyUnrecognizedDeferredTaxAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Tax Benefit Arising From Previously Unrecognized Deferred Tax Assets</link:label>
    <link:label id="lab_gmab_TaxBenefitArisingFromPreviouslyUnrecognizedDeferredTaxAssets_documentation_en-US" xlink:label="lab_gmab_TaxBenefitArisingFromPreviouslyUnrecognizedDeferredTaxAssets" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The amount of benefit arising from a previously unrecognized deferred tax assets now recognized.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_TaxBenefitArisingFromPreviouslyUnrecognizedDeferredTaxAssets" xlink:href="gmab-20251231.xsd#gmab_TaxBenefitArisingFromPreviouslyUnrecognizedDeferredTaxAssets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_TaxBenefitArisingFromPreviouslyUnrecognizedDeferredTaxAssets" xlink:to="lab_gmab_TaxBenefitArisingFromPreviouslyUnrecognizedDeferredTaxAssets" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_GenmabHoldingB.v.Member_d0552ed1-abac-413e-8a51-7e6c651b8a5f_terseLabel_en-US" xlink:label="lab_gmab_GenmabHoldingB.v.Member" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Genmab Holding B.V.</link:label>
    <link:label id="lab_gmab_GenmabHoldingB.v.Member_label_en-US" xlink:label="lab_gmab_GenmabHoldingB.v.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Genmab Holding B.v. [Member]</link:label>
    <link:label id="lab_gmab_GenmabHoldingB.v.Member_documentation_en-US" xlink:label="lab_gmab_GenmabHoldingB.v.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This member stands for Genmab Holding B.V.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_GenmabHoldingB.v.Member" xlink:href="gmab-20251231.xsd#gmab_GenmabHoldingB.v.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_GenmabHoldingB.v.Member" xlink:to="lab_gmab_GenmabHoldingB.v.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_currency_USD_62821bcf-7be6-4427-936c-ad575570664c_terseLabel_en-US" xlink:label="lab_currency_USD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">USD</link:label>
    <link:label id="lab_currency_USD_label_en-US" xlink:label="lab_currency_USD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">United States of America, Dollars</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_currency_USD" xlink:href="https://xbrl.sec.gov/currency/2025/currency-2025.xsd#currency_USD"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_currency_USD" xlink:to="lab_currency_USD" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfFairValueOfFinancialInstrumentsExplanatory_019bbce1-09a0-769d-a808-6316b2e3e735_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfFairValueOfFinancialInstrumentsExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure of fair value of financial instruments</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfFairValueOfFinancialInstrumentsExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfFairValueOfFinancialInstrumentsExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of fair value of financial instruments [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFairValueOfFinancialInstrumentsExplanatory" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfFairValueOfFinancialInstrumentsExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfFairValueOfFinancialInstrumentsExplanatory" xlink:to="lab_ifrs-full_DisclosureOfFairValueOfFinancialInstrumentsExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_UsefulLifeMeasuredAsPeriodOfTimePropertyPlantAndEquipment_40af60e5-c67f-4194-929d-9e2d1b3e654a_terseLabel_en-US" xlink:label="lab_ifrs-full_UsefulLifeMeasuredAsPeriodOfTimePropertyPlantAndEquipment" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Expected useful lives of assets</link:label>
    <link:label id="lab_ifrs-full_UsefulLifeMeasuredAsPeriodOfTimePropertyPlantAndEquipment_label_en-US" xlink:label="lab_ifrs-full_UsefulLifeMeasuredAsPeriodOfTimePropertyPlantAndEquipment" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Useful life measured as period of time, property, plant and equipment</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_UsefulLifeMeasuredAsPeriodOfTimePropertyPlantAndEquipment" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_UsefulLifeMeasuredAsPeriodOfTimePropertyPlantAndEquipment"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_UsefulLifeMeasuredAsPeriodOfTimePropertyPlantAndEquipment" xlink:to="lab_ifrs-full_UsefulLifeMeasuredAsPeriodOfTimePropertyPlantAndEquipment" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CategoriesOfFinancialLiabilitiesDomain_1ed50351-9e56-494e-a8e4-021fd64ad219_terseLabel_en-US" xlink:label="lab_ifrs-full_CategoriesOfFinancialLiabilitiesDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Categories of financial liabilities [domain]</link:label>
    <link:label id="lab_ifrs-full_CategoriesOfFinancialLiabilitiesDomain_label_en-US" xlink:label="lab_ifrs-full_CategoriesOfFinancialLiabilitiesDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Categories of financial liabilities [domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialLiabilitiesDomain" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialLiabilitiesDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CategoriesOfFinancialLiabilitiesDomain" xlink:to="lab_ifrs-full_CategoriesOfFinancialLiabilitiesDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_WeightedAverageSharePriceWarrantsGranted_f4697b6c-5356-430f-9c32-6a2b6aef6fc2_terseLabel_en-US" xlink:label="lab_gmab_WeightedAverageSharePriceWarrantsGranted" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share price (in DKK per share)</link:label>
    <link:label id="lab_gmab_WeightedAverageSharePriceWarrantsGranted_label_en-US" xlink:label="lab_gmab_WeightedAverageSharePriceWarrantsGranted" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Weighted Average Share Price, Warrants Granted</link:label>
    <link:label id="lab_gmab_WeightedAverageSharePriceWarrantsGranted_documentation_en-US" xlink:label="lab_gmab_WeightedAverageSharePriceWarrantsGranted" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The weighted average price used as input to the option pricing model to calculate the fair value of warrants granted.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_WeightedAverageSharePriceWarrantsGranted" xlink:href="gmab-20251231.xsd#gmab_WeightedAverageSharePriceWarrantsGranted"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_WeightedAverageSharePriceWarrantsGranted" xlink:to="lab_gmab_WeightedAverageSharePriceWarrantsGranted" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_LaterThanFiveYearsMember_2c84f0a6-6b37-45c3-a54c-569c335e0531_terseLabel_en-US" xlink:label="lab_ifrs-full_LaterThanFiveYearsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">More than 5 years</link:label>
    <link:label id="lab_ifrs-full_LaterThanFiveYearsMember_fd91433a-d30f-4366-adcf-722f069b34bf_verboseLabel_en-US" xlink:label="lab_ifrs-full_LaterThanFiveYearsMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">2030+</link:label>
    <link:label id="lab_ifrs-full_LaterThanFiveYearsMember_label_en-US" xlink:label="lab_ifrs-full_LaterThanFiveYearsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Later than five years [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LaterThanFiveYearsMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LaterThanFiveYearsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_LaterThanFiveYearsMember" xlink:to="lab_ifrs-full_LaterThanFiveYearsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_OtherCollaborationPartnersMember_7795106b-102d-4b93-a5f8-bf9534883534_terseLabel_en-US" xlink:label="lab_gmab_OtherCollaborationPartnersMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other</link:label>
    <link:label id="lab_gmab_OtherCollaborationPartnersMember_label_en-US" xlink:label="lab_gmab_OtherCollaborationPartnersMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Collaboration Partners [Member]</link:label>
    <link:label id="lab_gmab_OtherCollaborationPartnersMember_documentation_en-US" xlink:label="lab_gmab_OtherCollaborationPartnersMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This member stands for collaborative arrangement with other collaboration partners.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_OtherCollaborationPartnersMember" xlink:href="gmab-20251231.xsd#gmab_OtherCollaborationPartnersMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_OtherCollaborationPartnersMember" xlink:to="lab_gmab_OtherCollaborationPartnersMember" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_KeyManagementPersonnelCompensationOtherBenefits_a20661f0-4677-444c-9975-a828a72dc49d_terseLabel_en-US" xlink:label="lab_gmab_KeyManagementPersonnelCompensationOtherBenefits" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other Benefits</link:label>
    <link:label id="lab_gmab_KeyManagementPersonnelCompensationOtherBenefits_label_en-US" xlink:label="lab_gmab_KeyManagementPersonnelCompensationOtherBenefits" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Key Management Personnel Compensation, Other Benefits</link:label>
    <link:label id="lab_gmab_KeyManagementPersonnelCompensationOtherBenefits_documentation_en-US" xlink:label="lab_gmab_KeyManagementPersonnelCompensationOtherBenefits" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The amount of compensation to key management personnel in the form of other benefits.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_KeyManagementPersonnelCompensationOtherBenefits" xlink:href="gmab-20251231.xsd#gmab_KeyManagementPersonnelCompensationOtherBenefits"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_KeyManagementPersonnelCompensationOtherBenefits" xlink:to="lab_gmab_KeyManagementPersonnelCompensationOtherBenefits" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_NewRoyaltyObligationTermFromTheDateOfFirstCommercialSaleOfProduct_1b1c80f7-be6d-4569-b222-100e66c04eaf_terseLabel_en-US" xlink:label="lab_gmab_NewRoyaltyObligationTermFromTheDateOfFirstCommercialSaleOfProduct" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">New royalty term entitled as mentioned in declaration</link:label>
    <link:label id="lab_gmab_NewRoyaltyObligationTermFromTheDateOfFirstCommercialSaleOfProduct_label_en-US" xlink:label="lab_gmab_NewRoyaltyObligationTermFromTheDateOfFirstCommercialSaleOfProduct" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">New Royalty Obligation Term, From The Date of First Commercial Sale of Product</link:label>
    <link:label id="lab_gmab_NewRoyaltyObligationTermFromTheDateOfFirstCommercialSaleOfProduct_documentation_en-US" xlink:label="lab_gmab_NewRoyaltyObligationTermFromTheDateOfFirstCommercialSaleOfProduct" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the new royalty term entitled from the date of DARZALEX FASPRO's first commercial sale as mentioned in declaration in second arbitration.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_NewRoyaltyObligationTermFromTheDateOfFirstCommercialSaleOfProduct" xlink:href="gmab-20251231.xsd#gmab_NewRoyaltyObligationTermFromTheDateOfFirstCommercialSaleOfProduct"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_NewRoyaltyObligationTermFromTheDateOfFirstCommercialSaleOfProduct" xlink:to="lab_gmab_NewRoyaltyObligationTermFromTheDateOfFirstCommercialSaleOfProduct" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ClassesOfFinancialAssetsDomain_a9c8bf8c-1e17-4d4f-a0b6-5eba143b9247_terseLabel_en-US" xlink:label="lab_ifrs-full_ClassesOfFinancialAssetsDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Classes of financial assets [domain]</link:label>
    <link:label id="lab_ifrs-full_ClassesOfFinancialAssetsDomain_label_en-US" xlink:label="lab_ifrs-full_ClassesOfFinancialAssetsDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Classes of financial assets [domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialAssetsDomain" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialAssetsDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain" xlink:to="lab_ifrs-full_ClassesOfFinancialAssetsDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_BasisOfPresentationAbstract_c72d1bfe-9d61-4ff8-baee-718cb8090ed0_terseLabel_en-US" xlink:label="lab_gmab_BasisOfPresentationAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Basis of Presentation [Abstract]</link:label>
    <link:label id="lab_gmab_BasisOfPresentationAbstract_label_en-US" xlink:label="lab_gmab_BasisOfPresentationAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Basis of Presentation [Abstract]</link:label>
    <link:label id="lab_gmab_BasisOfPresentationAbstract_documentation_en-US" xlink:label="lab_gmab_BasisOfPresentationAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">No definition available.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_BasisOfPresentationAbstract" xlink:href="gmab-20251231.xsd#gmab_BasisOfPresentationAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_BasisOfPresentationAbstract" xlink:to="lab_gmab_BasisOfPresentationAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ImpairmentLossRecognisedInProfitOrLossIntangibleAssetsAndGoodwill_155503d2-de22-4c47-8d80-73c51d1c7718_terseLabel_en-US" xlink:label="lab_ifrs-full_ImpairmentLossRecognisedInProfitOrLossIntangibleAssetsAndGoodwill" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Impairment losses for the year</link:label>
    <link:label id="lab_ifrs-full_ImpairmentLossRecognisedInProfitOrLossIntangibleAssetsAndGoodwill_label_en-US" xlink:label="lab_ifrs-full_ImpairmentLossRecognisedInProfitOrLossIntangibleAssetsAndGoodwill" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Impairment loss recognised in profit or loss, intangible assets and goodwill</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ImpairmentLossRecognisedInProfitOrLossIntangibleAssetsAndGoodwill" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ImpairmentLossRecognisedInProfitOrLossIntangibleAssetsAndGoodwill"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ImpairmentLossRecognisedInProfitOrLossIntangibleAssetsAndGoodwill" xlink:to="lab_ifrs-full_ImpairmentLossRecognisedInProfitOrLossIntangibleAssetsAndGoodwill" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_Level3OfFairValueHierarchyMember_168317b6-54c9-495a-ae48-114e22662e74_verboseLabel_en-US" xlink:label="lab_ifrs-full_Level3OfFairValueHierarchyMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Level 3</link:label>
    <link:label id="lab_ifrs-full_Level3OfFairValueHierarchyMember_019b2c46-880c-7e40-ae7f-6287bb73c2c1_terseLabel_en-US" xlink:label="lab_ifrs-full_Level3OfFairValueHierarchyMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Level 3 of fair value hierarchy [member]</link:label>
    <link:label id="lab_ifrs-full_Level3OfFairValueHierarchyMember_label_en-US" xlink:label="lab_ifrs-full_Level3OfFairValueHierarchyMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Level 3 of fair value hierarchy [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Level3OfFairValueHierarchyMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Level3OfFairValueHierarchyMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_Level3OfFairValueHierarchyMember" xlink:to="lab_ifrs-full_Level3OfFairValueHierarchyMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillTable_c628339e-9bf8-4419-b58f-8be2cc8a08e0_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure of reconciliation of changes in intangible assets and goodwill [table]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillTable_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of reconciliation of changes in intangible assets and goodwill [table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillTable" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillTable" xlink:to="lab_ifrs-full_DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillTable" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfAccountingJudgementsAndEstimatesExplanatory_019bbbd6-90bd-73c7-a1ae-cc7d4fa30d9f_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfAccountingJudgementsAndEstimatesExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Management's Judgements and Estimates under IFRS</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfAccountingJudgementsAndEstimatesExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfAccountingJudgementsAndEstimatesExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of accounting judgements and estimates [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfAccountingJudgementsAndEstimatesExplanatory" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfAccountingJudgementsAndEstimatesExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfAccountingJudgementsAndEstimatesExplanatory" xlink:to="lab_ifrs-full_DisclosureOfAccountingJudgementsAndEstimatesExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_CashFlowFromUsedInOperatingActivitiesBeforeFinancialItems_2a5d1563-b1c5-4c78-9b01-36c2f816c37c_totalLabel_en-US" xlink:label="lab_gmab_CashFlowFromUsedInOperatingActivitiesBeforeFinancialItems" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Cash flows from operating activities before financial items</link:label>
    <link:label id="lab_gmab_CashFlowFromUsedInOperatingActivitiesBeforeFinancialItems_label_en-US" xlink:label="lab_gmab_CashFlowFromUsedInOperatingActivitiesBeforeFinancialItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash Flow From (Used In) Operating Activities Before Financial Items</link:label>
    <link:label id="lab_gmab_CashFlowFromUsedInOperatingActivitiesBeforeFinancialItems_documentation_en-US" xlink:label="lab_gmab_CashFlowFromUsedInOperatingActivitiesBeforeFinancialItems" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The cash flows from (used in) operating activities, which are the principal revenue-producing activities of the entity and other activities before reconciling the financial items.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_CashFlowFromUsedInOperatingActivitiesBeforeFinancialItems" xlink:href="gmab-20251231.xsd#gmab_CashFlowFromUsedInOperatingActivitiesBeforeFinancialItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_CashFlowFromUsedInOperatingActivitiesBeforeFinancialItems" xlink:to="lab_gmab_CashFlowFromUsedInOperatingActivitiesBeforeFinancialItems" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_GoodwillRecognisedAsOfAcquisitionDate_921e33c4-322b-43ae-aeb0-fde85e99bb53_terseLabel_en-US" xlink:label="lab_ifrs-full_GoodwillRecognisedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Goodwill</link:label>
    <link:label id="lab_ifrs-full_GoodwillRecognisedAsOfAcquisitionDate_label_en-US" xlink:label="lab_ifrs-full_GoodwillRecognisedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Goodwill recognised as of acquisition date</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GoodwillRecognisedAsOfAcquisitionDate" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GoodwillRecognisedAsOfAcquisitionDate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_GoodwillRecognisedAsOfAcquisitionDate" xlink:to="lab_ifrs-full_GoodwillRecognisedAsOfAcquisitionDate" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_CorporateTaxReceivable_906e61d5-f93f-4d29-a42f-4b411281c28c_terseLabel_en-US" xlink:label="lab_gmab_CorporateTaxReceivable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Corporate tax receivable</link:label>
    <link:label id="lab_gmab_CorporateTaxReceivable_label_en-US" xlink:label="lab_gmab_CorporateTaxReceivable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Corporate Tax Receivable</link:label>
    <link:label id="lab_gmab_CorporateTaxReceivable_documentation_en-US" xlink:label="lab_gmab_CorporateTaxReceivable" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Corporate Tax Receivable</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_CorporateTaxReceivable" xlink:href="gmab-20251231.xsd#gmab_CorporateTaxReceivable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_CorporateTaxReceivable" xlink:to="lab_gmab_CorporateTaxReceivable" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfClassesOfShareCapitalTable_f9bf13a3-d863-4e01-8e2d-552c8b35af28_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfClassesOfShareCapitalTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure of classes of share capital [table]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfClassesOfShareCapitalTable_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfClassesOfShareCapitalTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of classes of share capital [table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfClassesOfShareCapitalTable" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfClassesOfShareCapitalTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalTable" xlink:to="lab_ifrs-full_DisclosureOfClassesOfShareCapitalTable" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_AuditorName_2d1a5807-d4ca-4e30-90a9-38314a7c2e13_terseLabel_en-US" xlink:label="lab_dei_AuditorName" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Auditor Name</link:label>
    <link:label id="lab_dei_AuditorName_label_en-US" xlink:label="lab_dei_AuditorName" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Auditor Name</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AuditorName" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AuditorName"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_AuditorName" xlink:to="lab_dei_AuditorName" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_IncreaseDecreaseInGainLossOfMarketableSecurities_871840b3-9eee-4965-98b9-7ef2a840c639_terseLabel_en-US" xlink:label="lab_gmab_IncreaseDecreaseInGainLossOfMarketableSecurities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Increase (decrease) in gain (loss) of marketable securities</link:label>
    <link:label id="lab_gmab_IncreaseDecreaseInGainLossOfMarketableSecurities_label_en-US" xlink:label="lab_gmab_IncreaseDecreaseInGainLossOfMarketableSecurities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) In Gain (Loss) Of Marketable Securities</link:label>
    <link:label id="lab_gmab_IncreaseDecreaseInGainLossOfMarketableSecurities_documentation_en-US" xlink:label="lab_gmab_IncreaseDecreaseInGainLossOfMarketableSecurities" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Amount of decrease in gain of marketable securities compared to prior period.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_IncreaseDecreaseInGainLossOfMarketableSecurities" xlink:href="gmab-20251231.xsd#gmab_IncreaseDecreaseInGainLossOfMarketableSecurities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_IncreaseDecreaseInGainLossOfMarketableSecurities" xlink:to="lab_gmab_IncreaseDecreaseInGainLossOfMarketableSecurities" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_AssetAcquisition.Domain_019c5612-1396-7918-864b-f92330ae0a7b_terseLabel_en-US" xlink:label="lab_gmab_AssetAcquisition.Domain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Asset Acquisition [Domain]</link:label>
    <link:label id="lab_gmab_AssetAcquisition.Domain_label_en-US" xlink:label="lab_gmab_AssetAcquisition.Domain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Asset Acquisition. [Domain]</link:label>
    <link:label id="lab_gmab_AssetAcquisition.Domain_documentation_en-US" xlink:label="lab_gmab_AssetAcquisition.Domain" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Asset Acquisition.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_AssetAcquisition.Domain" xlink:href="gmab-20251231.xsd#gmab_AssetAcquisition.Domain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_AssetAcquisition.Domain" xlink:to="lab_gmab_AssetAcquisition.Domain" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_BusinessCombinationNumberOfCandidatesInClinicalDevelopmentRightsReceived_c7a6c6f1-25d2-48b5-833c-2fdd8bb13137_terseLabel_en-US" xlink:label="lab_gmab_BusinessCombinationNumberOfCandidatesInClinicalDevelopmentRightsReceived" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of candidates</link:label>
    <link:label id="lab_gmab_BusinessCombinationNumberOfCandidatesInClinicalDevelopmentRightsReceived_label_en-US" xlink:label="lab_gmab_BusinessCombinationNumberOfCandidatesInClinicalDevelopmentRightsReceived" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Business Combination, Number of Candidates in Clinical Development, Rights Received</link:label>
    <link:label id="lab_gmab_BusinessCombinationNumberOfCandidatesInClinicalDevelopmentRightsReceived_documentation_en-US" xlink:label="lab_gmab_BusinessCombinationNumberOfCandidatesInClinicalDevelopmentRightsReceived" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the number of candidates in clinical development for which received the rights.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_BusinessCombinationNumberOfCandidatesInClinicalDevelopmentRightsReceived" xlink:href="gmab-20251231.xsd#gmab_BusinessCombinationNumberOfCandidatesInClinicalDevelopmentRightsReceived"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_BusinessCombinationNumberOfCandidatesInClinicalDevelopmentRightsReceived" xlink:to="lab_gmab_BusinessCombinationNumberOfCandidatesInClinicalDevelopmentRightsReceived" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_ShareholdingsByBoardOfDirectorsAndExecutiveManagementTable_f3ea2b44-bcfa-497c-89ab-9a969d129328_terseLabel_en-US" xlink:label="lab_gmab_ShareholdingsByBoardOfDirectorsAndExecutiveManagementTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Shareholdings By The Board Of Directors And Executive Management [Table]</link:label>
    <link:label id="lab_gmab_ShareholdingsByBoardOfDirectorsAndExecutiveManagementTable_label_en-US" xlink:label="lab_gmab_ShareholdingsByBoardOfDirectorsAndExecutiveManagementTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Shareholdings By The Board Of Directors And Executive Management [Table]</link:label>
    <link:label id="lab_gmab_ShareholdingsByBoardOfDirectorsAndExecutiveManagementTable_documentation_en-US" xlink:label="lab_gmab_ShareholdingsByBoardOfDirectorsAndExecutiveManagementTable" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Schedule disclosing information relating to shareholdings by the board of directors and executive management.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_ShareholdingsByBoardOfDirectorsAndExecutiveManagementTable" xlink:href="gmab-20251231.xsd#gmab_ShareholdingsByBoardOfDirectorsAndExecutiveManagementTable"/>
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    <link:label id="lab_ifrs-full_DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersLineItems_78f08513-b94c-42a9-9fa2-cf7d92caada3_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure of disaggregation of revenue from contracts with customers [line items]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersLineItems_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of disaggregation of revenue from contracts with customers [line items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersLineItems" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersLineItems"/>
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    <link:label id="lab_ifrs-full_DisclosureOfTradeAndOtherReceivablesExplanatory_b266a3d2-ccd0-4432-8977-f7b2eb9c895d_verboseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfTradeAndOtherReceivablesExplanatory" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Schedules of receivables</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfTradeAndOtherReceivablesExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfTradeAndOtherReceivablesExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of trade and other receivables [text block]</link:label>
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    <link:label id="lab_ifrs-full_GoodwillMember_6220dd5d-0860-4a7c-9c14-cc998d11299e_terseLabel_en-US" xlink:label="lab_ifrs-full_GoodwillMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Goodwill</link:label>
    <link:label id="lab_ifrs-full_GoodwillMember_label_en-US" xlink:label="lab_ifrs-full_GoodwillMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Goodwill [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GoodwillMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GoodwillMember"/>
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    <link:label id="lab_gmab_DeferredTaxAssetsIncludingIntangibleAssets_9ca692cf-654f-4e62-a902-1f0449e8920d_terseLabel_en-US" xlink:label="lab_gmab_DeferredTaxAssetsIncludingIntangibleAssets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Deferred tax assets including intangible assets</link:label>
    <link:label id="lab_gmab_DeferredTaxAssetsIncludingIntangibleAssets_label_en-US" xlink:label="lab_gmab_DeferredTaxAssetsIncludingIntangibleAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deferred Tax Assets Including Intangible Assets</link:label>
    <link:label id="lab_gmab_DeferredTaxAssetsIncludingIntangibleAssets_documentation_en-US" xlink:label="lab_gmab_DeferredTaxAssetsIncludingIntangibleAssets" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Deferred Tax Assets Including Intangible Assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_DeferredTaxAssetsIncludingIntangibleAssets" xlink:href="gmab-20251231.xsd#gmab_DeferredTaxAssetsIncludingIntangibleAssets"/>
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    <link:label id="lab_gmab_TransactionPricePerShare_019b26bc-a05d-7236-82d9-0b00f87dc290_terseLabel_en-US" xlink:label="lab_gmab_TransactionPricePerShare" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Transaction price (in dollars per share)</link:label>
    <link:label id="lab_gmab_TransactionPricePerShare_label_en-US" xlink:label="lab_gmab_TransactionPricePerShare" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Transaction Price Per Share</link:label>
    <link:label id="lab_gmab_TransactionPricePerShare_documentation_en-US" xlink:label="lab_gmab_TransactionPricePerShare" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Transaction Price Per Share</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_TransactionPricePerShare" xlink:href="gmab-20251231.xsd#gmab_TransactionPricePerShare"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_TransactionPricePerShare" xlink:to="lab_gmab_TransactionPricePerShare" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_PercentageOfMarketableSecurities_974efda5-6d44-4e7b-888c-292e363094f4_terseLabel_en-US" xlink:label="lab_gmab_PercentageOfMarketableSecurities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Percentage of marketable securities</link:label>
    <link:label id="lab_gmab_PercentageOfMarketableSecurities_label_en-US" xlink:label="lab_gmab_PercentageOfMarketableSecurities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Percentage Of Marketable Securities</link:label>
    <link:label id="lab_gmab_PercentageOfMarketableSecurities_documentation_en-US" xlink:label="lab_gmab_PercentageOfMarketableSecurities" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The percentage of marketable securities.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_PercentageOfMarketableSecurities" xlink:href="gmab-20251231.xsd#gmab_PercentageOfMarketableSecurities"/>
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    <link:label id="lab_gmab_ReceivableAmountRelatedToClinicalDevelopmentAndCommercialSuccess_7eb7f072-2d09-4fea-bf5b-9ac611fb5748_terseLabel_en-US" xlink:label="lab_gmab_ReceivableAmountRelatedToClinicalDevelopmentAndCommercialSuccess" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Contractually entitled to receive payments related to clinical development and commercial success</link:label>
    <link:label id="lab_gmab_ReceivableAmountRelatedToClinicalDevelopmentAndCommercialSuccess_label_en-US" xlink:label="lab_gmab_ReceivableAmountRelatedToClinicalDevelopmentAndCommercialSuccess" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Receivable Amount Related to Clinical Development and Commercial Success</link:label>
    <link:label id="lab_gmab_ReceivableAmountRelatedToClinicalDevelopmentAndCommercialSuccess_documentation_en-US" xlink:label="lab_gmab_ReceivableAmountRelatedToClinicalDevelopmentAndCommercialSuccess" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the contractually entitled to receive payments related to clinical development and commercial success.</link:label>
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    <link:label id="lab_gmab_RatioOfShareOfProfitsBeforeIncomeTaxes_7cae48ba-5d5f-4f0e-be59-1e385ef23a5e_terseLabel_en-US" xlink:label="lab_gmab_RatioOfShareOfProfitsBeforeIncomeTaxes" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Ratio of share of profits before income taxes</link:label>
    <link:label id="lab_gmab_RatioOfShareOfProfitsBeforeIncomeTaxes_label_en-US" xlink:label="lab_gmab_RatioOfShareOfProfitsBeforeIncomeTaxes" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Ratio of Share of Profits before Income Taxes</link:label>
    <link:label id="lab_gmab_RatioOfShareOfProfitsBeforeIncomeTaxes_documentation_en-US" xlink:label="lab_gmab_RatioOfShareOfProfitsBeforeIncomeTaxes" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The ratio of share of profits before income taxes.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_RatioOfShareOfProfitsBeforeIncomeTaxes" xlink:href="gmab-20251231.xsd#gmab_RatioOfShareOfProfitsBeforeIncomeTaxes"/>
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    <link:label id="lab_ifrs-full_CashFlowsFromUsedInOperatingActivities_70d722be-6a9d-4c1a-887a-456822411718_totalLabel_en-US" xlink:label="lab_ifrs-full_CashFlowsFromUsedInOperatingActivities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net cash provided by operating activities</link:label>
    <link:label id="lab_ifrs-full_CashFlowsFromUsedInOperatingActivities_019bbbb5-eabd-7d52-a85e-c1a8c9165e78_verboseLabel_en-US" xlink:label="lab_ifrs-full_CashFlowsFromUsedInOperatingActivities" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Operating activities</link:label>
    <link:label id="lab_ifrs-full_CashFlowsFromUsedInOperatingActivities_label_en-US" xlink:label="lab_ifrs-full_CashFlowsFromUsedInOperatingActivities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash flows from (used in) operating activities</link:label>
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    <link:label id="lab_ifrs-full_FinishedGoods_2d1a5148-8ad2-4d29-9a91-b44aa27999d9_verboseLabel_en-US" xlink:label="lab_ifrs-full_FinishedGoods" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Finished goods</link:label>
    <link:label id="lab_ifrs-full_FinishedGoods_label_en-US" xlink:label="lab_ifrs-full_FinishedGoods" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Current finished goods</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinishedGoods" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinishedGoods"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_FinishedGoods" xlink:to="lab_ifrs-full_FinishedGoods" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_WeightedAverageFairValueOfOtherEquityInstrumentsGrantedInShareBasedPaymentArrangement_ad86426d-961d-44bf-839a-5247ce69433e_terseLabel_en-US" xlink:label="lab_gmab_WeightedAverageFairValueOfOtherEquityInstrumentsGrantedInShareBasedPaymentArrangement" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Weighted average fair value per RSU granted (in DKK per share)</link:label>
    <link:label id="lab_gmab_WeightedAverageFairValueOfOtherEquityInstrumentsGrantedInShareBasedPaymentArrangement_label_en-US" xlink:label="lab_gmab_WeightedAverageFairValueOfOtherEquityInstrumentsGrantedInShareBasedPaymentArrangement" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Weighted Average Fair Value Of Other Equity Instruments Granted In Share Based Payment Arrangement</link:label>
    <link:label id="lab_gmab_WeightedAverageFairValueOfOtherEquityInstrumentsGrantedInShareBasedPaymentArrangement_documentation_en-US" xlink:label="lab_gmab_WeightedAverageFairValueOfOtherEquityInstrumentsGrantedInShareBasedPaymentArrangement" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The weighted average fair value of other equity instruments (i.e. other than share options) granted in a share-based payment arrangement.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_WeightedAverageFairValueOfOtherEquityInstrumentsGrantedInShareBasedPaymentArrangement" xlink:href="gmab-20251231.xsd#gmab_WeightedAverageFairValueOfOtherEquityInstrumentsGrantedInShareBasedPaymentArrangement"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_WeightedAverageFairValueOfOtherEquityInstrumentsGrantedInShareBasedPaymentArrangement" xlink:to="lab_gmab_WeightedAverageFairValueOfOtherEquityInstrumentsGrantedInShareBasedPaymentArrangement" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_NumberOfOtherEquityInstrumentsForfeitedInSharebasedPaymentArrangement_e665f8c7-e979-40dc-ac1d-d87f3e87bfd5_negatedLabel_en-US" xlink:label="lab_ifrs-full_NumberOfOtherEquityInstrumentsForfeitedInSharebasedPaymentArrangement" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Forfeited (in shares)</link:label>
    <link:label id="lab_ifrs-full_NumberOfOtherEquityInstrumentsForfeitedInSharebasedPaymentArrangement_label_en-US" xlink:label="lab_ifrs-full_NumberOfOtherEquityInstrumentsForfeitedInSharebasedPaymentArrangement" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number of other equity instruments forfeited in share-based payment arrangement</link:label>
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    <link:label id="lab_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_aad5758b-2fba-47b4-934b-e58954d69683_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure of terms and conditions of share-based payment arrangement [line items]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of terms and conditions of share-based payment arrangement [line items]</link:label>
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    <link:label id="lab_gmab_CollaborationAgreementsLiabilities_3be881c3-9126-4e69-9f86-3272d66410fa_terseLabel_en-US" xlink:label="lab_gmab_CollaborationAgreementsLiabilities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Liabilities related to collaboration agreements</link:label>
    <link:label id="lab_gmab_CollaborationAgreementsLiabilities_label_en-US" xlink:label="lab_gmab_CollaborationAgreementsLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Collaboration Agreements, Liabilities</link:label>
    <link:label id="lab_gmab_CollaborationAgreementsLiabilities_documentation_en-US" xlink:label="lab_gmab_CollaborationAgreementsLiabilities" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The amount of liabilities under collaboration agreement.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_CollaborationAgreementsLiabilities" xlink:href="gmab-20251231.xsd#gmab_CollaborationAgreementsLiabilities"/>
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    <link:label id="lab_dei_EntityDomain_eaebd646-d7dd-44f9-8e93-e7b4f5050937_terseLabel_en-US" xlink:label="lab_dei_EntityDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity [Domain]</link:label>
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    <link:label id="lab_gmab_AverageNumberOfTreasurySharesOutstanding_019c67f0-752c-7f0e-8d51-8bcd9c500b9b_negatedLabel_en-US" xlink:label="lab_gmab_AverageNumberOfTreasurySharesOutstanding" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Weighted average number of treasury shares (in shares)</link:label>
    <link:label id="lab_gmab_AverageNumberOfTreasurySharesOutstanding_label_en-US" xlink:label="lab_gmab_AverageNumberOfTreasurySharesOutstanding" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Average Number Of Treasury Shares Outstanding</link:label>
    <link:label id="lab_gmab_AverageNumberOfTreasurySharesOutstanding_documentation_en-US" xlink:label="lab_gmab_AverageNumberOfTreasurySharesOutstanding" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The number of treasury shares outstanding.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_AverageNumberOfTreasurySharesOutstanding" xlink:href="gmab-20251231.xsd#gmab_AverageNumberOfTreasurySharesOutstanding"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_AverageNumberOfTreasurySharesOutstanding" xlink:to="lab_gmab_AverageNumberOfTreasurySharesOutstanding" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_DocumentFiscalYearFocus_9f061f4a-7b00-4491-a0d4-d3594836a485_terseLabel_en-US" xlink:label="lab_dei_DocumentFiscalYearFocus" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Document Fiscal Year Focus</link:label>
    <link:label id="lab_dei_DocumentFiscalYearFocus_label_en-US" xlink:label="lab_dei_DocumentFiscalYearFocus" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Document Fiscal Year Focus</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalYearFocus" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentFiscalYearFocus"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_DocumentFiscalYearFocus" xlink:to="lab_dei_DocumentFiscalYearFocus" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_JanssenMember_c32f96aa-7c4a-4d50-b8f2-f3ba74672127_terseLabel_en-US" xlink:label="lab_gmab_JanssenMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Janssen</link:label>
    <link:label id="lab_gmab_JanssenMember_label_en-US" xlink:label="lab_gmab_JanssenMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Janssen [Member]</link:label>
    <link:label id="lab_gmab_JanssenMember_documentation_en-US" xlink:label="lab_gmab_JanssenMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This member stands for collaborative arrangement with Janssen (Darzalex/Daratumumab &amp; DuoBody).</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_JanssenMember" xlink:href="gmab-20251231.xsd#gmab_JanssenMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_JanssenMember" xlink:to="lab_gmab_JanssenMember" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_DecreaseIncreaseThoughTaxOnItemsRecognizedDirectlyInEquity_019bbba0-76ba-75b8-8bfa-052de148cbcd_negatedTerseLabel_en-US" xlink:label="lab_gmab_DecreaseIncreaseThoughTaxOnItemsRecognizedDirectlyInEquity" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Tax on items recognized directly in equity</link:label>
    <link:label id="lab_gmab_DecreaseIncreaseThoughTaxOnItemsRecognizedDirectlyInEquity_label_en-US" xlink:label="lab_gmab_DecreaseIncreaseThoughTaxOnItemsRecognizedDirectlyInEquity" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Decrease (Increase) Though Tax On Items Recognized Directly In Equity</link:label>
    <link:label id="lab_gmab_DecreaseIncreaseThoughTaxOnItemsRecognizedDirectlyInEquity_documentation_en-US" xlink:label="lab_gmab_DecreaseIncreaseThoughTaxOnItemsRecognizedDirectlyInEquity" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Decrease (Increase) Though Tax On Items Recognized Directly In Equity</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_DecreaseIncreaseThoughTaxOnItemsRecognizedDirectlyInEquity" xlink:href="gmab-20251231.xsd#gmab_DecreaseIncreaseThoughTaxOnItemsRecognizedDirectlyInEquity"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_DecreaseIncreaseThoughTaxOnItemsRecognizedDirectlyInEquity" xlink:to="lab_gmab_DecreaseIncreaseThoughTaxOnItemsRecognizedDirectlyInEquity" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AdjustmentsForReconcileProfitLossAbstract_26eb28e2-1698-411e-9580-5f58d4261799_verboseLabel_en-US" xlink:label="lab_ifrs-full_AdjustmentsForReconcileProfitLossAbstract" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Adjustment for non-cash transactions</link:label>
    <link:label id="lab_ifrs-full_AdjustmentsForReconcileProfitLossAbstract_label_en-US" xlink:label="lab_ifrs-full_AdjustmentsForReconcileProfitLossAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Adjustments to reconcile profit (loss) [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForReconcileProfitLossAbstract" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AdjustmentsForReconcileProfitLossAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AdjustmentsForReconcileProfitLossAbstract" xlink:to="lab_ifrs-full_AdjustmentsForReconcileProfitLossAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_NumberOfPeriodTerminationSeverancePayment_be898566-61cd-49ea-9a25-d83884a23016_terseLabel_en-US" xlink:label="lab_gmab_NumberOfPeriodTerminationSeverancePayment" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of period, termination severance payment</link:label>
    <link:label id="lab_gmab_NumberOfPeriodTerminationSeverancePayment_label_en-US" xlink:label="lab_gmab_NumberOfPeriodTerminationSeverancePayment" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number of Period, Termination Severance Payment</link:label>
    <link:label id="lab_gmab_NumberOfPeriodTerminationSeverancePayment_documentation_en-US" xlink:label="lab_gmab_NumberOfPeriodTerminationSeverancePayment" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The period for which the termination severance pay the entity obliged to pay in the event of termination.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_NumberOfPeriodTerminationSeverancePayment" xlink:href="gmab-20251231.xsd#gmab_NumberOfPeriodTerminationSeverancePayment"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_NumberOfPeriodTerminationSeverancePayment" xlink:to="lab_gmab_NumberOfPeriodTerminationSeverancePayment" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_ReconciliationOfContractLiabilitiesRollForward_019bb313-7667-7701-909d-117c8f02ee45_terseLabel_en-US" xlink:label="lab_gmab_ReconciliationOfContractLiabilitiesRollForward" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Reconciliation of Contract Liabilities [Roll Forward]</link:label>
    <link:label id="lab_gmab_ReconciliationOfContractLiabilitiesRollForward_label_en-US" xlink:label="lab_gmab_ReconciliationOfContractLiabilitiesRollForward" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Reconciliation of Contract Liabilities [Roll Forward]</link:label>
    <link:label id="lab_gmab_ReconciliationOfContractLiabilitiesRollForward_documentation_en-US" xlink:label="lab_gmab_ReconciliationOfContractLiabilitiesRollForward" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Reconciliation of Contract Liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_ReconciliationOfContractLiabilitiesRollForward" xlink:href="gmab-20251231.xsd#gmab_ReconciliationOfContractLiabilitiesRollForward"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_ReconciliationOfContractLiabilitiesRollForward" xlink:to="lab_gmab_ReconciliationOfContractLiabilitiesRollForward" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_ProfoundbioMember_45f95ec4-477e-4ac5-8e61-595f4ea8df23_terseLabel_en-US" xlink:label="lab_gmab_ProfoundbioMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">ProfoundBio</link:label>
    <link:label id="lab_gmab_ProfoundbioMember_label_en-US" xlink:label="lab_gmab_ProfoundbioMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">ProfoundBio [Member]</link:label>
    <link:label id="lab_gmab_ProfoundbioMember_documentation_en-US" xlink:label="lab_gmab_ProfoundbioMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This member stands for ProfoundBio.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_ProfoundbioMember" xlink:href="gmab-20251231.xsd#gmab_ProfoundbioMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_ProfoundbioMember" xlink:to="lab_gmab_ProfoundbioMember" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_BradBaileyMember_2d55e75c-6b6a-4801-863c-9b5ccad5218d_terseLabel_en-US" xlink:label="lab_gmab_BradBaileyMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Brad Bailey</link:label>
    <link:label id="lab_gmab_BradBaileyMember_label_en-US" xlink:label="lab_gmab_BradBaileyMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Brad Bailey [Member]</link:label>
    <link:label id="lab_gmab_BradBaileyMember_documentation_en-US" xlink:label="lab_gmab_BradBaileyMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This member stands for Brad Bailey.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_BradBaileyMember" xlink:href="gmab-20251231.xsd#gmab_BradBaileyMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_BradBaileyMember" xlink:to="lab_gmab_BradBaileyMember" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_EuropeanGovernmentBondsAndTreasuryBillsMember_04f3ad78-85ad-49f3-9a2f-2f108e1df9cc_terseLabel_en-US" xlink:label="lab_gmab_EuropeanGovernmentBondsAndTreasuryBillsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">European government bonds and treasury bills</link:label>
    <link:label id="lab_gmab_EuropeanGovernmentBondsAndTreasuryBillsMember_label_en-US" xlink:label="lab_gmab_EuropeanGovernmentBondsAndTreasuryBillsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">European Government Bonds And Treasury Bills [Member]</link:label>
    <link:label id="lab_gmab_EuropeanGovernmentBondsAndTreasuryBillsMember_documentation_en-US" xlink:label="lab_gmab_EuropeanGovernmentBondsAndTreasuryBillsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This member stands for European government bonds and treasury bills.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_EuropeanGovernmentBondsAndTreasuryBillsMember" xlink:href="gmab-20251231.xsd#gmab_EuropeanGovernmentBondsAndTreasuryBillsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_EuropeanGovernmentBondsAndTreasuryBillsMember" xlink:to="lab_gmab_EuropeanGovernmentBondsAndTreasuryBillsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_KeyManagementPersonnelCompensationBaseSalary_4f0a5fcd-6fb7-4d2b-9363-9d9c2c0352a1_terseLabel_en-US" xlink:label="lab_gmab_KeyManagementPersonnelCompensationBaseSalary" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Base Salary</link:label>
    <link:label id="lab_gmab_KeyManagementPersonnelCompensationBaseSalary_label_en-US" xlink:label="lab_gmab_KeyManagementPersonnelCompensationBaseSalary" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Key Management Personnel Compensation, Base Salary</link:label>
    <link:label id="lab_gmab_KeyManagementPersonnelCompensationBaseSalary_documentation_en-US" xlink:label="lab_gmab_KeyManagementPersonnelCompensationBaseSalary" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The amount of compensation to key management personnel in the form of base salary.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_KeyManagementPersonnelCompensationBaseSalary" xlink:href="gmab-20251231.xsd#gmab_KeyManagementPersonnelCompensationBaseSalary"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_KeyManagementPersonnelCompensationBaseSalary" xlink:to="lab_gmab_KeyManagementPersonnelCompensationBaseSalary" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_LeaseholdImprovementsMember_8a4cf2fa-6f00-4ef3-83a8-cb0485b7247c_terseLabel_en-US" xlink:label="lab_ifrs-full_LeaseholdImprovementsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Leasehold improvements</link:label>
    <link:label id="lab_ifrs-full_LeaseholdImprovementsMember_label_en-US" xlink:label="lab_ifrs-full_LeaseholdImprovementsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Leasehold improvements [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LeaseholdImprovementsMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LeaseholdImprovementsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_LeaseholdImprovementsMember" xlink:to="lab_ifrs-full_LeaseholdImprovementsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretations_019c49a8-29fa-7c0e-a90b-04cfd238cf64_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretations" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">New Accounting Policies and Disclosures Effective in 2026 or Later</link:label>
    <link:label id="lab_ifrs-full_DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretations_label_en-US" xlink:label="lab_ifrs-full_DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretations" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of expected impact of initial application of new standards or interpretations [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretations" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretations"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretations" xlink:to="lab_ifrs-full_DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretations" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_GenmabFranceSASMember_019b07a7-9db3-7e1a-9929-a814c0e4efd5_terseLabel_en-US" xlink:label="lab_gmab_GenmabFranceSASMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Genmab France SAS</link:label>
    <link:label id="lab_gmab_GenmabFranceSASMember_label_en-US" xlink:label="lab_gmab_GenmabFranceSASMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Genmab France SAS [Member]</link:label>
    <link:label id="lab_gmab_GenmabFranceSASMember_documentation_en-US" xlink:label="lab_gmab_GenmabFranceSASMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Genmab France SAS</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_GenmabFranceSASMember" xlink:href="gmab-20251231.xsd#gmab_GenmabFranceSASMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_GenmabFranceSASMember" xlink:to="lab_gmab_GenmabFranceSASMember" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_OperatingAssetsAndLiabilitiesAbstract_label_en-US" xlink:label="lab_gmab_OperatingAssetsAndLiabilitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Assets and Liabilities [Abstract]</link:label>
    <link:label id="lab_gmab_OperatingAssetsAndLiabilitiesAbstract_documentation_en-US" xlink:label="lab_gmab_OperatingAssetsAndLiabilitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">No definition available.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_OperatingAssetsAndLiabilitiesAbstract" xlink:href="gmab-20251231.xsd#gmab_OperatingAssetsAndLiabilitiesAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_OperatingAssetsAndLiabilitiesAbstract" xlink:to="lab_gmab_OperatingAssetsAndLiabilitiesAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ForeignExchangeGain_93f7e1e9-b252-46d4-aed5-61a398121204_terseLabel_en-US" xlink:label="lab_ifrs-full_ForeignExchangeGain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Foreign exchange rate gain</link:label>
    <link:label id="lab_ifrs-full_ForeignExchangeGain_label_en-US" xlink:label="lab_ifrs-full_ForeignExchangeGain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Foreign exchange gain</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ForeignExchangeGain" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ForeignExchangeGain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ForeignExchangeGain" xlink:to="lab_ifrs-full_ForeignExchangeGain" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_KeyManagementPersonnelCompensation_42667783-04b5-49d6-99b3-602bd37d38c1_totalLabel_en-US" xlink:label="lab_ifrs-full_KeyManagementPersonnelCompensation" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total</link:label>
    <link:label id="lab_ifrs-full_KeyManagementPersonnelCompensation_label_en-US" xlink:label="lab_ifrs-full_KeyManagementPersonnelCompensation" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Key management personnel compensation</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_KeyManagementPersonnelCompensation" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_KeyManagementPersonnelCompensation"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_KeyManagementPersonnelCompensation" xlink:to="lab_ifrs-full_KeyManagementPersonnelCompensation" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_WeightedAverageExpectedDividendYieldWarrantsGranted_4a0176ec-d525-4020-b597-534c30d91bac_terseLabel_en-US" xlink:label="lab_gmab_WeightedAverageExpectedDividendYieldWarrantsGranted" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Expected dividend yield</link:label>
    <link:label id="lab_gmab_WeightedAverageExpectedDividendYieldWarrantsGranted_label_en-US" xlink:label="lab_gmab_WeightedAverageExpectedDividendYieldWarrantsGranted" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Weighted Average Expected Dividend Yield, Warrants Granted</link:label>
    <link:label id="lab_gmab_WeightedAverageExpectedDividendYieldWarrantsGranted_documentation_en-US" xlink:label="lab_gmab_WeightedAverageExpectedDividendYieldWarrantsGranted" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The percentage of an expected dividend used to calculate the fair value of warrants granted.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_WeightedAverageExpectedDividendYieldWarrantsGranted" xlink:href="gmab-20251231.xsd#gmab_WeightedAverageExpectedDividendYieldWarrantsGranted"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_WeightedAverageExpectedDividendYieldWarrantsGranted" xlink:to="lab_gmab_WeightedAverageExpectedDividendYieldWarrantsGranted" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfCreditRiskExposureLineItems_3871970b-24cb-4652-a2f1-33d95f212f67_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfCreditRiskExposureLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure of credit risk exposure [line items]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfCreditRiskExposureLineItems_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfCreditRiskExposureLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of credit risk exposure [line items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfCreditRiskExposureLineItems" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfCreditRiskExposureLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfCreditRiskExposureLineItems" xlink:to="lab_ifrs-full_DisclosureOfCreditRiskExposureLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_OrdinarySharesMember_019b8ee4-b0f4-7221-a270-8ede13277172_terseLabel_en-US" xlink:label="lab_ifrs-full_OrdinarySharesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Ordinary shares</link:label>
    <link:label id="lab_ifrs-full_OrdinarySharesMember_label_en-US" xlink:label="lab_ifrs-full_OrdinarySharesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Ordinary shares [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OrdinarySharesMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OrdinarySharesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OrdinarySharesMember" xlink:to="lab_ifrs-full_OrdinarySharesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CurrentTradeReceivables_c2884a30-70ea-48c1-8f2d-613c536a1300_terseLabel_en-US" xlink:label="lab_ifrs-full_CurrentTradeReceivables" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Trade receivables related to product sales</link:label>
    <link:label id="lab_ifrs-full_CurrentTradeReceivables_label_en-US" xlink:label="lab_ifrs-full_CurrentTradeReceivables" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Current trade receivables</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentTradeReceivables" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CurrentTradeReceivables"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CurrentTradeReceivables" xlink:to="lab_ifrs-full_CurrentTradeReceivables" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfAuditorsRemunerationExplanatory_211c8f57-eca9-4e73-b0a7-67a959eaa32c_verboseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfAuditorsRemunerationExplanatory" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Summary of fees to auditors</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfAuditorsRemunerationExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfAuditorsRemunerationExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of auditors' remuneration [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfAuditorsRemunerationExplanatory" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfAuditorsRemunerationExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfAuditorsRemunerationExplanatory" xlink:to="lab_ifrs-full_DisclosureOfAuditorsRemunerationExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfEarningsPerShareExplanatory_16adbbcb-d2ab-4039-895f-30c517cde4db_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfEarningsPerShareExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of profit per share</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfEarningsPerShareExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfEarningsPerShareExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of earnings per share [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfEarningsPerShareExplanatory" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfEarningsPerShareExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfEarningsPerShareExplanatory" xlink:to="lab_ifrs-full_DisclosureOfEarningsPerShareExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_BorrowingsExcessCashFlowThreshold_019c054d-e850-79d7-82ae-9e64a0b8af66_terseLabel_en-US" xlink:label="lab_gmab_BorrowingsExcessCashFlowThreshold" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Excess cash flow threshold</link:label>
    <link:label id="lab_gmab_BorrowingsExcessCashFlowThreshold_label_en-US" xlink:label="lab_gmab_BorrowingsExcessCashFlowThreshold" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Borrowings, Excess Cash Flow, Threshold</link:label>
    <link:label id="lab_gmab_BorrowingsExcessCashFlowThreshold_documentation_en-US" xlink:label="lab_gmab_BorrowingsExcessCashFlowThreshold" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Borrowings, Excess Cash Flow, Threshold</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_BorrowingsExcessCashFlowThreshold" xlink:href="gmab-20251231.xsd#gmab_BorrowingsExcessCashFlowThreshold"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_BorrowingsExcessCashFlowThreshold" xlink:to="lab_gmab_BorrowingsExcessCashFlowThreshold" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_GrossCarryingAmountMember_b9e40d2e-2f01-41fd-be9a-d4c604f2e70d_terseLabel_en-US" xlink:label="lab_ifrs-full_GrossCarryingAmountMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Gross carrying value</link:label>
    <link:label id="lab_ifrs-full_GrossCarryingAmountMember_019c4eba-f665-70ea-b4c3-5bc0973511ca_verboseLabel_en-US" xlink:label="lab_ifrs-full_GrossCarryingAmountMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Gross</link:label>
    <link:label id="lab_ifrs-full_GrossCarryingAmountMember_label_en-US" xlink:label="lab_ifrs-full_GrossCarryingAmountMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Gross carrying amount [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GrossCarryingAmountMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GrossCarryingAmountMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_GrossCarryingAmountMember" xlink:to="lab_ifrs-full_GrossCarryingAmountMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ApplicableTaxRate_79dbd5b9-5b2d-47fe-ac37-53b646218038_terseLabel_en-US" xlink:label="lab_ifrs-full_ApplicableTaxRate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Applicable tax rate (%)</link:label>
    <link:label id="lab_ifrs-full_ApplicableTaxRate_label_en-US" xlink:label="lab_ifrs-full_ApplicableTaxRate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Applicable tax rate</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ApplicableTaxRate" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ApplicableTaxRate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ApplicableTaxRate" xlink:to="lab_ifrs-full_ApplicableTaxRate" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AuditorsRemunerationAbstract_2535846a-f0ad-4f32-bce4-b08f36e21815_terseLabel_en-US" xlink:label="lab_ifrs-full_AuditorsRemunerationAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fees to Auditors Appointed at the Annual General Meeting</link:label>
    <link:label id="lab_ifrs-full_AuditorsRemunerationAbstract_label_en-US" xlink:label="lab_ifrs-full_AuditorsRemunerationAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Auditor's remuneration [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AuditorsRemunerationAbstract" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AuditorsRemunerationAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AuditorsRemunerationAbstract" xlink:to="lab_ifrs-full_AuditorsRemunerationAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AdjustmentsForIncreaseDecreaseInOtherLiabilities_c9eda5a0-86b5-446d-917f-8f08267d7519_terseLabel_en-US" xlink:label="lab_ifrs-full_AdjustmentsForIncreaseDecreaseInOtherLiabilities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other payables</link:label>
    <link:label id="lab_ifrs-full_AdjustmentsForIncreaseDecreaseInOtherLiabilities_label_en-US" xlink:label="lab_ifrs-full_AdjustmentsForIncreaseDecreaseInOtherLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Adjustments for increase (decrease) in other liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForIncreaseDecreaseInOtherLiabilities" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AdjustmentsForIncreaseDecreaseInOtherLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AdjustmentsForIncreaseDecreaseInOtherLiabilities" xlink:to="lab_ifrs-full_AdjustmentsForIncreaseDecreaseInOtherLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AdjustmentsForFinanceCosts_e40f39cc-0b3a-403a-a039-3e1b70979806_terseLabel_en-US" xlink:label="lab_ifrs-full_AdjustmentsForFinanceCosts" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Financial expense</link:label>
    <link:label id="lab_ifrs-full_AdjustmentsForFinanceCosts_label_en-US" xlink:label="lab_ifrs-full_AdjustmentsForFinanceCosts" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Adjustments for finance costs</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForFinanceCosts" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AdjustmentsForFinanceCosts"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AdjustmentsForFinanceCosts" xlink:to="lab_ifrs-full_AdjustmentsForFinanceCosts" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_LocalPhoneNumber_019b0cd4-9927-7c30-9df2-4068d3e4aaa8_terseLabel_en-US" xlink:label="lab_dei_LocalPhoneNumber" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Local Phone Number</link:label>
    <link:label id="lab_dei_LocalPhoneNumber_label_en-US" xlink:label="lab_dei_LocalPhoneNumber" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Local Phone Number</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LocalPhoneNumber"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_LocalPhoneNumber" xlink:to="lab_dei_LocalPhoneNumber" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_NotLaterThanOneYearMember_9cc10f96-c339-407c-a70d-327258482860_terseLabel_en-US" xlink:label="lab_ifrs-full_NotLaterThanOneYearMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Within 1 year</link:label>
    <link:label id="lab_ifrs-full_NotLaterThanOneYearMember_a635aefe-5ad7-4227-9f6c-0a9d2f30b823_verboseLabel_en-US" xlink:label="lab_ifrs-full_NotLaterThanOneYearMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">2025</link:label>
    <link:label id="lab_ifrs-full_NotLaterThanOneYearMember_label_en-US" xlink:label="lab_ifrs-full_NotLaterThanOneYearMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Not later than one year [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NotLaterThanOneYearMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NotLaterThanOneYearMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_NotLaterThanOneYearMember" xlink:to="lab_ifrs-full_NotLaterThanOneYearMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfAmountsIncurredByEntityForProvisionOfKeyManagementPersonnelServicesProvidedBySeparateManagementEntitiesExplanatory_c9951bd3-d622-432f-bf83-f7bec727e24e_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfAmountsIncurredByEntityForProvisionOfKeyManagementPersonnelServicesProvidedBySeparateManagementEntitiesExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Summary of remuneration of the Board of Directors and Executive Management</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfAmountsIncurredByEntityForProvisionOfKeyManagementPersonnelServicesProvidedBySeparateManagementEntitiesExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfAmountsIncurredByEntityForProvisionOfKeyManagementPersonnelServicesProvidedBySeparateManagementEntitiesExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of amounts incurred by entity for provision of key management personnel services provided by separate management entities [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfAmountsIncurredByEntityForProvisionOfKeyManagementPersonnelServicesProvidedBySeparateManagementEntitiesExplanatory" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfAmountsIncurredByEntityForProvisionOfKeyManagementPersonnelServicesProvidedBySeparateManagementEntitiesExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfAmountsIncurredByEntityForProvisionOfKeyManagementPersonnelServicesProvidedBySeparateManagementEntitiesExplanatory" xlink:to="lab_ifrs-full_DisclosureOfAmountsIncurredByEntityForProvisionOfKeyManagementPersonnelServicesProvidedBySeparateManagementEntitiesExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_RoyaltiesMember_fd578d23-bad6-4369-9557-e51a85b1d9c5_terseLabel_en-US" xlink:label="lab_gmab_RoyaltiesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Royalties</link:label>
    <link:label id="lab_gmab_RoyaltiesMember_label_en-US" xlink:label="lab_gmab_RoyaltiesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Royalties [Member]</link:label>
    <link:label id="lab_gmab_RoyaltiesMember_documentation_en-US" xlink:label="lab_gmab_RoyaltiesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This member stands for revenue form royalties.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_RoyaltiesMember" xlink:href="gmab-20251231.xsd#gmab_RoyaltiesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_RoyaltiesMember" xlink:to="lab_gmab_RoyaltiesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_GenmabSuzhouCo.LtdMember_019c5862-82b4-72d7-a8f0-8aea89d71f35_terseLabel_en-US" xlink:label="lab_gmab_GenmabSuzhouCo.LtdMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Genmab (Suzhou) Co., Ltd.</link:label>
    <link:label id="lab_gmab_GenmabSuzhouCo.LtdMember_label_en-US" xlink:label="lab_gmab_GenmabSuzhouCo.LtdMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Genmab (Suzhou) Co., Ltd [Member]</link:label>
    <link:label id="lab_gmab_GenmabSuzhouCo.LtdMember_documentation_en-US" xlink:label="lab_gmab_GenmabSuzhouCo.LtdMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Genmab (Suzhou) Co., Ltd</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_GenmabSuzhouCo.LtdMember" xlink:href="gmab-20251231.xsd#gmab_GenmabSuzhouCo.LtdMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_GenmabSuzhouCo.LtdMember" xlink:to="lab_gmab_GenmabSuzhouCo.LtdMember" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_LicensesAndPatentsMember_019c22fe-15f2-7477-a2b7-470627d1c68e_terseLabel_en-US" xlink:label="lab_gmab_LicensesAndPatentsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Licenses and patents</link:label>
    <link:label id="lab_gmab_LicensesAndPatentsMember_b4062922-d88d-4a61-86be-1ee0c0e11e4e_verboseLabel_en-US" xlink:label="lab_gmab_LicensesAndPatentsMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Licenses and Patents</link:label>
    <link:label id="lab_gmab_LicensesAndPatentsMember_label_en-US" xlink:label="lab_gmab_LicensesAndPatentsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Licenses and Patents [Member]</link:label>
    <link:label id="lab_gmab_LicensesAndPatentsMember_documentation_en-US" xlink:label="lab_gmab_LicensesAndPatentsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This member stands for a class of intangible assets representing licenses and patents.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_LicensesAndPatentsMember" xlink:href="gmab-20251231.xsd#gmab_LicensesAndPatentsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_LicensesAndPatentsMember" xlink:to="lab_gmab_LicensesAndPatentsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_IdentifiableIntangibleAssetsRecognisedAsOfAcquisitionDate_4696c1db-aa1e-4a3d-a69e-a6a18c5b0e07_terseLabel_en-US" xlink:label="lab_ifrs-full_IdentifiableIntangibleAssetsRecognisedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Intangible asset</link:label>
    <link:label id="lab_ifrs-full_IdentifiableIntangibleAssetsRecognisedAsOfAcquisitionDate_label_en-US" xlink:label="lab_ifrs-full_IdentifiableIntangibleAssetsRecognisedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Identifiable intangible assets recognised as of acquisition date</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IdentifiableIntangibleAssetsRecognisedAsOfAcquisitionDate" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IdentifiableIntangibleAssetsRecognisedAsOfAcquisitionDate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_IdentifiableIntangibleAssetsRecognisedAsOfAcquisitionDate" xlink:to="lab_ifrs-full_IdentifiableIntangibleAssetsRecognisedAsOfAcquisitionDate" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AuditorsRemuneration_f0ba3618-f6d6-4c15-90d4-7dc2a44b6c7c_totalLabel_en-US" xlink:label="lab_ifrs-full_AuditorsRemuneration" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total</link:label>
    <link:label id="lab_ifrs-full_AuditorsRemuneration_label_en-US" xlink:label="lab_ifrs-full_AuditorsRemuneration" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Auditor's remuneration</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AuditorsRemuneration" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AuditorsRemuneration"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AuditorsRemuneration" xlink:to="lab_ifrs-full_AuditorsRemuneration" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_TreasurySharesAtCost_953d8319-5899-45f4-9ae9-444ce7690bdf_periodStartLabel_en-US" xlink:label="lab_gmab_TreasurySharesAtCost" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Cost, at beginning of period</link:label>
    <link:label id="lab_gmab_TreasurySharesAtCost_688199ed-d8ea-42e6-ad6f-d2a2af6b4683_periodEndLabel_en-US" xlink:label="lab_gmab_TreasurySharesAtCost" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Cost at end of period</link:label>
    <link:label id="lab_gmab_TreasurySharesAtCost_label_en-US" xlink:label="lab_gmab_TreasurySharesAtCost" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Treasury Shares, At Cost</link:label>
    <link:label id="lab_gmab_TreasurySharesAtCost_documentation_en-US" xlink:label="lab_gmab_TreasurySharesAtCost" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Cost of treasury shares.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_TreasurySharesAtCost" xlink:href="gmab-20251231.xsd#gmab_TreasurySharesAtCost"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_TreasurySharesAtCost" xlink:to="lab_gmab_TreasurySharesAtCost" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_ContractTransactionPrice_224cdd79-c262-4fe9-b96c-94676a18add9_terseLabel_en-US" xlink:label="lab_gmab_ContractTransactionPrice" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Contract transaction price</link:label>
    <link:label id="lab_gmab_ContractTransactionPrice_label_en-US" xlink:label="lab_gmab_ContractTransactionPrice" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Contract Transaction Price</link:label>
    <link:label id="lab_gmab_ContractTransactionPrice_documentation_en-US" xlink:label="lab_gmab_ContractTransactionPrice" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The identified transaction price under the contract.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_ContractTransactionPrice" xlink:href="gmab-20251231.xsd#gmab_ContractTransactionPrice"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_ContractTransactionPrice" xlink:to="lab_gmab_ContractTransactionPrice" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_LongtermBorrowings_019bbb94-076e-7bb9-8176-57e3b8160649_verboseLabel_en-US" xlink:label="lab_ifrs-full_LongtermBorrowings" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Borrowings</link:label>
    <link:label id="lab_ifrs-full_LongtermBorrowings_019b0776-0e7b-7b6b-9b36-856000ee8a45_terseLabel_en-US" xlink:label="lab_ifrs-full_LongtermBorrowings" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Non-Current</link:label>
    <link:label id="lab_ifrs-full_LongtermBorrowings_label_en-US" xlink:label="lab_ifrs-full_LongtermBorrowings" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Non-current portion of non-current borrowings</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LongtermBorrowings" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LongtermBorrowings"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_LongtermBorrowings" xlink:to="lab_ifrs-full_LongtermBorrowings" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_AdjustmentsForForeignExchangeRates_019c4ecd-5bf3-7ef1-8725-9ec272c3b417_terseLabel_en-US" xlink:label="lab_gmab_AdjustmentsForForeignExchangeRates" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Effect of exchange rate adjustment</link:label>
    <link:label id="lab_gmab_AdjustmentsForForeignExchangeRates_label_en-US" xlink:label="lab_gmab_AdjustmentsForForeignExchangeRates" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Adjustments For Foreign Exchange Rates</link:label>
    <link:label id="lab_gmab_AdjustmentsForForeignExchangeRates_documentation_en-US" xlink:label="lab_gmab_AdjustmentsForForeignExchangeRates" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Adjustments For Foreign Exchange Rates</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_AdjustmentsForForeignExchangeRates" xlink:href="gmab-20251231.xsd#gmab_AdjustmentsForForeignExchangeRates"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_AdjustmentsForForeignExchangeRates" xlink:to="lab_gmab_AdjustmentsForForeignExchangeRates" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AdjustmentsForDecreaseIncreaseInInventories_587138fd-4203-46d3-b177-ab40d8e14a3a_terseLabel_en-US" xlink:label="lab_ifrs-full_AdjustmentsForDecreaseIncreaseInInventories" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Inventories</link:label>
    <link:label id="lab_ifrs-full_AdjustmentsForDecreaseIncreaseInInventories_label_en-US" xlink:label="lab_ifrs-full_AdjustmentsForDecreaseIncreaseInInventories" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Adjustments for decrease (increase) in inventories</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForDecreaseIncreaseInInventories" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AdjustmentsForDecreaseIncreaseInInventories"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AdjustmentsForDecreaseIncreaseInInventories" xlink:to="lab_ifrs-full_AdjustmentsForDecreaseIncreaseInInventories" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfFinancialAssetsLineItems_9ae490ce-61eb-4e18-98b7-d74f2e6b3887_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfFinancialAssetsLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure of financial assets [line items]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfFinancialAssetsLineItems_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfFinancialAssetsLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of financial assets [line items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfFinancialAssetsLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems" xlink:to="lab_ifrs-full_DisclosureOfFinancialAssetsLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_PropertyPlantAndEquipmentMember_b18fe6c7-eebc-4938-b475-392c796dbe31_terseLabel_en-US" xlink:label="lab_ifrs-full_PropertyPlantAndEquipmentMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Property, plant and equipment</link:label>
    <link:label id="lab_ifrs-full_PropertyPlantAndEquipmentMember_label_en-US" xlink:label="lab_ifrs-full_PropertyPlantAndEquipmentMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property, plant and equipment [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PropertyPlantAndEquipmentMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PropertyPlantAndEquipmentMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_PropertyPlantAndEquipmentMember" xlink:to="lab_ifrs-full_PropertyPlantAndEquipmentMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForPropertyPlantAndEquipmentExplanatory_019bbbff-680d-79a7-9ffe-5b16ce393f16_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForPropertyPlantAndEquipmentExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Property and Equipment</link:label>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForPropertyPlantAndEquipmentExplanatory_label_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForPropertyPlantAndEquipmentExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Description of accounting policy for property, plant and equipment [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForPropertyPlantAndEquipmentExplanatory" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DescriptionOfAccountingPolicyForPropertyPlantAndEquipmentExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DescriptionOfAccountingPolicyForPropertyPlantAndEquipmentExplanatory" xlink:to="lab_ifrs-full_DescriptionOfAccountingPolicyForPropertyPlantAndEquipmentExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred_73bb6329-2c15-49bb-9946-942c4bfcee12_terseLabel_en-US" xlink:label="lab_ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Consideration transferred, acquisition-date fair value</link:label>
    <link:label id="lab_ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred_55639865-f5f8-4f98-b74c-86690878524e_totalLabel_en-US" xlink:label="lab_ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total consideration</link:label>
    <link:label id="lab_ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred_label_en-US" xlink:label="lab_ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Consideration transferred, acquisition-date fair value</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred" xlink:to="lab_ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ProceedsFromBorrowingsClassifiedAsFinancingActivities_019b078c-76a8-7c9d-b5be-51fafd46b41d_terseLabel_en-US" xlink:label="lab_ifrs-full_ProceedsFromBorrowingsClassifiedAsFinancingActivities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Proceeds from issuance of borrowings</link:label>
    <link:label id="lab_ifrs-full_ProceedsFromBorrowingsClassifiedAsFinancingActivities_label_en-US" xlink:label="lab_ifrs-full_ProceedsFromBorrowingsClassifiedAsFinancingActivities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proceeds from borrowings, classified as financing activities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProceedsFromBorrowingsClassifiedAsFinancingActivities" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProceedsFromBorrowingsClassifiedAsFinancingActivities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ProceedsFromBorrowingsClassifiedAsFinancingActivities" xlink:to="lab_ifrs-full_ProceedsFromBorrowingsClassifiedAsFinancingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_ScheduleOfInventoriesLineItems_e2a8a277-93ef-477c-8a05-d540eab0c0cd_terseLabel_en-US" xlink:label="lab_gmab_ScheduleOfInventoriesLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Inventories [Line Items]</link:label>
    <link:label id="lab_gmab_ScheduleOfInventoriesLineItems_label_en-US" xlink:label="lab_gmab_ScheduleOfInventoriesLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Inventories [Line Items]</link:label>
    <link:label id="lab_gmab_ScheduleOfInventoriesLineItems_documentation_en-US" xlink:label="lab_gmab_ScheduleOfInventoriesLineItems" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Line item of inventories.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_ScheduleOfInventoriesLineItems" xlink:href="gmab-20251231.xsd#gmab_ScheduleOfInventoriesLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_ScheduleOfInventoriesLineItems" xlink:to="lab_gmab_ScheduleOfInventoriesLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities_496dafdf-939e-4469-8b1c-217911b2f87a_negatedLabel_en-US" xlink:label="lab_ifrs-full_PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Principal elements of lease payments</link:label>
    <link:label id="lab_ifrs-full_PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities_label_en-US" xlink:label="lab_ifrs-full_PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments of lease liabilities, classified as financing activities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities" xlink:to="lab_ifrs-full_PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityVoluntaryFilers_019b45ae-099a-79a1-a50d-1322eb448ef3_terseLabel_en-US" xlink:label="lab_dei_EntityVoluntaryFilers" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Voluntary Filers</link:label>
    <link:label id="lab_dei_EntityVoluntaryFilers_label_en-US" xlink:label="lab_dei_EntityVoluntaryFilers" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Voluntary Filers</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityVoluntaryFilers" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityVoluntaryFilers"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityVoluntaryFilers" xlink:to="lab_dei_EntityVoluntaryFilers" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ProportionOfOwnershipInterestInSubsidiary_9ae5f2e7-47d5-4cb5-80ad-f08bb98bb98e_terseLabel_en-US" xlink:label="lab_ifrs-full_ProportionOfOwnershipInterestInSubsidiary" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Percentage of ownership interest in subsidiary</link:label>
    <link:label id="lab_ifrs-full_ProportionOfOwnershipInterestInSubsidiary_label_en-US" xlink:label="lab_ifrs-full_ProportionOfOwnershipInterestInSubsidiary" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proportion of ownership interest in subsidiary</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProportionOfOwnershipInterestInSubsidiary" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProportionOfOwnershipInterestInSubsidiary"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ProportionOfOwnershipInterestInSubsidiary" xlink:to="lab_ifrs-full_ProportionOfOwnershipInterestInSubsidiary" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_RoyaltiesByProductDomain_f652da26-795b-48cc-aaa3-0744642bd044_terseLabel_en-US" xlink:label="lab_gmab_RoyaltiesByProductDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Royalties by Product [Domain]</link:label>
    <link:label id="lab_gmab_RoyaltiesByProductDomain_label_en-US" xlink:label="lab_gmab_RoyaltiesByProductDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Royalties by Product [Domain]</link:label>
    <link:label id="lab_gmab_RoyaltiesByProductDomain_documentation_en-US" xlink:label="lab_gmab_RoyaltiesByProductDomain" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Information by royalties by product.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_RoyaltiesByProductDomain" xlink:href="gmab-20251231.xsd#gmab_RoyaltiesByProductDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_RoyaltiesByProductDomain" xlink:to="lab_gmab_RoyaltiesByProductDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityRegistrantName_852ec34b-e4aa-4d7c-b5a4-6cc1e56d8c67_terseLabel_en-US" xlink:label="lab_dei_EntityRegistrantName" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Registrant Name</link:label>
    <link:label id="lab_dei_EntityRegistrantName_label_en-US" xlink:label="lab_dei_EntityRegistrantName" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Registrant Name</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityRegistrantName"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityRegistrantName" xlink:to="lab_dei_EntityRegistrantName" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_RawMaterials_49f0205b-d795-49b2-aed6-a8293ef2ba50_terseLabel_en-US" xlink:label="lab_ifrs-full_RawMaterials" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Raw materials</link:label>
    <link:label id="lab_ifrs-full_RawMaterials_label_en-US" xlink:label="lab_ifrs-full_RawMaterials" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Current raw materials</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RawMaterials" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RawMaterials"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_RawMaterials" xlink:to="lab_ifrs-full_RawMaterials" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_BasicEarningsLossPerShare_c74a7f72-9703-4704-98c6-a6c8cdf5cee4_terseLabel_en-US" xlink:label="lab_ifrs-full_BasicEarningsLossPerShare" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Basic net profit per share (in dollars per share)</link:label>
    <link:label id="lab_ifrs-full_BasicEarningsLossPerShare_0a015090-d0fc-4bb8-b793-769a7cba6583_verboseLabel_en-US" xlink:label="lab_ifrs-full_BasicEarningsLossPerShare" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Earnings per share - basic (in DKK and US Dollars per share)</link:label>
    <link:label id="lab_ifrs-full_BasicEarningsLossPerShare_label_en-US" xlink:label="lab_ifrs-full_BasicEarningsLossPerShare" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Basic earnings (loss) per share</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BasicEarningsLossPerShare" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BasicEarningsLossPerShare"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_BasicEarningsLossPerShare" xlink:to="lab_ifrs-full_BasicEarningsLossPerShare" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_FinancialIncomeAbstract_019b07cc-1e2a-74c9-a18c-ed63b8eb50ac_terseLabel_en-US" xlink:label="lab_gmab_FinancialIncomeAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Financial income:</link:label>
    <link:label id="lab_gmab_FinancialIncomeAbstract_label_en-US" xlink:label="lab_gmab_FinancialIncomeAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Financial Income [Abstract]</link:label>
    <link:label id="lab_gmab_FinancialIncomeAbstract_documentation_en-US" xlink:label="lab_gmab_FinancialIncomeAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Financial Income</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_FinancialIncomeAbstract" xlink:href="gmab-20251231.xsd#gmab_FinancialIncomeAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_FinancialIncomeAbstract" xlink:to="lab_gmab_FinancialIncomeAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_WeightedAverageRemainingContractualLifeOfOutstandingWarrants_e8babadd-877f-4f74-ace5-6e885ef6fce8_terseLabel_en-US" xlink:label="lab_gmab_WeightedAverageRemainingContractualLifeOfOutstandingWarrants" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Weighted average remaining contractual life (in years)</link:label>
    <link:label id="lab_gmab_WeightedAverageRemainingContractualLifeOfOutstandingWarrants_label_en-US" xlink:label="lab_gmab_WeightedAverageRemainingContractualLifeOfOutstandingWarrants" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Weighted Average Remaining Contractual Life Of Outstanding Warrants</link:label>
    <link:label id="lab_gmab_WeightedAverageRemainingContractualLifeOfOutstandingWarrants_documentation_en-US" xlink:label="lab_gmab_WeightedAverageRemainingContractualLifeOfOutstandingWarrants" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Weighted average remaining contractual life of outstanding warrants.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_WeightedAverageRemainingContractualLifeOfOutstandingWarrants" xlink:href="gmab-20251231.xsd#gmab_WeightedAverageRemainingContractualLifeOfOutstandingWarrants"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_WeightedAverageRemainingContractualLifeOfOutstandingWarrants" xlink:to="lab_gmab_WeightedAverageRemainingContractualLifeOfOutstandingWarrants" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_MeasurementAxis_3766d6fa-0992-444d-bc7a-86d9ad4ded03_terseLabel_en-US" xlink:label="lab_ifrs-full_MeasurementAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Measurement [axis]</link:label>
    <link:label id="lab_ifrs-full_MeasurementAxis_label_en-US" xlink:label="lab_ifrs-full_MeasurementAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Measurement [axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MeasurementAxis" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MeasurementAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_MeasurementAxis" xlink:to="lab_ifrs-full_MeasurementAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AdjustedWeightedAverageShares_072d9064-fce3-4127-9325-764aaa8b8e6c_totalLabel_en-US" xlink:label="lab_ifrs-full_AdjustedWeightedAverageShares" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Weighted average number of shares, diluted (in shares)</link:label>
    <link:label id="lab_ifrs-full_AdjustedWeightedAverageShares_label_en-US" xlink:label="lab_ifrs-full_AdjustedWeightedAverageShares" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Weighted average number of ordinary shares used in calculating diluted earnings per share</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustedWeightedAverageShares" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AdjustedWeightedAverageShares"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AdjustedWeightedAverageShares" xlink:to="lab_ifrs-full_AdjustedWeightedAverageShares" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_NovartisMember_eb6449ea-e68a-4a8e-8751-2a55170e72bb_terseLabel_en-US" xlink:label="lab_gmab_NovartisMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Novartis</link:label>
    <link:label id="lab_gmab_NovartisMember_label_en-US" xlink:label="lab_gmab_NovartisMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Novartis [Member]</link:label>
    <link:label id="lab_gmab_NovartisMember_documentation_en-US" xlink:label="lab_gmab_NovartisMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This member stands for collaborative arrangement with Novartis.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_NovartisMember" xlink:href="gmab-20251231.xsd#gmab_NovartisMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_NovartisMember" xlink:to="lab_gmab_NovartisMember" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_DisclosureOfValuationAssumptionsForWarrantsGrantedTableTextBlock_13e1d05a-b468-491f-be22-cbfea004346b_terseLabel_en-US" xlink:label="lab_gmab_DisclosureOfValuationAssumptionsForWarrantsGrantedTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of fair value of each warrant granted</link:label>
    <link:label id="lab_gmab_DisclosureOfValuationAssumptionsForWarrantsGrantedTableTextBlock_label_en-US" xlink:label="lab_gmab_DisclosureOfValuationAssumptionsForWarrantsGrantedTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of Valuation Assumptions for Warrants Granted [Table Text Block]</link:label>
    <link:label id="lab_gmab_DisclosureOfValuationAssumptionsForWarrantsGrantedTableTextBlock_documentation_en-US" xlink:label="lab_gmab_DisclosureOfValuationAssumptionsForWarrantsGrantedTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Tabular disclosure of fair value of each warrant granted.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_DisclosureOfValuationAssumptionsForWarrantsGrantedTableTextBlock" xlink:href="gmab-20251231.xsd#gmab_DisclosureOfValuationAssumptionsForWarrantsGrantedTableTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_DisclosureOfValuationAssumptionsForWarrantsGrantedTableTextBlock" xlink:to="lab_gmab_DisclosureOfValuationAssumptionsForWarrantsGrantedTableTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillDomain_019b26da-8beb-7e2e-adf2-d4bd1100da69_terseLabel_en-US" xlink:label="lab_ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Classes of intangible assets other than goodwill [domain]</link:label>
    <link:label id="lab_ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillDomain_label_en-US" xlink:label="lab_ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Classes of intangible assets other than goodwill [domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillDomain" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillDomain" xlink:to="lab_ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AdjustmentsForSharebasedPayments_0b246389-de2d-40fc-ac2f-cbdff967da26_terseLabel_en-US" xlink:label="lab_ifrs-full_AdjustmentsForSharebasedPayments" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share-based compensation expense</link:label>
    <link:label id="lab_ifrs-full_AdjustmentsForSharebasedPayments_label_en-US" xlink:label="lab_ifrs-full_AdjustmentsForSharebasedPayments" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Adjustments for share-based payments</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForSharebasedPayments" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AdjustmentsForSharebasedPayments"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AdjustmentsForSharebasedPayments" xlink:to="lab_ifrs-full_AdjustmentsForSharebasedPayments" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_OtherPayables_07bef591-ecba-48d5-bc14-ed20660f1183_totalLabel_en-US" xlink:label="lab_ifrs-full_OtherPayables" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total</link:label>
    <link:label id="lab_ifrs-full_OtherPayables_label_en-US" xlink:label="lab_ifrs-full_OtherPayables" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other payables</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherPayables" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherPayables"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OtherPayables" xlink:to="lab_ifrs-full_OtherPayables" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_DisclosureOfWarrantsIssuedAndWarrantsReissuedActivityTableTextBlock_4e32942b-af8e-4f60-9b78-aee75514d0b3_terseLabel_en-US" xlink:label="lab_gmab_DisclosureOfWarrantsIssuedAndWarrantsReissuedActivityTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of warrants issued and reissued during the period</link:label>
    <link:label id="lab_gmab_DisclosureOfWarrantsIssuedAndWarrantsReissuedActivityTableTextBlock_label_en-US" xlink:label="lab_gmab_DisclosureOfWarrantsIssuedAndWarrantsReissuedActivityTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure Of Warrants Issued And Warrants Reissued Activity [Table Text Block]</link:label>
    <link:label id="lab_gmab_DisclosureOfWarrantsIssuedAndWarrantsReissuedActivityTableTextBlock_documentation_en-US" xlink:label="lab_gmab_DisclosureOfWarrantsIssuedAndWarrantsReissuedActivityTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Tabular disclosure of Warrants issued and reissued during the period.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_DisclosureOfWarrantsIssuedAndWarrantsReissuedActivityTableTextBlock" xlink:href="gmab-20251231.xsd#gmab_DisclosureOfWarrantsIssuedAndWarrantsReissuedActivityTableTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_DisclosureOfWarrantsIssuedAndWarrantsReissuedActivityTableTextBlock" xlink:to="lab_gmab_DisclosureOfWarrantsIssuedAndWarrantsReissuedActivityTableTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_PaoloPaolettiMember_a922228b-63f1-4713-a99c-6b235b3fad70_terseLabel_en-US" xlink:label="lab_gmab_PaoloPaolettiMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Paolo Paoletti</link:label>
    <link:label id="lab_gmab_PaoloPaolettiMember_label_en-US" xlink:label="lab_gmab_PaoloPaolettiMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Paolo Paoletti [Member]</link:label>
    <link:label id="lab_gmab_PaoloPaolettiMember_documentation_en-US" xlink:label="lab_gmab_PaoloPaolettiMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents information pertaining to Paolo Paoletti.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_PaoloPaolettiMember" xlink:href="gmab-20251231.xsd#gmab_PaoloPaolettiMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_PaoloPaolettiMember" xlink:to="lab_gmab_PaoloPaolettiMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfOffsettingOfFinancialAssetsAndFinancialLiabilitiesExplanatory_cb77dac8-1148-4d6a-97c9-964435b9c67d_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfOffsettingOfFinancialAssetsAndFinancialLiabilitiesExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of financial assets and liabilities, fair value measurement</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfOffsettingOfFinancialAssetsAndFinancialLiabilitiesExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfOffsettingOfFinancialAssetsAndFinancialLiabilitiesExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of offsetting of financial assets and financial liabilities [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfOffsettingOfFinancialAssetsAndFinancialLiabilitiesExplanatory" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfOffsettingOfFinancialAssetsAndFinancialLiabilitiesExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfOffsettingOfFinancialAssetsAndFinancialLiabilitiesExplanatory" xlink:to="lab_ifrs-full_DisclosureOfOffsettingOfFinancialAssetsAndFinancialLiabilitiesExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_NumberOfSharesAbstract_3f81c04a-6bc2-445f-8a8a-572073dbf6e0_terseLabel_en-US" xlink:label="lab_gmab_NumberOfSharesAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of shares</link:label>
    <link:label id="lab_gmab_NumberOfSharesAbstract_label_en-US" xlink:label="lab_gmab_NumberOfSharesAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number Of Shares [Abstract]</link:label>
    <link:label id="lab_gmab_NumberOfSharesAbstract_documentation_en-US" xlink:label="lab_gmab_NumberOfSharesAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">No definition available.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_NumberOfSharesAbstract" xlink:href="gmab-20251231.xsd#gmab_NumberOfSharesAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_NumberOfSharesAbstract" xlink:to="lab_gmab_NumberOfSharesAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ClassesOfIntangibleAssetsAndGoodwillAxis_49ca2805-9471-4eb2-8f1c-f5e60caf985d_terseLabel_en-US" xlink:label="lab_ifrs-full_ClassesOfIntangibleAssetsAndGoodwillAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Classes of intangible assets and goodwill [axis]</link:label>
    <link:label id="lab_ifrs-full_ClassesOfIntangibleAssetsAndGoodwillAxis_label_en-US" xlink:label="lab_ifrs-full_ClassesOfIntangibleAssetsAndGoodwillAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Classes of intangible assets and goodwill [axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfIntangibleAssetsAndGoodwillAxis" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfIntangibleAssetsAndGoodwillAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ClassesOfIntangibleAssetsAndGoodwillAxis" xlink:to="lab_ifrs-full_ClassesOfIntangibleAssetsAndGoodwillAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_NumberOfWarrantsExercisableInMoney_e8ef5416-4c3c-466b-bfbd-27c46845de45_periodEndLabel_en-US" xlink:label="lab_gmab_NumberOfWarrantsExercisableInMoney" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Exercisable warrants in the money at year end (in shares)</link:label>
    <link:label id="lab_gmab_NumberOfWarrantsExercisableInMoney_label_en-US" xlink:label="lab_gmab_NumberOfWarrantsExercisableInMoney" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number Of Warrants Exercisable In The Money</link:label>
    <link:label id="lab_gmab_NumberOfWarrantsExercisableInMoney_documentation_en-US" xlink:label="lab_gmab_NumberOfWarrantsExercisableInMoney" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Number of exercisable warrants in the money at year end.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_NumberOfWarrantsExercisableInMoney" xlink:href="gmab-20251231.xsd#gmab_NumberOfWarrantsExercisableInMoney"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_NumberOfWarrantsExercisableInMoney" xlink:to="lab_gmab_NumberOfWarrantsExercisableInMoney" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillExplanatory_1f3e8f02-bf75-47f2-8bd0-6cc03f7d4ec4_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of intangible assets</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of reconciliation of changes in intangible assets and goodwill [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillExplanatory" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillExplanatory" xlink:to="lab_ifrs-full_DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_EmployeesMember_36fc98a6-6fa9-4b44-92cb-2da27c730346_terseLabel_en-US" xlink:label="lab_gmab_EmployeesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Employees</link:label>
    <link:label id="lab_gmab_EmployeesMember_label_en-US" xlink:label="lab_gmab_EmployeesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Employees [Member]</link:label>
    <link:label id="lab_gmab_EmployeesMember_documentation_en-US" xlink:label="lab_gmab_EmployeesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents information pertaining to Employees.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_EmployeesMember" xlink:href="gmab-20251231.xsd#gmab_EmployeesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_EmployeesMember" xlink:to="lab_gmab_EmployeesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_currency_AllCurrenciesDomain_9d0509ce-72ec-41be-855d-39708133b592_terseLabel_en-US" xlink:label="lab_currency_AllCurrenciesDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">All Currencies [Domain]</link:label>
    <link:label id="lab_currency_AllCurrenciesDomain_label_en-US" xlink:label="lab_currency_AllCurrenciesDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">All Currencies [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_currency_AllCurrenciesDomain" xlink:href="https://xbrl.sec.gov/currency/2025/currency-2025.xsd#currency_AllCurrenciesDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_currency_AllCurrenciesDomain" xlink:to="lab_currency_AllCurrenciesDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersTable_1bb363a3-2f6b-42a3-8bbd-693bf6082e0d_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure of disaggregation of revenue from contracts with customers [table]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersTable_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of disaggregation of revenue from contracts with customers [table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersTable" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersTable" xlink:to="lab_ifrs-full_DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersTable" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_CurrentContractLiabilitiesRecognisedAsOfAcquisitionDate_019c08be-a39d-76c8-b95a-41847f3af8fa_negatedTerseLabel_en-US" xlink:label="lab_gmab_CurrentContractLiabilitiesRecognisedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Current contract liabilities</link:label>
    <link:label id="lab_gmab_CurrentContractLiabilitiesRecognisedAsOfAcquisitionDate_label_en-US" xlink:label="lab_gmab_CurrentContractLiabilitiesRecognisedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Current Contract Liabilities Recognised As Of Acquisition Date</link:label>
    <link:label id="lab_gmab_CurrentContractLiabilitiesRecognisedAsOfAcquisitionDate_documentation_en-US" xlink:label="lab_gmab_CurrentContractLiabilitiesRecognisedAsOfAcquisitionDate" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Current Contract Liabilities Recognised As Of Acquisition Date</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_CurrentContractLiabilitiesRecognisedAsOfAcquisitionDate" xlink:href="gmab-20251231.xsd#gmab_CurrentContractLiabilitiesRecognisedAsOfAcquisitionDate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_CurrentContractLiabilitiesRecognisedAsOfAcquisitionDate" xlink:to="lab_gmab_CurrentContractLiabilitiesRecognisedAsOfAcquisitionDate" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_DescriptionOfAccountingPolicyForAssetsAcquisitionsPolicyTextBlock_019bbc80-0161-7f88-9e5c-74331136c842_terseLabel_en-US" xlink:label="lab_gmab_DescriptionOfAccountingPolicyForAssetsAcquisitionsPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Asset Acquisitions</link:label>
    <link:label id="lab_gmab_DescriptionOfAccountingPolicyForAssetsAcquisitionsPolicyTextBlock_label_en-US" xlink:label="lab_gmab_DescriptionOfAccountingPolicyForAssetsAcquisitionsPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Description Of Accounting Policy For Assets Acquisitions [Policy Text Block]</link:label>
    <link:label id="lab_gmab_DescriptionOfAccountingPolicyForAssetsAcquisitionsPolicyTextBlock_documentation_en-US" xlink:label="lab_gmab_DescriptionOfAccountingPolicyForAssetsAcquisitionsPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Description Of Accounting Policy For Assets Acquisitions</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_DescriptionOfAccountingPolicyForAssetsAcquisitionsPolicyTextBlock" xlink:href="gmab-20251231.xsd#gmab_DescriptionOfAccountingPolicyForAssetsAcquisitionsPolicyTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_DescriptionOfAccountingPolicyForAssetsAcquisitionsPolicyTextBlock" xlink:to="lab_gmab_DescriptionOfAccountingPolicyForAssetsAcquisitionsPolicyTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfReclassificationsOrChangesInPresentationTable_019b07d0-407c-7c6b-952e-09ebe9832074_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfReclassificationsOrChangesInPresentationTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure of reclassifications or changes in presentation [table]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfReclassificationsOrChangesInPresentationTable_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfReclassificationsOrChangesInPresentationTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of reclassifications or changes in presentation [table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfReclassificationsOrChangesInPresentationTable" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfReclassificationsOrChangesInPresentationTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfReclassificationsOrChangesInPresentationTable" xlink:to="lab_ifrs-full_DisclosureOfReclassificationsOrChangesInPresentationTable" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_IcfrAuditorAttestationFlag_019b45b2-7fd4-7bce-9805-da879e3b515c_terseLabel_en-US" xlink:label="lab_dei_IcfrAuditorAttestationFlag" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">ICFR Auditor Attestation Flag</link:label>
    <link:label id="lab_dei_IcfrAuditorAttestationFlag_label_en-US" xlink:label="lab_dei_IcfrAuditorAttestationFlag" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">ICFR Auditor Attestation Flag</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_IcfrAuditorAttestationFlag" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_IcfrAuditorAttestationFlag"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_IcfrAuditorAttestationFlag" xlink:to="lab_dei_IcfrAuditorAttestationFlag" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_DisclosureOfDetailedInformationAboutChangesInPresentationCurrencyTableTextBlock_539dd24e-febe-405d-b9dc-3114d55fc3a3_terseLabel_en-US" xlink:label="lab_gmab_DisclosureOfDetailedInformationAboutChangesInPresentationCurrencyTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure of detailed information about changes in presentation currency</link:label>
    <link:label id="lab_gmab_DisclosureOfDetailedInformationAboutChangesInPresentationCurrencyTableTextBlock_label_en-US" xlink:label="lab_gmab_DisclosureOfDetailedInformationAboutChangesInPresentationCurrencyTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure Of Detailed Information About Changes in Presentation Currency [Table Text Block]</link:label>
    <link:label id="lab_gmab_DisclosureOfDetailedInformationAboutChangesInPresentationCurrencyTableTextBlock_documentation_en-US" xlink:label="lab_gmab_DisclosureOfDetailedInformationAboutChangesInPresentationCurrencyTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Disclosure Of Detailed Information About Changes in Presentation Currency</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_DisclosureOfDetailedInformationAboutChangesInPresentationCurrencyTableTextBlock" xlink:href="gmab-20251231.xsd#gmab_DisclosureOfDetailedInformationAboutChangesInPresentationCurrencyTableTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_DisclosureOfDetailedInformationAboutChangesInPresentationCurrencyTableTextBlock" xlink:to="lab_gmab_DisclosureOfDetailedInformationAboutChangesInPresentationCurrencyTableTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_PernilleErenbjergMember_2d32e7be-a2a3-43d9-b7a6-eab9a7ccf4a9_terseLabel_en-US" xlink:label="lab_gmab_PernilleErenbjergMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Pernille Erenbjerg</link:label>
    <link:label id="lab_gmab_PernilleErenbjergMember_label_en-US" xlink:label="lab_gmab_PernilleErenbjergMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Pernille Erenbjerg [Member]</link:label>
    <link:label id="lab_gmab_PernilleErenbjergMember_documentation_en-US" xlink:label="lab_gmab_PernilleErenbjergMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents information pertaining to Pernille Erenbjerg.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_PernilleErenbjergMember" xlink:href="gmab-20251231.xsd#gmab_PernilleErenbjergMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_PernilleErenbjergMember" xlink:to="lab_gmab_PernilleErenbjergMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable_273541c1-a3c2-4084-9be7-baf54eac81e3_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure of temporary difference, unused tax losses and unused tax credits [table]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of temporary difference, unused tax losses and unused tax credits [table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable" xlink:to="lab_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CashOutflowForLeases_f889f391-97f3-428b-872b-e390a8080c22_terseLabel_en-US" xlink:label="lab_ifrs-full_CashOutflowForLeases" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash outflow for lease payments</link:label>
    <link:label id="lab_ifrs-full_CashOutflowForLeases_label_en-US" xlink:label="lab_ifrs-full_CashOutflowForLeases" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash outflow for leases</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashOutflowForLeases" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CashOutflowForLeases"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CashOutflowForLeases" xlink:to="lab_ifrs-full_CashOutflowForLeases" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_SocialSecurityContributions_6dd6c72a-6feb-4154-be4d-6a465451643d_terseLabel_en-US" xlink:label="lab_ifrs-full_SocialSecurityContributions" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other social security costs</link:label>
    <link:label id="lab_ifrs-full_SocialSecurityContributions_label_en-US" xlink:label="lab_ifrs-full_SocialSecurityContributions" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Social security contributions</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SocialSecurityContributions" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SocialSecurityContributions"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_SocialSecurityContributions" xlink:to="lab_ifrs-full_SocialSecurityContributions" xlink:type="arc" order="1"/>
    <link:label id="lab_srt_LitigationCaseAxis_019b2244-6522-7ca7-8f33-3a0eae722d72_terseLabel_en-US" xlink:label="lab_srt_LitigationCaseAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Litigation Case [Axis]</link:label>
    <link:label id="lab_srt_LitigationCaseAxis_label_en-US" xlink:label="lab_srt_LitigationCaseAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Litigation Case [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseAxis" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_LitigationCaseAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_LitigationCaseAxis" xlink:to="lab_srt_LitigationCaseAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_NumberOfWarrantsTransferred_019c65bf-1347-77bf-beb8-2067e9bbae24_negatedTerseLabel_en-US" xlink:label="lab_gmab_NumberOfWarrantsTransferred" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Transfers (in shares)</link:label>
    <link:label id="lab_gmab_NumberOfWarrantsTransferred_label_en-US" xlink:label="lab_gmab_NumberOfWarrantsTransferred" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number Of Warrants Transferred</link:label>
    <link:label id="lab_gmab_NumberOfWarrantsTransferred_documentation_en-US" xlink:label="lab_gmab_NumberOfWarrantsTransferred" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Number of warrants Transferred.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_NumberOfWarrantsTransferred" xlink:href="gmab-20251231.xsd#gmab_NumberOfWarrantsTransferred"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_NumberOfWarrantsTransferred" xlink:to="lab_gmab_NumberOfWarrantsTransferred" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AdjustmentsForAmortisationExpense_692ef74d-8c54-4b43-bfe6-99e4aecf11ad_terseLabel_en-US" xlink:label="lab_ifrs-full_AdjustmentsForAmortisationExpense" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Amortization</link:label>
    <link:label id="lab_ifrs-full_AdjustmentsForAmortisationExpense_label_en-US" xlink:label="lab_ifrs-full_AdjustmentsForAmortisationExpense" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Adjustments for amortisation expense</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForAmortisationExpense" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AdjustmentsForAmortisationExpense"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AdjustmentsForAmortisationExpense" xlink:to="lab_ifrs-full_AdjustmentsForAmortisationExpense" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_AuditorFirmId_c215f774-6cd7-490e-bdea-6917d3d898de_terseLabel_en-US" xlink:label="lab_dei_AuditorFirmId" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Auditor Firm ID</link:label>
    <link:label id="lab_dei_AuditorFirmId_label_en-US" xlink:label="lab_dei_AuditorFirmId" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Auditor Firm ID</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AuditorFirmId" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AuditorFirmId"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_AuditorFirmId" xlink:to="lab_dei_AuditorFirmId" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_KeyManagementPersonnelCompensationPostemploymentBenefits_f769aad7-58d2-460b-8aad-e07d7f06f01d_terseLabel_en-US" xlink:label="lab_ifrs-full_KeyManagementPersonnelCompensationPostemploymentBenefits" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share-based compensation expenses</link:label>
    <link:label id="lab_ifrs-full_KeyManagementPersonnelCompensationPostemploymentBenefits_label_en-US" xlink:label="lab_ifrs-full_KeyManagementPersonnelCompensationPostemploymentBenefits" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Key management personnel compensation, post-employment benefits</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_KeyManagementPersonnelCompensationPostemploymentBenefits" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_KeyManagementPersonnelCompensationPostemploymentBenefits"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_KeyManagementPersonnelCompensationPostemploymentBenefits" xlink:to="lab_ifrs-full_KeyManagementPersonnelCompensationPostemploymentBenefits" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_PaymentsToAcquireTreasuryShares_4fe655a5-9533-4726-b302-a16f386a6c7b_negatedLabel_en-US" xlink:label="lab_gmab_PaymentsToAcquireTreasuryShares" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Purchase of treasury shares</link:label>
    <link:label id="lab_gmab_PaymentsToAcquireTreasuryShares_label_en-US" xlink:label="lab_gmab_PaymentsToAcquireTreasuryShares" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments To Acquire Treasury Shares</link:label>
    <link:label id="lab_gmab_PaymentsToAcquireTreasuryShares_documentation_en-US" xlink:label="lab_gmab_PaymentsToAcquireTreasuryShares" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The cash outflow to acquire treasury shares.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_PaymentsToAcquireTreasuryShares" xlink:href="gmab-20251231.xsd#gmab_PaymentsToAcquireTreasuryShares"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_PaymentsToAcquireTreasuryShares" xlink:to="lab_gmab_PaymentsToAcquireTreasuryShares" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_SharePremiumMember_75485a7e-de1f-421a-b93d-d532e73fb9fa_terseLabel_en-US" xlink:label="lab_ifrs-full_SharePremiumMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share premium</link:label>
    <link:label id="lab_ifrs-full_SharePremiumMember_label_en-US" xlink:label="lab_ifrs-full_SharePremiumMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share premium [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SharePremiumMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SharePremiumMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_SharePremiumMember" xlink:to="lab_ifrs-full_SharePremiumMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersExplanatory_54937e84-1add-4e60-8b0e-64ebb711affd_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of revenue by type, collaboration partner, and product under agreements.</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of disaggregation of revenue from contracts with customers [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersExplanatory" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersExplanatory" xlink:to="lab_ifrs-full_DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_FinancialAssetsPledgedAsCollateralForLiabilitiesOrContingentLiabilities_019c5632-9f3d-743c-927f-1eaa0bff7d82_terseLabel_en-US" xlink:label="lab_ifrs-full_FinancialAssetsPledgedAsCollateralForLiabilitiesOrContingentLiabilities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Financial assets pledged as collateral for liabilities or contingent liabilities</link:label>
    <link:label id="lab_ifrs-full_FinancialAssetsPledgedAsCollateralForLiabilitiesOrContingentLiabilities_label_en-US" xlink:label="lab_ifrs-full_FinancialAssetsPledgedAsCollateralForLiabilitiesOrContingentLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Financial assets pledged as collateral for liabilities or contingent liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialAssetsPledgedAsCollateralForLiabilitiesOrContingentLiabilities" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssetsPledgedAsCollateralForLiabilitiesOrContingentLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_FinancialAssetsPledgedAsCollateralForLiabilitiesOrContingentLiabilities" xlink:to="lab_ifrs-full_FinancialAssetsPledgedAsCollateralForLiabilitiesOrContingentLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_DevelopmentRegulatoryAndSalesMilestoneMember_2b28bb58-9b90-436e-a099-bd6664faa311_terseLabel_en-US" xlink:label="lab_gmab_DevelopmentRegulatoryAndSalesMilestoneMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Development Regulatory and Sales Milestone</link:label>
    <link:label id="lab_gmab_DevelopmentRegulatoryAndSalesMilestoneMember_label_en-US" xlink:label="lab_gmab_DevelopmentRegulatoryAndSalesMilestoneMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Development Regulatory and Sales Milestone [Member]</link:label>
    <link:label id="lab_gmab_DevelopmentRegulatoryAndSalesMilestoneMember_documentation_en-US" xlink:label="lab_gmab_DevelopmentRegulatoryAndSalesMilestoneMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the information pertaining to development, regulatory and sales milestone.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_DevelopmentRegulatoryAndSalesMilestoneMember" xlink:href="gmab-20251231.xsd#gmab_DevelopmentRegulatoryAndSalesMilestoneMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_DevelopmentRegulatoryAndSalesMilestoneMember" xlink:to="lab_gmab_DevelopmentRegulatoryAndSalesMilestoneMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfAmountsIncurredByEntityForProvisionOfKeyManagementPersonnelServicesProvidedBySeparateManagementEntitiesAbstract_786486e5-fb12-4751-bf0e-523242d41197_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfAmountsIncurredByEntityForProvisionOfKeyManagementPersonnelServicesProvidedBySeparateManagementEntitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Remuneration of the Board of Directors and Executive Management</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfAmountsIncurredByEntityForProvisionOfKeyManagementPersonnelServicesProvidedBySeparateManagementEntitiesAbstract_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfAmountsIncurredByEntityForProvisionOfKeyManagementPersonnelServicesProvidedBySeparateManagementEntitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of amounts incurred by entity for provision of key management personnel services provided by separate management entities [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfAmountsIncurredByEntityForProvisionOfKeyManagementPersonnelServicesProvidedBySeparateManagementEntitiesAbstract" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfAmountsIncurredByEntityForProvisionOfKeyManagementPersonnelServicesProvidedBySeparateManagementEntitiesAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfAmountsIncurredByEntityForProvisionOfKeyManagementPersonnelServicesProvidedBySeparateManagementEntitiesAbstract" xlink:to="lab_ifrs-full_DisclosureOfAmountsIncurredByEntityForProvisionOfKeyManagementPersonnelServicesProvidedBySeparateManagementEntitiesAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_PerformanceObligationsAxis_b53eae33-3086-4d9e-91aa-86870519afca_terseLabel_en-US" xlink:label="lab_ifrs-full_PerformanceObligationsAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Performance obligations [axis]</link:label>
    <link:label id="lab_ifrs-full_PerformanceObligationsAxis_label_en-US" xlink:label="lab_ifrs-full_PerformanceObligationsAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Performance obligations [axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PerformanceObligationsAxis" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PerformanceObligationsAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_PerformanceObligationsAxis" xlink:to="lab_ifrs-full_PerformanceObligationsAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_CountriesOutsideUnitedStatesAndJapanMember_ba893a48-f39e-44d9-8086-0b45610a8b42_terseLabel_en-US" xlink:label="lab_gmab_CountriesOutsideUnitedStatesAndJapanMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Countries outside United States and Japan</link:label>
    <link:label id="lab_gmab_CountriesOutsideUnitedStatesAndJapanMember_label_en-US" xlink:label="lab_gmab_CountriesOutsideUnitedStatesAndJapanMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Countries Outside United States and Japan [Member]</link:label>
    <link:label id="lab_gmab_CountriesOutsideUnitedStatesAndJapanMember_documentation_en-US" xlink:label="lab_gmab_CountriesOutsideUnitedStatesAndJapanMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the information pertaining to countries outside United States and Japan.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_CountriesOutsideUnitedStatesAndJapanMember" xlink:href="gmab-20251231.xsd#gmab_CountriesOutsideUnitedStatesAndJapanMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_CountriesOutsideUnitedStatesAndJapanMember" xlink:to="lab_gmab_CountriesOutsideUnitedStatesAndJapanMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_Liabilities_6428e124-ae5d-474c-81a9-d72262e525c1_totalLabel_en-US" xlink:label="lab_ifrs-full_Liabilities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total liabilities</link:label>
    <link:label id="lab_ifrs-full_Liabilities_3355afcf-6714-4166-9387-514cab843f38_terseLabel_en-US" xlink:label="lab_ifrs-full_Liabilities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total liabilities</link:label>
    <link:label id="lab_ifrs-full_Liabilities_label_en-US" xlink:label="lab_ifrs-full_Liabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Liabilities" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Liabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_Liabilities" xlink:to="lab_ifrs-full_Liabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_StaffCostsIncludedInSellingGeneralAndAdministrativeExpenses_6b2e1f1b-f203-40e4-97c6-f804dbff0e3e_terseLabel_en-US" xlink:label="lab_gmab_StaffCostsIncludedInSellingGeneralAndAdministrativeExpenses" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Selling, general and administrative expenses</link:label>
    <link:label id="lab_gmab_StaffCostsIncludedInSellingGeneralAndAdministrativeExpenses_label_en-US" xlink:label="lab_gmab_StaffCostsIncludedInSellingGeneralAndAdministrativeExpenses" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Staff Costs Included In Selling, General and Administrative Expenses</link:label>
    <link:label id="lab_gmab_StaffCostsIncludedInSellingGeneralAndAdministrativeExpenses_documentation_en-US" xlink:label="lab_gmab_StaffCostsIncludedInSellingGeneralAndAdministrativeExpenses" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The amount of staff cost included in selling, general and administrative expenses.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_StaffCostsIncludedInSellingGeneralAndAdministrativeExpenses" xlink:href="gmab-20251231.xsd#gmab_StaffCostsIncludedInSellingGeneralAndAdministrativeExpenses"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_StaffCostsIncludedInSellingGeneralAndAdministrativeExpenses" xlink:to="lab_gmab_StaffCostsIncludedInSellingGeneralAndAdministrativeExpenses" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForGovernmentGrants_019bbbcf-0771-7df6-ae96-85fa90865bd4_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForGovernmentGrants" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Government Grants</link:label>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForGovernmentGrants_label_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForGovernmentGrants" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Description of accounting policy for government grants [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForGovernmentGrants" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DescriptionOfAccountingPolicyForGovernmentGrants"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DescriptionOfAccountingPolicyForGovernmentGrants" xlink:to="lab_ifrs-full_DescriptionOfAccountingPolicyForGovernmentGrants" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_NumberOfSharesAuthorizedToBeRepurchased_30c5f53c-dfbc-4249-8c6b-f9d38383c873_terseLabel_en-US" xlink:label="lab_gmab_NumberOfSharesAuthorizedToBeRepurchased" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of shares authorized for repurchase (in shares)</link:label>
    <link:label id="lab_gmab_NumberOfSharesAuthorizedToBeRepurchased_label_en-US" xlink:label="lab_gmab_NumberOfSharesAuthorizedToBeRepurchased" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number Of Shares Authorized To Be Repurchased</link:label>
    <link:label id="lab_gmab_NumberOfSharesAuthorizedToBeRepurchased_documentation_en-US" xlink:label="lab_gmab_NumberOfSharesAuthorizedToBeRepurchased" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_NumberOfSharesAuthorizedToBeRepurchased" xlink:href="gmab-20251231.xsd#gmab_NumberOfSharesAuthorizedToBeRepurchased"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_NumberOfSharesAuthorizedToBeRepurchased" xlink:to="lab_gmab_NumberOfSharesAuthorizedToBeRepurchased" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesTable_d3d43b67-ef1f-493f-9f45-cd9e3ecc1f4e_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure of subsidiaries [table]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesTable_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of subsidiaries [table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesTable" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesTable" xlink:to="lab_ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesTable" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CurrentTaxLiabilitiesCurrent_469aafab-acc4-4666-9fa0-818404e9e2f7_terseLabel_en-US" xlink:label="lab_ifrs-full_CurrentTaxLiabilitiesCurrent" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Corporate tax payable</link:label>
    <link:label id="lab_ifrs-full_CurrentTaxLiabilitiesCurrent_label_en-US" xlink:label="lab_ifrs-full_CurrentTaxLiabilitiesCurrent" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Current tax liabilities, current</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentTaxLiabilitiesCurrent" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CurrentTaxLiabilitiesCurrent"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CurrentTaxLiabilitiesCurrent" xlink:to="lab_ifrs-full_CurrentTaxLiabilitiesCurrent" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_StatementOfProfitOrLossAndOtherComprehensiveIncomeAbstract_label_en-US" xlink:label="lab_ifrs-full_StatementOfProfitOrLossAndOtherComprehensiveIncomeAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Statement of profit or loss and other comprehensive income [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_StatementOfProfitOrLossAndOtherComprehensiveIncomeAbstract" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_StatementOfProfitOrLossAndOtherComprehensiveIncomeAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_StatementOfProfitOrLossAndOtherComprehensiveIncomeAbstract" xlink:to="lab_ifrs-full_StatementOfProfitOrLossAndOtherComprehensiveIncomeAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DescriptionOfDiscountRatesAppliedToCashFlowProjections_019be50f-d6f5-759e-a797-4cfe1944bdb8_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfDiscountRatesAppliedToCashFlowProjections" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Discount rate applied to cash flow projections</link:label>
    <link:label id="lab_ifrs-full_DescriptionOfDiscountRatesAppliedToCashFlowProjections_label_en-US" xlink:label="lab_ifrs-full_DescriptionOfDiscountRatesAppliedToCashFlowProjections" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Discount rate applied to cash flow projections</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfDiscountRatesAppliedToCashFlowProjections" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DescriptionOfDiscountRatesAppliedToCashFlowProjections"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DescriptionOfDiscountRatesAppliedToCashFlowProjections" xlink:to="lab_ifrs-full_DescriptionOfDiscountRatesAppliedToCashFlowProjections" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesPropertyPlantAndEquipment_e5c697e9-7ecb-41a0-a6bc-a32d7c4e4bde_verboseLabel_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesPropertyPlantAndEquipment" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Exchange rate adjustment</link:label>
    <link:label id="lab_ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesPropertyPlantAndEquipment_label_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesPropertyPlantAndEquipment" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (decrease) through net exchange differences, property, plant and equipment</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesPropertyPlantAndEquipment" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesPropertyPlantAndEquipment"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesPropertyPlantAndEquipment" xlink:to="lab_ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesPropertyPlantAndEquipment" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_RetrospectiveApplicationAndRetrospectiveRestatementAxis_019b07e1-e368-7bb8-9716-a607708a200b_terseLabel_en-US" xlink:label="lab_ifrs-full_RetrospectiveApplicationAndRetrospectiveRestatementAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Retrospective application and retrospective restatement [axis]</link:label>
    <link:label id="lab_ifrs-full_RetrospectiveApplicationAndRetrospectiveRestatementAxis_label_en-US" xlink:label="lab_ifrs-full_RetrospectiveApplicationAndRetrospectiveRestatementAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Retrospective application and retrospective restatement [axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RetrospectiveApplicationAndRetrospectiveRestatementAxis" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RetrospectiveApplicationAndRetrospectiveRestatementAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_RetrospectiveApplicationAndRetrospectiveRestatementAxis" xlink:to="lab_ifrs-full_RetrospectiveApplicationAndRetrospectiveRestatementAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_LeaseLiabilitiesMember_2cec1deb-8293-4f31-be22-889d3f70ef1f_terseLabel_en-US" xlink:label="lab_ifrs-full_LeaseLiabilitiesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Lease liabilities</link:label>
    <link:label id="lab_ifrs-full_LeaseLiabilitiesMember_label_en-US" xlink:label="lab_ifrs-full_LeaseLiabilitiesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lease liabilities [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LeaseLiabilitiesMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LeaseLiabilitiesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_LeaseLiabilitiesMember" xlink:to="lab_ifrs-full_LeaseLiabilitiesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_ReceivableAmountRelatedToAdditionalDevelopmentRegulatoryAndSalesMilestonePayments_5acff1a7-3f8e-40f0-9263-4474c27e52e8_terseLabel_en-US" xlink:label="lab_gmab_ReceivableAmountRelatedToAdditionalDevelopmentRegulatoryAndSalesMilestonePayments" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Contractually entitled to receive amount in additional development, regulatory and sales milestone payments</link:label>
    <link:label id="lab_gmab_ReceivableAmountRelatedToAdditionalDevelopmentRegulatoryAndSalesMilestonePayments_label_en-US" xlink:label="lab_gmab_ReceivableAmountRelatedToAdditionalDevelopmentRegulatoryAndSalesMilestonePayments" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Receivable Amount Related to Additional Development, Regulatory and Sales Milestone Payments</link:label>
    <link:label id="lab_gmab_ReceivableAmountRelatedToAdditionalDevelopmentRegulatoryAndSalesMilestonePayments_documentation_en-US" xlink:label="lab_gmab_ReceivableAmountRelatedToAdditionalDevelopmentRegulatoryAndSalesMilestonePayments" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the contractually entitled to receive an aggregate payment, related to additional development, regulatory and sales milestone payments for all programs.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_ReceivableAmountRelatedToAdditionalDevelopmentRegulatoryAndSalesMilestonePayments" xlink:href="gmab-20251231.xsd#gmab_ReceivableAmountRelatedToAdditionalDevelopmentRegulatoryAndSalesMilestonePayments"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_ReceivableAmountRelatedToAdditionalDevelopmentRegulatoryAndSalesMilestonePayments" xlink:to="lab_gmab_ReceivableAmountRelatedToAdditionalDevelopmentRegulatoryAndSalesMilestonePayments" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CurrentTaxExpenseIncome_435fe839-8075-402c-9253-395665afeb87_verboseLabel_en-US" xlink:label="lab_ifrs-full_CurrentTaxExpenseIncome" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Current tax on profit</link:label>
    <link:label id="lab_ifrs-full_CurrentTaxExpenseIncome_label_en-US" xlink:label="lab_ifrs-full_CurrentTaxExpenseIncome" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Current tax expense (income)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentTaxExpenseIncome" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CurrentTaxExpenseIncome"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CurrentTaxExpenseIncome" xlink:to="lab_ifrs-full_CurrentTaxExpenseIncome" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_TermLoanBSecuredMember_019b27cb-f112-75b0-8114-962e45968133_terseLabel_en-US" xlink:label="lab_gmab_TermLoanBSecuredMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Term Loan B (Secured)</link:label>
    <link:label id="lab_gmab_TermLoanBSecuredMember_label_en-US" xlink:label="lab_gmab_TermLoanBSecuredMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Term Loan B (Secured) [Member]</link:label>
    <link:label id="lab_gmab_TermLoanBSecuredMember_documentation_en-US" xlink:label="lab_gmab_TermLoanBSecuredMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Term Loan B (Secured)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_TermLoanBSecuredMember" xlink:href="gmab-20251231.xsd#gmab_TermLoanBSecuredMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_TermLoanBSecuredMember" xlink:to="lab_gmab_TermLoanBSecuredMember" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_DisclosureOfStaffCostTableTextBlock_5ea7b3b5-9018-4326-8335-880da33a8cfc_terseLabel_en-US" xlink:label="lab_gmab_DisclosureOfStaffCostTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of staff costs</link:label>
    <link:label id="lab_gmab_DisclosureOfStaffCostTableTextBlock_label_en-US" xlink:label="lab_gmab_DisclosureOfStaffCostTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure Of Staff Cost [Table Text Block]</link:label>
    <link:label id="lab_gmab_DisclosureOfStaffCostTableTextBlock_documentation_en-US" xlink:label="lab_gmab_DisclosureOfStaffCostTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Disclosure of staff cost.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_DisclosureOfStaffCostTableTextBlock" xlink:href="gmab-20251231.xsd#gmab_DisclosureOfStaffCostTableTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_DisclosureOfStaffCostTableTextBlock" xlink:to="lab_gmab_DisclosureOfStaffCostTableTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_TripleARatingMember_b4e84fcd-5544-4cd4-ba4e-2e7342f98e1f_terseLabel_en-US" xlink:label="lab_gmab_TripleARatingMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Triple A-rating</link:label>
    <link:label id="lab_gmab_TripleARatingMember_label_en-US" xlink:label="lab_gmab_TripleARatingMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Triple A-Rating [Member]</link:label>
    <link:label id="lab_gmab_TripleARatingMember_documentation_en-US" xlink:label="lab_gmab_TripleARatingMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This member stands for Triple A-rating.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_TripleARatingMember" xlink:href="gmab-20251231.xsd#gmab_TripleARatingMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_TripleARatingMember" xlink:to="lab_gmab_TripleARatingMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DescriptionOfInitialApplicationOfStandardsOrInterpretations_019c49a8-073d-7e02-b56f-497a1b39190a_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfInitialApplicationOfStandardsOrInterpretations" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">New Accounting Policies and Disclosure For 2025</link:label>
    <link:label id="lab_ifrs-full_DescriptionOfInitialApplicationOfStandardsOrInterpretations_label_en-US" xlink:label="lab_ifrs-full_DescriptionOfInitialApplicationOfStandardsOrInterpretations" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of initial application of standards or interpretations [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfInitialApplicationOfStandardsOrInterpretations" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DescriptionOfInitialApplicationOfStandardsOrInterpretations"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DescriptionOfInitialApplicationOfStandardsOrInterpretations" xlink:to="lab_ifrs-full_DescriptionOfInitialApplicationOfStandardsOrInterpretations" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_ProportionOfShareCapitalAbstract_a5b5c0a3-5f56-4894-8199-e1bf9e6cce04_terseLabel_en-US" xlink:label="lab_gmab_ProportionOfShareCapitalAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Proportion of share capital %</link:label>
    <link:label id="lab_gmab_ProportionOfShareCapitalAbstract_label_en-US" xlink:label="lab_gmab_ProportionOfShareCapitalAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proportion Of Share Capital [Abstract]</link:label>
    <link:label id="lab_gmab_ProportionOfShareCapitalAbstract_documentation_en-US" xlink:label="lab_gmab_ProportionOfShareCapitalAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">No definition available.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_ProportionOfShareCapitalAbstract" xlink:href="gmab-20251231.xsd#gmab_ProportionOfShareCapitalAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_ProportionOfShareCapitalAbstract" xlink:to="lab_gmab_ProportionOfShareCapitalAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_TopOfRangeMember_63a2e7cf-5a3e-46fa-abf9-81a3345a2246_terseLabel_en-US" xlink:label="lab_ifrs-full_TopOfRangeMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Top of range</link:label>
    <link:label id="lab_ifrs-full_TopOfRangeMember_label_en-US" xlink:label="lab_ifrs-full_TopOfRangeMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Top of range [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TopOfRangeMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TopOfRangeMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_TopOfRangeMember" xlink:to="lab_ifrs-full_TopOfRangeMember" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_GenmabB.v.Member_1aca9fee-6f19-435c-970a-e2560716382a_terseLabel_en-US" xlink:label="lab_gmab_GenmabB.v.Member" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Genmab B.V.</link:label>
    <link:label id="lab_gmab_GenmabB.v.Member_label_en-US" xlink:label="lab_gmab_GenmabB.v.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Genmab B.v. [Member]</link:label>
    <link:label id="lab_gmab_GenmabB.v.Member_documentation_en-US" xlink:label="lab_gmab_GenmabB.v.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This member stands for Genmab B.V.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_GenmabB.v.Member" xlink:href="gmab-20251231.xsd#gmab_GenmabB.v.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_GenmabB.v.Member" xlink:to="lab_gmab_GenmabB.v.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ResearchAndDevelopmentExpense_996c3b04-1e37-4cc4-a8fd-f7320e19d7ba_negatedLabel_en-US" xlink:label="lab_ifrs-full_ResearchAndDevelopmentExpense" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Research and development expenses</link:label>
    <link:label id="lab_ifrs-full_ResearchAndDevelopmentExpense_label_en-US" xlink:label="lab_ifrs-full_ResearchAndDevelopmentExpense" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Research and development expense</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ResearchAndDevelopmentExpense" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ResearchAndDevelopmentExpense"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ResearchAndDevelopmentExpense" xlink:to="lab_ifrs-full_ResearchAndDevelopmentExpense" xlink:type="arc" order="1"/>
    <link:label id="lab_srt_StatementScenarioAxis_f88ecd27-240d-409d-9003-b8cff2a06aca_terseLabel_en-US" xlink:label="lab_srt_StatementScenarioAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Scenario [Axis]</link:label>
    <link:label id="lab_srt_StatementScenarioAxis_label_en-US" xlink:label="lab_srt_StatementScenarioAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Scenario [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementScenarioAxis" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StatementScenarioAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_StatementScenarioAxis" xlink:to="lab_srt_StatementScenarioAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_ContingentCommitmentsAmount_09e05e60-8b23-4df1-ae33-d9d05b334178_terseLabel_en-US" xlink:label="lab_gmab_ContingentCommitmentsAmount" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Contingent commitments</link:label>
    <link:label id="lab_gmab_ContingentCommitmentsAmount_label_en-US" xlink:label="lab_gmab_ContingentCommitmentsAmount" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Contingent Commitments, Amount</link:label>
    <link:label id="lab_gmab_ContingentCommitmentsAmount_documentation_en-US" xlink:label="lab_gmab_ContingentCommitmentsAmount" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The contingent commitments relates to license and collaboration agreements.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_ContingentCommitmentsAmount" xlink:href="gmab-20251231.xsd#gmab_ContingentCommitmentsAmount"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_ContingentCommitmentsAmount" xlink:to="lab_gmab_ContingentCommitmentsAmount" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_LaterThanThreeYearsAndNotLaterThanFourYearsMember_c6cc7897-56ca-4bdb-ae21-c3f3ba3baeff_verboseLabel_en-US" xlink:label="lab_ifrs-full_LaterThanThreeYearsAndNotLaterThanFourYearsMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">2028</link:label>
    <link:label id="lab_ifrs-full_LaterThanThreeYearsAndNotLaterThanFourYearsMember_label_en-US" xlink:label="lab_ifrs-full_LaterThanThreeYearsAndNotLaterThanFourYearsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Later than three years and not later than four years [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LaterThanThreeYearsAndNotLaterThanFourYearsMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LaterThanThreeYearsAndNotLaterThanFourYearsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_LaterThanThreeYearsAndNotLaterThanFourYearsMember" xlink:to="lab_ifrs-full_LaterThanThreeYearsAndNotLaterThanFourYearsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_PaymentTerms_dad2b6e1-eb01-464b-8482-dce8fcee4732_terseLabel_en-US" xlink:label="lab_gmab_PaymentTerms" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Payment terms</link:label>
    <link:label id="lab_gmab_PaymentTerms_label_en-US" xlink:label="lab_gmab_PaymentTerms" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payment Terms</link:label>
    <link:label id="lab_gmab_PaymentTerms_documentation_en-US" xlink:label="lab_gmab_PaymentTerms" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The description of initial payment terms range.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_PaymentTerms" xlink:href="gmab-20251231.xsd#gmab_PaymentTerms"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_PaymentTerms" xlink:to="lab_gmab_PaymentTerms" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_TepezzaMember_67a8d9e2-ca3b-4b92-a861-c66418620237_terseLabel_en-US" xlink:label="lab_gmab_TepezzaMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">TEPEZZA</link:label>
    <link:label id="lab_gmab_TepezzaMember_label_en-US" xlink:label="lab_gmab_TepezzaMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">TEPEZZA [Member]</link:label>
    <link:label id="lab_gmab_TepezzaMember_documentation_en-US" xlink:label="lab_gmab_TepezzaMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This member stands for TEPEZZA.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_TepezzaMember" xlink:href="gmab-20251231.xsd#gmab_TepezzaMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_TepezzaMember" xlink:to="lab_gmab_TepezzaMember" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_CollaborativeArrangementAndArrangementOtherThanCollaborativeAxis_0591c2d9-9a6e-41c7-ae3d-4d9c79558711_terseLabel_en-US" xlink:label="lab_gmab_CollaborativeArrangementAndArrangementOtherThanCollaborativeAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Collaborative Arrangement and Arrangement Other Than Collaborative [Axis]</link:label>
    <link:label id="lab_gmab_CollaborativeArrangementAndArrangementOtherThanCollaborativeAxis_label_en-US" xlink:label="lab_gmab_CollaborativeArrangementAndArrangementOtherThanCollaborativeAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Collaborative Arrangement and Arrangement Other Than Collaborative [Axis]</link:label>
    <link:label id="lab_gmab_CollaborativeArrangementAndArrangementOtherThanCollaborativeAxis_documentation_en-US" xlink:label="lab_gmab_CollaborativeArrangementAndArrangementOtherThanCollaborativeAxis" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Information by collaborative arrangement and arrangement other than collaborative applicable to revenue-generating activity or operations.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_CollaborativeArrangementAndArrangementOtherThanCollaborativeAxis" xlink:href="gmab-20251231.xsd#gmab_CollaborativeArrangementAndArrangementOtherThanCollaborativeAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_CollaborativeArrangementAndArrangementOtherThanCollaborativeAxis" xlink:to="lab_gmab_CollaborativeArrangementAndArrangementOtherThanCollaborativeAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_InterestAndOtherFinancialIncome_85bba8e2-a314-400f-aece-5d70988fb971_terseLabel_en-US" xlink:label="lab_gmab_InterestAndOtherFinancialIncome" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Interest and other financial income</link:label>
    <link:label id="lab_gmab_InterestAndOtherFinancialIncome_label_en-US" xlink:label="lab_gmab_InterestAndOtherFinancialIncome" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Interest And Other Financial Income</link:label>
    <link:label id="lab_gmab_InterestAndOtherFinancialIncome_documentation_en-US" xlink:label="lab_gmab_InterestAndOtherFinancialIncome" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The interest and other financial income.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_InterestAndOtherFinancialIncome" xlink:href="gmab-20251231.xsd#gmab_InterestAndOtherFinancialIncome"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_InterestAndOtherFinancialIncome" xlink:to="lab_gmab_InterestAndOtherFinancialIncome" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForMeasuringInventories_019bbc22-12c5-7c48-91e8-35cfa677833b_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForMeasuringInventories" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Inventories</link:label>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForMeasuringInventories_label_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForMeasuringInventories" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Description of accounting policy for measuring inventories [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForMeasuringInventories" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DescriptionOfAccountingPolicyForMeasuringInventories"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DescriptionOfAccountingPolicyForMeasuringInventories" xlink:to="lab_ifrs-full_DescriptionOfAccountingPolicyForMeasuringInventories" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_ShareRepurchasePercentageOfPurchasePriceDeviationFromQuotedPrice_019b2cf7-9d51-76ec-8c0d-7344eeadbd98_terseLabel_en-US" xlink:label="lab_gmab_ShareRepurchasePercentageOfPurchasePriceDeviationFromQuotedPrice" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share repurchase, percentage of purchase price deviation from quoted price</link:label>
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    <link:label id="lab_gmab_ShareRepurchasePercentageOfPurchasePriceDeviationFromQuotedPrice_documentation_en-US" xlink:label="lab_gmab_ShareRepurchasePercentageOfPurchasePriceDeviationFromQuotedPrice" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Share Repurchase, Percentage Of Purchase Price Deviation From Quoted Price</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_ShareRepurchasePercentageOfPurchasePriceDeviationFromQuotedPrice" xlink:href="gmab-20251231.xsd#gmab_ShareRepurchasePercentageOfPurchasePriceDeviationFromQuotedPrice"/>
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    <link:label id="lab_gmab_DisclosureOfWarrantsActivityTableTextBlock_e6dc0a96-7b97-485b-ad7b-72a7f5e15438_terseLabel_en-US" xlink:label="lab_gmab_DisclosureOfWarrantsActivityTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Summary of warrants activity</link:label>
    <link:label id="lab_gmab_DisclosureOfWarrantsActivityTableTextBlock_label_en-US" xlink:label="lab_gmab_DisclosureOfWarrantsActivityTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure Of Warrants Activity [Table Text Block]</link:label>
    <link:label id="lab_gmab_DisclosureOfWarrantsActivityTableTextBlock_documentation_en-US" xlink:label="lab_gmab_DisclosureOfWarrantsActivityTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Tabular disclosure of warrants activity.</link:label>
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    <link:label id="lab_ifrs-full_NoncurrentAssetsOtherThanFinancialInstrumentsDeferredTaxAssetsPostemploymentBenefitAssetsAndRightsArisingUnderInsuranceContracts_e8317160-b2f4-4f55-a618-99c158d60e83_terseLabel_en-US" xlink:label="lab_ifrs-full_NoncurrentAssetsOtherThanFinancialInstrumentsDeferredTaxAssetsPostemploymentBenefitAssetsAndRightsArisingUnderInsuranceContracts" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Non-current assets</link:label>
    <link:label id="lab_ifrs-full_NoncurrentAssetsOtherThanFinancialInstrumentsDeferredTaxAssetsPostemploymentBenefitAssetsAndRightsArisingUnderInsuranceContracts_label_en-US" xlink:label="lab_ifrs-full_NoncurrentAssetsOtherThanFinancialInstrumentsDeferredTaxAssetsPostemploymentBenefitAssetsAndRightsArisingUnderInsuranceContracts" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Non-current assets other than financial instruments, deferred tax assets, post-employment benefit assets, and rights arising under insurance contracts</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentAssetsOtherThanFinancialInstrumentsDeferredTaxAssetsPostemploymentBenefitAssetsAndRightsArisingUnderInsuranceContracts" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NoncurrentAssetsOtherThanFinancialInstrumentsDeferredTaxAssetsPostemploymentBenefitAssetsAndRightsArisingUnderInsuranceContracts"/>
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    <link:label id="lab_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_4fdad210-ba5b-46fe-80bd-38a53294c827_terseLabel_en-US" xlink:label="lab_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis]</link:label>
    <link:label id="lab_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_label_en-US" xlink:label="lab_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis"/>
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    <link:label id="lab_gmab_ReductionOfIssuedCapitalAtCost_019c5103-ca87-7116-8251-004b78ad77b5_negatedTerseLabel_en-US" xlink:label="lab_gmab_ReductionOfIssuedCapitalAtCost" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Reduction in share capital</link:label>
    <link:label id="lab_gmab_ReductionOfIssuedCapitalAtCost_label_en-US" xlink:label="lab_gmab_ReductionOfIssuedCapitalAtCost" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Reduction Of Issued Capital, At Cost</link:label>
    <link:label id="lab_gmab_ReductionOfIssuedCapitalAtCost_documentation_en-US" xlink:label="lab_gmab_ReductionOfIssuedCapitalAtCost" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Reduction Of Issued Capital, At Cost</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_ReductionOfIssuedCapitalAtCost" xlink:href="gmab-20251231.xsd#gmab_ReductionOfIssuedCapitalAtCost"/>
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    <link:label id="lab_ifrs-full_BorrowingsByNameDomain_7aa4d66a-aa87-4608-9eaa-14ceff0348a0_terseLabel_en-US" xlink:label="lab_ifrs-full_BorrowingsByNameDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Borrowings by name [domain]</link:label>
    <link:label id="lab_ifrs-full_BorrowingsByNameDomain_label_en-US" xlink:label="lab_ifrs-full_BorrowingsByNameDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Borrowings by name [domain]</link:label>
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    <link:label id="lab_ifrs-full_CurrencyRiskMember_df01647c-156f-485d-8687-47c7ffdc5480_terseLabel_en-US" xlink:label="lab_ifrs-full_CurrencyRiskMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Currency risk</link:label>
    <link:label id="lab_ifrs-full_CurrencyRiskMember_label_en-US" xlink:label="lab_ifrs-full_CurrencyRiskMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Currency risk [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrencyRiskMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CurrencyRiskMember"/>
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    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForFunctionalCurrencyExplanatory_019bbbc0-143f-7300-970f-2f2a36aadc60_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForFunctionalCurrencyExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Functional and Presentation Currency Change</link:label>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForFunctionalCurrencyExplanatory_label_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForFunctionalCurrencyExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Description of accounting policy for functional currency [text block]</link:label>
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    <link:label id="lab_ifrs-full_DeferredTaxLiabilities_383f8303-8c43-490d-817f-b9159f495bcf_terseLabel_en-US" xlink:label="lab_ifrs-full_DeferredTaxLiabilities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Deferred tax liabilities</link:label>
    <link:label id="lab_ifrs-full_DeferredTaxLiabilities_label_en-US" xlink:label="lab_ifrs-full_DeferredTaxLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deferred tax liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DeferredTaxLiabilities" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DeferredTaxLiabilities"/>
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    <link:label id="lab_srt_StatementGeographicalAxis_019c4848-676d-7b5b-a726-3f11e82261c7_terseLabel_en-US" xlink:label="lab_srt_StatementGeographicalAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Geographical [Axis]</link:label>
    <link:label id="lab_srt_StatementGeographicalAxis_label_en-US" xlink:label="lab_srt_StatementGeographicalAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Geographical [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StatementGeographicalAxis"/>
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    <link:label id="lab_ifrs-full_OtherComprehensiveIncome_dbb14c2f-597b-4ec9-b392-679f4671f50d_terseLabel_en-US" xlink:label="lab_ifrs-full_OtherComprehensiveIncome" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other comprehensive income</link:label>
    <link:label id="lab_ifrs-full_OtherComprehensiveIncome_label_en-US" xlink:label="lab_ifrs-full_OtherComprehensiveIncome" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other comprehensive income</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherComprehensiveIncome" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherComprehensiveIncome"/>
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    <link:label id="lab_ifrs-full_TransfersOutOfLevel3OfFairValueHierarchyAssets_0238d173-6dc6-49d6-af15-f09b1c89c3b8_terseLabel_en-US" xlink:label="lab_ifrs-full_TransfersOutOfLevel3OfFairValueHierarchyAssets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Transfer into Level 3</link:label>
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    <link:label id="lab_ifrs-full_TreasurySharesMember_2452e69c-654e-4ef8-95bf-613c550f67dc_terseLabel_en-US" xlink:label="lab_ifrs-full_TreasurySharesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Treasury shares</link:label>
    <link:label id="lab_ifrs-full_TreasurySharesMember_label_en-US" xlink:label="lab_ifrs-full_TreasurySharesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Treasury shares [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TreasurySharesMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TreasurySharesMember"/>
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    <link:label id="lab_ifrs-full_IdentifiableAssetsAcquiredLiabilitiesAssumed_de001a18-6f93-4bac-990b-73a70bd146b2_totalLabel_en-US" xlink:label="lab_ifrs-full_IdentifiableAssetsAcquiredLiabilitiesAssumed" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total identifiable net assets</link:label>
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    <link:label id="lab_ifrs-full_IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges_618debdc-4fc1-4f16-ae4a-a6bc8badbf37_totalLabel_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Changes in cash and cash equivalents</link:label>
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    <link:label id="lab_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_a5c5e413-1108-498b-a158-eae503d55ec1_terseLabel_en-US" xlink:label="lab_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Types of share-based payment arrangements [axis]</link:label>
    <link:label id="lab_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_label_en-US" xlink:label="lab_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Types of share-based payment arrangements [axis]</link:label>
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    <link:label id="lab_gmab_DisclosureOfAmountsIncurredByEntityForProvisionOfKeyManagementPersonnelTableTextBlock_5e650ed5-29af-4cf2-87a6-9e9c0a84f55c_terseLabel_en-US" xlink:label="lab_gmab_DisclosureOfAmountsIncurredByEntityForProvisionOfKeyManagementPersonnelTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of remuneration to the Board of Directors</link:label>
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    <link:label id="lab_ifrs-full_InterestExpenseOnBorrowings_019c49b5-8719-7bb2-92e9-e19fc67b30fe_negatedTerseLabel_en-US" xlink:label="lab_ifrs-full_InterestExpenseOnBorrowings" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Interest expense on borrowings</link:label>
    <link:label id="lab_ifrs-full_InterestExpenseOnBorrowings_label_en-US" xlink:label="lab_ifrs-full_InterestExpenseOnBorrowings" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Interest expense on borrowings</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InterestExpenseOnBorrowings" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_InterestExpenseOnBorrowings"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_InterestExpenseOnBorrowings" xlink:to="lab_ifrs-full_InterestExpenseOnBorrowings" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_Security12bTitle_019b0cef-4d14-7a98-8c8e-bbf720a89751_terseLabel_en-US" xlink:label="lab_dei_Security12bTitle" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Title of 12(b) Security</link:label>
    <link:label id="lab_dei_Security12bTitle_label_en-US" xlink:label="lab_dei_Security12bTitle" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Title of 12(b) Security</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_Security12bTitle"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_Security12bTitle" xlink:to="lab_dei_Security12bTitle" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_NumberOfCashGeneratedUnits_019c5200-8780-75af-ad50-f93d6b22c66e_terseLabel_en-US" xlink:label="lab_gmab_NumberOfCashGeneratedUnits" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of CGU</link:label>
    <link:label id="lab_gmab_NumberOfCashGeneratedUnits_label_en-US" xlink:label="lab_gmab_NumberOfCashGeneratedUnits" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number Of Cash Generated Units</link:label>
    <link:label id="lab_gmab_NumberOfCashGeneratedUnits_documentation_en-US" xlink:label="lab_gmab_NumberOfCashGeneratedUnits" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Number Of Cash Generated Units</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_NumberOfCashGeneratedUnits" xlink:href="gmab-20251231.xsd#gmab_NumberOfCashGeneratedUnits"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_NumberOfCashGeneratedUnits" xlink:to="lab_gmab_NumberOfCashGeneratedUnits" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesLineItems_4f475b8e-269f-4787-b471-a523a4217afa_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure of subsidiaries [line items]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesLineItems_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of subsidiaries [line items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesLineItems" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesLineItems" xlink:to="lab_ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_DebtInstrumentTerm1_d4036f0a-b4a2-4f39-916f-9f11b7e3cbc0_terseLabel_en-US" xlink:label="lab_gmab_DebtInstrumentTerm1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unsecured revolving credit facility term</link:label>
    <link:label id="lab_gmab_DebtInstrumentTerm1_label_en-US" xlink:label="lab_gmab_DebtInstrumentTerm1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Term1</link:label>
    <link:label id="lab_gmab_DebtInstrumentTerm1_documentation_en-US" xlink:label="lab_gmab_DebtInstrumentTerm1" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_DebtInstrumentTerm1" xlink:href="gmab-20251231.xsd#gmab_DebtInstrumentTerm1"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_DebtInstrumentTerm1" xlink:to="lab_gmab_DebtInstrumentTerm1" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_BankBorrowingsUndiscountedCashFlows_019b27e7-7158-7b7a-bd91-3ecb48221f3e_terseLabel_en-US" xlink:label="lab_ifrs-full_BankBorrowingsUndiscountedCashFlows" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Bank borrowings, undiscounted cash flows</link:label>
    <link:label id="lab_ifrs-full_BankBorrowingsUndiscountedCashFlows_label_en-US" xlink:label="lab_ifrs-full_BankBorrowingsUndiscountedCashFlows" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Bank borrowings, undiscounted cash flows</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BankBorrowingsUndiscountedCashFlows" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BankBorrowingsUndiscountedCashFlows"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_BankBorrowingsUndiscountedCashFlows" xlink:to="lab_ifrs-full_BankBorrowingsUndiscountedCashFlows" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_NumberOfTreasurySharesCancelled_019c520c-0bfc-7b03-a8b3-3e4a2a5b509f_negatedLabel_en-US" xlink:label="lab_gmab_NumberOfTreasurySharesCancelled" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Share capital reduction (in shares)</link:label>
    <link:label id="lab_gmab_NumberOfTreasurySharesCancelled_019bc602-5734-7159-ba35-afc3b8788ab4_negatedTerseLabel_en-US" xlink:label="lab_gmab_NumberOfTreasurySharesCancelled" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Reduction in share capital (in shares)</link:label>
    <link:label id="lab_gmab_NumberOfTreasurySharesCancelled_019b2d0d-d3de-7736-aeb0-22a64cb06216_terseLabel_en-US" xlink:label="lab_gmab_NumberOfTreasurySharesCancelled" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of treasury shares cancelled (in shares)</link:label>
    <link:label id="lab_gmab_NumberOfTreasurySharesCancelled_label_en-US" xlink:label="lab_gmab_NumberOfTreasurySharesCancelled" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number Of Treasury Shares Cancelled</link:label>
    <link:label id="lab_gmab_NumberOfTreasurySharesCancelled_documentation_en-US" xlink:label="lab_gmab_NumberOfTreasurySharesCancelled" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Number Of Treasury Shares Cancelled</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_NumberOfTreasurySharesCancelled" xlink:href="gmab-20251231.xsd#gmab_NumberOfTreasurySharesCancelled"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_NumberOfTreasurySharesCancelled" xlink:to="lab_gmab_NumberOfTreasurySharesCancelled" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_EmployeeNoticePeriod_96b7e2a8-7659-4bf0-87c9-758617c394d9_terseLabel_en-US" xlink:label="lab_gmab_EmployeeNoticePeriod" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Employee notice period</link:label>
    <link:label id="lab_gmab_EmployeeNoticePeriod_label_en-US" xlink:label="lab_gmab_EmployeeNoticePeriod" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Employee Notice period</link:label>
    <link:label id="lab_gmab_EmployeeNoticePeriod_documentation_en-US" xlink:label="lab_gmab_EmployeeNoticePeriod" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The period for which employee service the notice for service.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_EmployeeNoticePeriod" xlink:href="gmab-20251231.xsd#gmab_EmployeeNoticePeriod"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_EmployeeNoticePeriod" xlink:to="lab_gmab_EmployeeNoticePeriod" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_AmountByWhichReceivablesRelatedCreditDerivativesOrSimilarInstrumentsMitigateMaximumExposureToCreditRisk_2ca77673-533a-4f2d-a6f6-3bc6b2ec7f3a_terseLabel_en-US" xlink:label="lab_gmab_AmountByWhichReceivablesRelatedCreditDerivativesOrSimilarInstrumentsMitigateMaximumExposureToCreditRisk" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Losses related to receivables and the credit risk on receivables is limited</link:label>
    <link:label id="lab_gmab_AmountByWhichReceivablesRelatedCreditDerivativesOrSimilarInstrumentsMitigateMaximumExposureToCreditRisk_label_en-US" xlink:label="lab_gmab_AmountByWhichReceivablesRelatedCreditDerivativesOrSimilarInstrumentsMitigateMaximumExposureToCreditRisk" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Amount By Which Receivables Related Credit Derivatives Or Similar Instruments Mitigate Maximum Exposure To Credit Risk</link:label>
    <link:label id="lab_gmab_AmountByWhichReceivablesRelatedCreditDerivativesOrSimilarInstrumentsMitigateMaximumExposureToCreditRisk_documentation_en-US" xlink:label="lab_gmab_AmountByWhichReceivablesRelatedCreditDerivativesOrSimilarInstrumentsMitigateMaximumExposureToCreditRisk" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The amount by which credit derivatives or similar instruments related to receivables mitigate maximum exposure to credit risk. [Refer: Loans and receivables.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_AmountByWhichReceivablesRelatedCreditDerivativesOrSimilarInstrumentsMitigateMaximumExposureToCreditRisk" xlink:href="gmab-20251231.xsd#gmab_AmountByWhichReceivablesRelatedCreditDerivativesOrSimilarInstrumentsMitigateMaximumExposureToCreditRisk"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_AmountByWhichReceivablesRelatedCreditDerivativesOrSimilarInstrumentsMitigateMaximumExposureToCreditRisk" xlink:to="lab_gmab_AmountByWhichReceivablesRelatedCreditDerivativesOrSimilarInstrumentsMitigateMaximumExposureToCreditRisk" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_CollaborationsAgreementUpfrontFeePaid_12098af5-ba62-42e1-88cd-5021f07a87c7_terseLabel_en-US" xlink:label="lab_gmab_CollaborationsAgreementUpfrontFeePaid" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Upfront fee paid</link:label>
    <link:label id="lab_gmab_CollaborationsAgreementUpfrontFeePaid_label_en-US" xlink:label="lab_gmab_CollaborationsAgreementUpfrontFeePaid" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Collaborations Agreement, Upfront Fee Paid</link:label>
    <link:label id="lab_gmab_CollaborationsAgreementUpfrontFeePaid_documentation_en-US" xlink:label="lab_gmab_CollaborationsAgreementUpfrontFeePaid" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The amount of upfront fee payment made under an collaboration agreement.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_CollaborationsAgreementUpfrontFeePaid" xlink:href="gmab-20251231.xsd#gmab_CollaborationsAgreementUpfrontFeePaid"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_CollaborationsAgreementUpfrontFeePaid" xlink:to="lab_gmab_CollaborationsAgreementUpfrontFeePaid" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_ExcessCashFlowPrepaymentScenarioAxis_019c5230-36ba-74a2-9581-537432467731_terseLabel_en-US" xlink:label="lab_gmab_ExcessCashFlowPrepaymentScenarioAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Excess Cash Flow Prepayment Scenario [Axis]</link:label>
    <link:label id="lab_gmab_ExcessCashFlowPrepaymentScenarioAxis_label_en-US" xlink:label="lab_gmab_ExcessCashFlowPrepaymentScenarioAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Excess Cash Flow Prepayment Scenario [Axis]</link:label>
    <link:label id="lab_gmab_ExcessCashFlowPrepaymentScenarioAxis_documentation_en-US" xlink:label="lab_gmab_ExcessCashFlowPrepaymentScenarioAxis" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Excess Cash Flow Prepayment Scenario</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_ExcessCashFlowPrepaymentScenarioAxis" xlink:href="gmab-20251231.xsd#gmab_ExcessCashFlowPrepaymentScenarioAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_ExcessCashFlowPrepaymentScenarioAxis" xlink:to="lab_gmab_ExcessCashFlowPrepaymentScenarioAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_NoncurrentReceivables_3b779426-cf6f-42f9-bb74-5055d1a5040d_terseLabel_en-US" xlink:label="lab_ifrs-full_NoncurrentReceivables" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Receivables</link:label>
    <link:label id="lab_ifrs-full_NoncurrentReceivables_86391495-5fe9-4c90-ba4f-d7ac45554776_verboseLabel_en-US" xlink:label="lab_ifrs-full_NoncurrentReceivables" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Non-current receivables</link:label>
    <link:label id="lab_ifrs-full_NoncurrentReceivables_label_en-US" xlink:label="lab_ifrs-full_NoncurrentReceivables" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Trade and other non-current receivables</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentReceivables" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NoncurrentReceivables"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_NoncurrentReceivables" xlink:to="lab_ifrs-full_NoncurrentReceivables" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AttributionOfExpensesByNatureToTheirFunctionDomain_019be51b-cc06-74ac-8e82-0fcf8d3beeb7_terseLabel_en-US" xlink:label="lab_ifrs-full_AttributionOfExpensesByNatureToTheirFunctionDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Attribution of expenses by nature to their function [domain]</link:label>
    <link:label id="lab_ifrs-full_AttributionOfExpensesByNatureToTheirFunctionDomain_label_en-US" xlink:label="lab_ifrs-full_AttributionOfExpensesByNatureToTheirFunctionDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Attribution of expenses by nature to their function [domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AttributionOfExpensesByNatureToTheirFunctionDomain" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AttributionOfExpensesByNatureToTheirFunctionDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AttributionOfExpensesByNatureToTheirFunctionDomain" xlink:to="lab_ifrs-full_AttributionOfExpensesByNatureToTheirFunctionDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForTreasurySharesExplanatory_019bbbd1-0720-7438-99e8-775147a5dcef_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForTreasurySharesExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Treasury Shares</link:label>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForTreasurySharesExplanatory_label_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForTreasurySharesExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Description of accounting policy for treasury shares [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForTreasurySharesExplanatory" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DescriptionOfAccountingPolicyForTreasurySharesExplanatory"/>
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    <link:label id="lab_gmab_WeightedAverageRiskFreeInterestRateWarrantsGranted_6227d0d4-16e1-4698-8c4e-d062ae93eb13_terseLabel_en-US" xlink:label="lab_gmab_WeightedAverageRiskFreeInterestRateWarrantsGranted" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Risk-free interest rate</link:label>
    <link:label id="lab_gmab_WeightedAverageRiskFreeInterestRateWarrantsGranted_label_en-US" xlink:label="lab_gmab_WeightedAverageRiskFreeInterestRateWarrantsGranted" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Weighted Average Risk Free Interest Rate, Warrants Granted</link:label>
    <link:label id="lab_gmab_WeightedAverageRiskFreeInterestRateWarrantsGranted_documentation_en-US" xlink:label="lab_gmab_WeightedAverageRiskFreeInterestRateWarrantsGranted" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Weighted average risk free interest rate of warrants granted.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_WeightedAverageRiskFreeInterestRateWarrantsGranted" xlink:href="gmab-20251231.xsd#gmab_WeightedAverageRiskFreeInterestRateWarrantsGranted"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_WeightedAverageRiskFreeInterestRateWarrantsGranted" xlink:to="lab_gmab_WeightedAverageRiskFreeInterestRateWarrantsGranted" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_e3570871-a6af-4485-a0ad-94fdac1cce5d_terseLabel_en-US" xlink:label="lab_ifrs-full_SignificantInvestmentsInSubsidiariesDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Subsidiaries [domain]</link:label>
    <link:label id="lab_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_label_en-US" xlink:label="lab_ifrs-full_SignificantInvestmentsInSubsidiariesDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Subsidiaries [domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SignificantInvestmentsInSubsidiariesDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain" xlink:to="lab_ifrs-full_SignificantInvestmentsInSubsidiariesDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities_019b078e-40a1-755d-9b2a-23b222bf7d06_negatedTerseLabel_en-US" xlink:label="lab_ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Debt issuance costs paid</link:label>
    <link:label id="lab_ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities_label_en-US" xlink:label="lab_ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Repayments of borrowings, classified as financing activities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities" xlink:to="lab_ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_NumberOfFullTimeEmployment_288d8a71-7def-4d04-ab4c-94214b230f7c_terseLabel_en-US" xlink:label="lab_gmab_NumberOfFullTimeEmployment" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of FTE at year-end</link:label>
    <link:label id="lab_gmab_NumberOfFullTimeEmployment_label_en-US" xlink:label="lab_gmab_NumberOfFullTimeEmployment" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number Of Full Time Employment</link:label>
    <link:label id="lab_gmab_NumberOfFullTimeEmployment_documentation_en-US" xlink:label="lab_gmab_NumberOfFullTimeEmployment" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Number of FTE at year-end.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_NumberOfFullTimeEmployment" xlink:href="gmab-20251231.xsd#gmab_NumberOfFullTimeEmployment"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_NumberOfFullTimeEmployment" xlink:to="lab_gmab_NumberOfFullTimeEmployment" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_BorrowingsByNameAxis_a7d78334-1b9a-4b46-b341-31c0f48ebb82_terseLabel_en-US" xlink:label="lab_ifrs-full_BorrowingsByNameAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Borrowings by name [axis]</link:label>
    <link:label id="lab_ifrs-full_BorrowingsByNameAxis_label_en-US" xlink:label="lab_ifrs-full_BorrowingsByNameAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Borrowings by name [axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BorrowingsByNameAxis" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BorrowingsByNameAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_BorrowingsByNameAxis" xlink:to="lab_ifrs-full_BorrowingsByNameAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_IfrsIncreaseDecreaseInOperatingCapitalAbstract_33d65654-707f-4002-a794-6c81d6f59bab_terseLabel_en-US" xlink:label="lab_gmab_IfrsIncreaseDecreaseInOperatingCapitalAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Change in operating assets and liabilities</link:label>
    <link:label id="lab_gmab_IfrsIncreaseDecreaseInOperatingCapitalAbstract_label_en-US" xlink:label="lab_gmab_IfrsIncreaseDecreaseInOperatingCapitalAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Ifrs Increase (Decrease) in Operating Capital [Abstract]</link:label>
    <link:label id="lab_gmab_IfrsIncreaseDecreaseInOperatingCapitalAbstract_documentation_en-US" xlink:label="lab_gmab_IfrsIncreaseDecreaseInOperatingCapitalAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">NA</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_IfrsIncreaseDecreaseInOperatingCapitalAbstract" xlink:href="gmab-20251231.xsd#gmab_IfrsIncreaseDecreaseInOperatingCapitalAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_IfrsIncreaseDecreaseInOperatingCapitalAbstract" xlink:to="lab_gmab_IfrsIncreaseDecreaseInOperatingCapitalAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfTradeAndOtherPayablesExplanatory_ad958bae-71ef-4f58-a266-3ee1fe4ca7f9_verboseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfTradeAndOtherPayablesExplanatory" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Schedule of other payables</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfTradeAndOtherPayablesExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfTradeAndOtherPayablesExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of trade and other payables [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfTradeAndOtherPayablesExplanatory" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfTradeAndOtherPayablesExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfTradeAndOtherPayablesExplanatory" xlink:to="lab_ifrs-full_DisclosureOfTradeAndOtherPayablesExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_KeyManagementPersonnelCompensationOtherLongtermBenefits_db114d34-d4ae-4dee-80e3-0403ecca4138_terseLabel_en-US" xlink:label="lab_ifrs-full_KeyManagementPersonnelCompensationOtherLongtermBenefits" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Defined Contribution Plans</link:label>
    <link:label id="lab_ifrs-full_KeyManagementPersonnelCompensationOtherLongtermBenefits_label_en-US" xlink:label="lab_ifrs-full_KeyManagementPersonnelCompensationOtherLongtermBenefits" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Key management personnel compensation, other long-term employee benefits</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_KeyManagementPersonnelCompensationOtherLongtermBenefits" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_KeyManagementPersonnelCompensationOtherLongtermBenefits"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_KeyManagementPersonnelCompensationOtherLongtermBenefits" xlink:to="lab_ifrs-full_KeyManagementPersonnelCompensationOtherLongtermBenefits" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_StaffCostsAreIncludedInIncomeStatementAsFollowsAbstract_4f9560ae-d106-4424-8792-32816e095711_terseLabel_en-US" xlink:label="lab_gmab_StaffCostsAreIncludedInIncomeStatementAsFollowsAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Staff costs are included in the income statement as follows:</link:label>
    <link:label id="lab_gmab_StaffCostsAreIncludedInIncomeStatementAsFollowsAbstract_label_en-US" xlink:label="lab_gmab_StaffCostsAreIncludedInIncomeStatementAsFollowsAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Staff Costs Are Included In Income Statement As Follows [Abstract]</link:label>
    <link:label id="lab_gmab_StaffCostsAreIncludedInIncomeStatementAsFollowsAbstract_documentation_en-US" xlink:label="lab_gmab_StaffCostsAreIncludedInIncomeStatementAsFollowsAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">No definition.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_StaffCostsAreIncludedInIncomeStatementAsFollowsAbstract" xlink:href="gmab-20251231.xsd#gmab_StaffCostsAreIncludedInIncomeStatementAsFollowsAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_StaffCostsAreIncludedInIncomeStatementAsFollowsAbstract" xlink:to="lab_gmab_StaffCostsAreIncludedInIncomeStatementAsFollowsAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_BioNTechMember_89be96f2-3dc5-4285-952b-ae6b5dca315f_terseLabel_en-US" xlink:label="lab_gmab_BioNTechMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">BioNTech</link:label>
    <link:label id="lab_gmab_BioNTechMember_label_en-US" xlink:label="lab_gmab_BioNTechMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">BioNTech [Member]</link:label>
    <link:label id="lab_gmab_BioNTechMember_documentation_en-US" xlink:label="lab_gmab_BioNTechMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This member stands for collaboration arrangements with BioNTech.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_BioNTechMember" xlink:href="gmab-20251231.xsd#gmab_BioNTechMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_BioNTechMember" xlink:to="lab_gmab_BioNTechMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForBorrowingsExplanatory_019bc722-52db-7b4c-bc3f-e8a92124a504_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForBorrowingsExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Borrowings</link:label>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForBorrowingsExplanatory_label_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForBorrowingsExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Description of accounting policy for borrowings [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForBorrowingsExplanatory" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DescriptionOfAccountingPolicyForBorrowingsExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DescriptionOfAccountingPolicyForBorrowingsExplanatory" xlink:to="lab_ifrs-full_DescriptionOfAccountingPolicyForBorrowingsExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AccumulatedImpairmentMember_04588b5d-f949-4fbd-9e70-752cc059d5b0_terseLabel_en-US" xlink:label="lab_ifrs-full_AccumulatedImpairmentMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Allowances at year end</link:label>
    <link:label id="lab_ifrs-full_AccumulatedImpairmentMember_label_en-US" xlink:label="lab_ifrs-full_AccumulatedImpairmentMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accumulated impairment [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AccumulatedImpairmentMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AccumulatedImpairmentMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AccumulatedImpairmentMember" xlink:to="lab_ifrs-full_AccumulatedImpairmentMember" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_LossesOnMarketableSecurities_019b082f-e448-7e30-ab2f-5a0fba38be4e_negatedTerseLabel_en-US" xlink:label="lab_gmab_LossesOnMarketableSecurities" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Loss on marketable securities</link:label>
    <link:label id="lab_gmab_LossesOnMarketableSecurities_326e48b3-3039-462c-aa80-0241f9369477_negatedLabel_en-US" xlink:label="lab_gmab_LossesOnMarketableSecurities" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Loss on marketable securities</link:label>
    <link:label id="lab_gmab_LossesOnMarketableSecurities_label_en-US" xlink:label="lab_gmab_LossesOnMarketableSecurities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Losses on Marketable Securities</link:label>
    <link:label id="lab_gmab_LossesOnMarketableSecurities_documentation_en-US" xlink:label="lab_gmab_LossesOnMarketableSecurities" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The losses on marketable securities.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_LossesOnMarketableSecurities" xlink:href="gmab-20251231.xsd#gmab_LossesOnMarketableSecurities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_LossesOnMarketableSecurities" xlink:to="lab_gmab_LossesOnMarketableSecurities" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfReservesAndOtherEquityInterestExplanatory_5d5b7e03-b2f5-4c55-ad21-248cd10f592e_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfReservesAndOtherEquityInterestExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of changes in share capital</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfReservesAndOtherEquityInterestExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfReservesAndOtherEquityInterestExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of reserves within equity [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfReservesAndOtherEquityInterestExplanatory" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfReservesAndOtherEquityInterestExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfReservesAndOtherEquityInterestExplanatory" xlink:to="lab_ifrs-full_DisclosureOfReservesAndOtherEquityInterestExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfDetailedInformationAboutPropertyPlantAndEquipmentExplanatory_06ef9662-2e5b-4dc7-8598-972efd7df4d2_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfDetailedInformationAboutPropertyPlantAndEquipmentExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of detailed information about property, plant and equipment</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfDetailedInformationAboutPropertyPlantAndEquipmentExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfDetailedInformationAboutPropertyPlantAndEquipmentExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of detailed information about property, plant and equipment [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfDetailedInformationAboutPropertyPlantAndEquipmentExplanatory" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfDetailedInformationAboutPropertyPlantAndEquipmentExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutPropertyPlantAndEquipmentExplanatory" xlink:to="lab_ifrs-full_DisclosureOfDetailedInformationAboutPropertyPlantAndEquipmentExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_OtherInvestmentMember_7d2c16bc-ead9-4151-a31f-04c6765aa682_terseLabel_en-US" xlink:label="lab_gmab_OtherInvestmentMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other investments</link:label>
    <link:label id="lab_gmab_OtherInvestmentMember_label_en-US" xlink:label="lab_gmab_OtherInvestmentMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Investment [Member]</link:label>
    <link:label id="lab_gmab_OtherInvestmentMember_documentation_en-US" xlink:label="lab_gmab_OtherInvestmentMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents information pertaining to other investments.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_OtherInvestmentMember" xlink:href="gmab-20251231.xsd#gmab_OtherInvestmentMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_OtherInvestmentMember" xlink:to="lab_gmab_OtherInvestmentMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ClassesOfIntangibleAssetsAndGoodwillDomain_54d594f9-676b-4e03-b4b0-52c2364fc4b1_terseLabel_en-US" xlink:label="lab_ifrs-full_ClassesOfIntangibleAssetsAndGoodwillDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Classes of intangible assets and goodwill [domain]</link:label>
    <link:label id="lab_ifrs-full_ClassesOfIntangibleAssetsAndGoodwillDomain_label_en-US" xlink:label="lab_ifrs-full_ClassesOfIntangibleAssetsAndGoodwillDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Classes of intangible assets and goodwill [domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfIntangibleAssetsAndGoodwillDomain" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfIntangibleAssetsAndGoodwillDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ClassesOfIntangibleAssetsAndGoodwillDomain" xlink:to="lab_ifrs-full_ClassesOfIntangibleAssetsAndGoodwillDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_BorrowingsInterestRate_019b27d4-9a14-7331-b338-b3c5f83a053b_terseLabel_en-US" xlink:label="lab_ifrs-full_BorrowingsInterestRate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Interest</link:label>
    <link:label id="lab_ifrs-full_BorrowingsInterestRate_label_en-US" xlink:label="lab_ifrs-full_BorrowingsInterestRate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Borrowings, interest rate</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BorrowingsInterestRate" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BorrowingsInterestRate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_BorrowingsInterestRate" xlink:to="lab_ifrs-full_BorrowingsInterestRate" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CashFlowsFromUsedInInvestingActivities_7c9c508d-ec3b-4fd5-bc7c-025d8def7d0f_totalLabel_en-US" xlink:label="lab_ifrs-full_CashFlowsFromUsedInInvestingActivities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net cash (used in) investing activities</link:label>
    <link:label id="lab_ifrs-full_CashFlowsFromUsedInInvestingActivities_019bbbb6-0f74-7e1b-a404-304ac7e33ecc_verboseLabel_en-US" xlink:label="lab_ifrs-full_CashFlowsFromUsedInInvestingActivities" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Investing activities</link:label>
    <link:label id="lab_ifrs-full_CashFlowsFromUsedInInvestingActivities_label_en-US" xlink:label="lab_ifrs-full_CashFlowsFromUsedInInvestingActivities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash flows from (used in) investing activities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInInvestingActivities" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CashFlowsFromUsedInInvestingActivities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CashFlowsFromUsedInInvestingActivities" xlink:to="lab_ifrs-full_CashFlowsFromUsedInInvestingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_NumberOfFutureDifferentiatedAntibodyTherapeuticsForCancer_2e8f5bd8-f0d8-4f44-a718-b20c267cc376_terseLabel_en-US" xlink:label="lab_gmab_NumberOfFutureDifferentiatedAntibodyTherapeuticsForCancer" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of future differentiated antibody for cancer to be discover</link:label>
    <link:label id="lab_gmab_NumberOfFutureDifferentiatedAntibodyTherapeuticsForCancer_label_en-US" xlink:label="lab_gmab_NumberOfFutureDifferentiatedAntibodyTherapeuticsForCancer" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number of Future Differentiated Antibody Therapeutics for Cancer</link:label>
    <link:label id="lab_gmab_NumberOfFutureDifferentiatedAntibodyTherapeuticsForCancer_documentation_en-US" xlink:label="lab_gmab_NumberOfFutureDifferentiatedAntibodyTherapeuticsForCancer" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Number of future differentiated antibody therapeutics for cancer to be discover under research collaboration.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_NumberOfFutureDifferentiatedAntibodyTherapeuticsForCancer" xlink:href="gmab-20251231.xsd#gmab_NumberOfFutureDifferentiatedAntibodyTherapeuticsForCancer"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_NumberOfFutureDifferentiatedAntibodyTherapeuticsForCancer" xlink:to="lab_gmab_NumberOfFutureDifferentiatedAntibodyTherapeuticsForCancer" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_CommercialPaper.Member_ce187cdc-794c-439b-b607-bfee8ff3c237_terseLabel_en-US" xlink:label="lab_gmab_CommercialPaper.Member" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Commercial paper</link:label>
    <link:label id="lab_gmab_CommercialPaper.Member_label_en-US" xlink:label="lab_gmab_CommercialPaper.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Commercial Paper. [Member]</link:label>
    <link:label id="lab_gmab_CommercialPaper.Member_documentation_en-US" xlink:label="lab_gmab_CommercialPaper.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Unsecured promissory note (generally negotiable) that provides institutions with short-term funds.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_CommercialPaper.Member" xlink:href="gmab-20251231.xsd#gmab_CommercialPaper.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_CommercialPaper.Member" xlink:to="lab_gmab_CommercialPaper.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_KesimptaMember_7531d97f-5093-47b0-8a69-81c1199e315e_terseLabel_en-US" xlink:label="lab_gmab_KesimptaMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Kesimpta</link:label>
    <link:label id="lab_gmab_KesimptaMember_label_en-US" xlink:label="lab_gmab_KesimptaMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Kesimpta [Member]</link:label>
    <link:label id="lab_gmab_KesimptaMember_documentation_en-US" xlink:label="lab_gmab_KesimptaMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This member stands for Kesimpta.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_KesimptaMember" xlink:href="gmab-20251231.xsd#gmab_KesimptaMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_KesimptaMember" xlink:to="lab_gmab_KesimptaMember" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_PercentageOfShareCapitalOnPurchaseOfTreasuryShares_2ce12143-957d-415b-892a-94103ff5037d_terseLabel_en-US" xlink:label="lab_gmab_PercentageOfShareCapitalOnPurchaseOfTreasuryShares" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Proportion of share capital on purchase of treasury shares (in %)</link:label>
    <link:label id="lab_gmab_PercentageOfShareCapitalOnPurchaseOfTreasuryShares_label_en-US" xlink:label="lab_gmab_PercentageOfShareCapitalOnPurchaseOfTreasuryShares" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Percentage Of Share Capital On Purchase Of Treasury Shares</link:label>
    <link:label id="lab_gmab_PercentageOfShareCapitalOnPurchaseOfTreasuryShares_documentation_en-US" xlink:label="lab_gmab_PercentageOfShareCapitalOnPurchaseOfTreasuryShares" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Percentage of proportion of share capital on purchase of treasury shares.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_PercentageOfShareCapitalOnPurchaseOfTreasuryShares" xlink:href="gmab-20251231.xsd#gmab_PercentageOfShareCapitalOnPurchaseOfTreasuryShares"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_PercentageOfShareCapitalOnPurchaseOfTreasuryShares" xlink:to="lab_gmab_PercentageOfShareCapitalOnPurchaseOfTreasuryShares" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_SellingGeneralAndAdministrativeExpensesOfAcquiree_5313ca54-3c51-487d-b311-f1255edc8747_terseLabel_en-US" xlink:label="lab_gmab_SellingGeneralAndAdministrativeExpensesOfAcquiree" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Selling, general and administrative expenses</link:label>
    <link:label id="lab_gmab_SellingGeneralAndAdministrativeExpensesOfAcquiree_label_en-US" xlink:label="lab_gmab_SellingGeneralAndAdministrativeExpensesOfAcquiree" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Selling, General And Administrative Expenses of Acquiree</link:label>
    <link:label id="lab_gmab_SellingGeneralAndAdministrativeExpensesOfAcquiree_documentation_en-US" xlink:label="lab_gmab_SellingGeneralAndAdministrativeExpensesOfAcquiree" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The amount of selling, general and administrative expenses of the acquiree since the acquisition date included in the consolidated statement of comprehensive income.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_SellingGeneralAndAdministrativeExpensesOfAcquiree" xlink:href="gmab-20251231.xsd#gmab_SellingGeneralAndAdministrativeExpensesOfAcquiree"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_SellingGeneralAndAdministrativeExpensesOfAcquiree" xlink:to="lab_gmab_SellingGeneralAndAdministrativeExpensesOfAcquiree" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfIntangibleAssetsLineItems_e4ce4819-5894-44bf-930b-208722fd1e7e_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfIntangibleAssetsLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure of detailed information about intangible assets [line items]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfIntangibleAssetsLineItems_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfIntangibleAssetsLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of detailed information about intangible assets [line items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfIntangibleAssetsLineItems" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfIntangibleAssetsLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfIntangibleAssetsLineItems" xlink:to="lab_ifrs-full_DisclosureOfIntangibleAssetsLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_DarzalexMember_887fb9c3-f424-4a95-aa81-cfdf225fc22f_terseLabel_en-US" xlink:label="lab_gmab_DarzalexMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">DARZALEX</link:label>
    <link:label id="lab_gmab_DarzalexMember_label_en-US" xlink:label="lab_gmab_DarzalexMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">DARZALEX [Member]</link:label>
    <link:label id="lab_gmab_DarzalexMember_documentation_en-US" xlink:label="lab_gmab_DarzalexMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This member stands for DARZALEX.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_DarzalexMember" xlink:href="gmab-20251231.xsd#gmab_DarzalexMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_DarzalexMember" xlink:to="lab_gmab_DarzalexMember" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_NonConvertibleDebtFinancingMember_019c578c-84dc-748c-bc7f-f6114f9abcb0_terseLabel_en-US" xlink:label="lab_gmab_NonConvertibleDebtFinancingMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Non-convertible debt financing</link:label>
    <link:label id="lab_gmab_NonConvertibleDebtFinancingMember_label_en-US" xlink:label="lab_gmab_NonConvertibleDebtFinancingMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Non-Convertible Debt Financing [Member]</link:label>
    <link:label id="lab_gmab_NonConvertibleDebtFinancingMember_documentation_en-US" xlink:label="lab_gmab_NonConvertibleDebtFinancingMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Non-Convertible Debt Financing</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_NonConvertibleDebtFinancingMember" xlink:href="gmab-20251231.xsd#gmab_NonConvertibleDebtFinancingMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_NonConvertibleDebtFinancingMember" xlink:to="lab_gmab_NonConvertibleDebtFinancingMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_EmployeeBenefitsExpense_1257d012-ecf4-45b0-968b-f6217f4b58a1_totalLabel_en-US" xlink:label="lab_ifrs-full_EmployeeBenefitsExpense" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total</link:label>
    <link:label id="lab_ifrs-full_EmployeeBenefitsExpense_label_en-US" xlink:label="lab_ifrs-full_EmployeeBenefitsExpense" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Employee benefits expense</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EmployeeBenefitsExpense" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_EmployeeBenefitsExpense"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_EmployeeBenefitsExpense" xlink:to="lab_ifrs-full_EmployeeBenefitsExpense" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_GenmabUsInc.Member_80c571ed-b377-4928-9e6c-72cc48d3907d_terseLabel_en-US" xlink:label="lab_gmab_GenmabUsInc.Member" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Genmab US,&#160;Inc.</link:label>
    <link:label id="lab_gmab_GenmabUsInc.Member_label_en-US" xlink:label="lab_gmab_GenmabUsInc.Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Genmab Us Inc. [Member]</link:label>
    <link:label id="lab_gmab_GenmabUsInc.Member_documentation_en-US" xlink:label="lab_gmab_GenmabUsInc.Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This member stands for Genmab US, Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_GenmabUsInc.Member" xlink:href="gmab-20251231.xsd#gmab_GenmabUsInc.Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_GenmabUsInc.Member" xlink:to="lab_gmab_GenmabUsInc.Member" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AmortisationIntangibleAssetsOtherThanGoodwill_9bf7a2b4-8009-4e6b-8d37-a6712779e1dc_terseLabel_en-US" xlink:label="lab_ifrs-full_AmortisationIntangibleAssetsOtherThanGoodwill" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Amortization for the year</link:label>
    <link:label id="lab_ifrs-full_AmortisationIntangibleAssetsOtherThanGoodwill_label_en-US" xlink:label="lab_ifrs-full_AmortisationIntangibleAssetsOtherThanGoodwill" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Amortisation, intangible assets other than goodwill</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AmortisationIntangibleAssetsOtherThanGoodwill" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AmortisationIntangibleAssetsOtherThanGoodwill"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AmortisationIntangibleAssetsOtherThanGoodwill" xlink:to="lab_ifrs-full_AmortisationIntangibleAssetsOtherThanGoodwill" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_IncreaseDecreaseInInterestExpense_019c0529-ef32-794f-b328-a7bfa42d74ea_terseLabel_en-US" xlink:label="lab_gmab_IncreaseDecreaseInInterestExpense" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Increase in interest expense</link:label>
    <link:label id="lab_gmab_IncreaseDecreaseInInterestExpense_label_en-US" xlink:label="lab_gmab_IncreaseDecreaseInInterestExpense" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) In Interest Expense</link:label>
    <link:label id="lab_gmab_IncreaseDecreaseInInterestExpense_documentation_en-US" xlink:label="lab_gmab_IncreaseDecreaseInInterestExpense" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Increase In Interest Expense</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_IncreaseDecreaseInInterestExpense" xlink:href="gmab-20251231.xsd#gmab_IncreaseDecreaseInInterestExpense"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_IncreaseDecreaseInInterestExpense" xlink:to="lab_gmab_IncreaseDecreaseInInterestExpense" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForFinancialInstrumentsExplanatory_019bbc21-44af-7d22-8ab4-e842149b0108_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForFinancialInstrumentsExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Financial instruments</link:label>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForFinancialInstrumentsExplanatory_label_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForFinancialInstrumentsExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Description of accounting policy for financial instruments [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForFinancialInstrumentsExplanatory" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DescriptionOfAccountingPolicyForFinancialInstrumentsExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DescriptionOfAccountingPolicyForFinancialInstrumentsExplanatory" xlink:to="lab_ifrs-full_DescriptionOfAccountingPolicyForFinancialInstrumentsExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CurrentAssets_cf87fdb3-336a-4065-ae0c-b723fa316fb8_totalLabel_en-US" xlink:label="lab_ifrs-full_CurrentAssets" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total current assets</link:label>
    <link:label id="lab_ifrs-full_CurrentAssets_label_en-US" xlink:label="lab_ifrs-full_CurrentAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Current assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentAssets" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CurrentAssets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CurrentAssets" xlink:to="lab_ifrs-full_CurrentAssets" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_NumberOfProductConceptsToBeIdentifiedToResearchAndDevelopment_019bc5ed-feb8-7168-9e69-2862710ae3c8_terseLabel_en-US" xlink:label="lab_gmab_NumberOfProductConceptsToBeIdentifiedToResearchAndDevelopment" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of product concepts</link:label>
    <link:label id="lab_gmab_NumberOfProductConceptsToBeIdentifiedToResearchAndDevelopment_label_en-US" xlink:label="lab_gmab_NumberOfProductConceptsToBeIdentifiedToResearchAndDevelopment" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number Of Product Concepts To Be Identified To Research And Development</link:label>
    <link:label id="lab_gmab_NumberOfProductConceptsToBeIdentifiedToResearchAndDevelopment_documentation_en-US" xlink:label="lab_gmab_NumberOfProductConceptsToBeIdentifiedToResearchAndDevelopment" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Number Of Product Concepts To Be Identified To Research And Development</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_NumberOfProductConceptsToBeIdentifiedToResearchAndDevelopment" xlink:href="gmab-20251231.xsd#gmab_NumberOfProductConceptsToBeIdentifiedToResearchAndDevelopment"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_NumberOfProductConceptsToBeIdentifiedToResearchAndDevelopment" xlink:to="lab_gmab_NumberOfProductConceptsToBeIdentifiedToResearchAndDevelopment" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DeferredTaxExpenseIncomeRecognisedInProfitOrLoss_019c4801-28c1-7c8d-986a-ed6e14f8eb39_terseLabel_en-US" xlink:label="lab_ifrs-full_DeferredTaxExpenseIncomeRecognisedInProfitOrLoss" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Recognised in Profit or Loss</link:label>
    <link:label id="lab_ifrs-full_DeferredTaxExpenseIncomeRecognisedInProfitOrLoss_label_en-US" xlink:label="lab_ifrs-full_DeferredTaxExpenseIncomeRecognisedInProfitOrLoss" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deferred tax expense (income) recognised in profit or loss</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DeferredTaxExpenseIncomeRecognisedInProfitOrLoss" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DeferredTaxExpenseIncomeRecognisedInProfitOrLoss"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DeferredTaxExpenseIncomeRecognisedInProfitOrLoss" xlink:to="lab_ifrs-full_DeferredTaxExpenseIncomeRecognisedInProfitOrLoss" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_ExpensesOfAcquiree_2a2b2eb7-d75a-475c-abd5-bc6304bcdabd_totalLabel_en-US" xlink:label="lab_gmab_ExpensesOfAcquiree" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total</link:label>
    <link:label id="lab_gmab_ExpensesOfAcquiree_label_en-US" xlink:label="lab_gmab_ExpensesOfAcquiree" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Expenses Of Acquiree</link:label>
    <link:label id="lab_gmab_ExpensesOfAcquiree_documentation_en-US" xlink:label="lab_gmab_ExpensesOfAcquiree" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The amount of expenses of the acquiree since the acquisition date included in the consolidated statement of comprehensive income.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_ExpensesOfAcquiree" xlink:href="gmab-20251231.xsd#gmab_ExpensesOfAcquiree"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_ExpensesOfAcquiree" xlink:to="lab_gmab_ExpensesOfAcquiree" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_BorrowingsExcessCashFlowThresholdPrepaymentPercentage_019c5229-c0eb-754b-9bfb-8422f0db1195_terseLabel_en-US" xlink:label="lab_gmab_BorrowingsExcessCashFlowThresholdPrepaymentPercentage" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Excess cash flow, threshold, prepayment percentage</link:label>
    <link:label id="lab_gmab_BorrowingsExcessCashFlowThresholdPrepaymentPercentage_label_en-US" xlink:label="lab_gmab_BorrowingsExcessCashFlowThresholdPrepaymentPercentage" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Borrowings, Excess Cash Flow, Threshold, Prepayment Percentage</link:label>
    <link:label id="lab_gmab_BorrowingsExcessCashFlowThresholdPrepaymentPercentage_documentation_en-US" xlink:label="lab_gmab_BorrowingsExcessCashFlowThresholdPrepaymentPercentage" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Borrowings, Excess Cash Flow, Threshold, Prepayment Percentage</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_BorrowingsExcessCashFlowThresholdPrepaymentPercentage" xlink:href="gmab-20251231.xsd#gmab_BorrowingsExcessCashFlowThresholdPrepaymentPercentage"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_BorrowingsExcessCashFlowThresholdPrepaymentPercentage" xlink:to="lab_gmab_BorrowingsExcessCashFlowThresholdPrepaymentPercentage" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_TypesOfRisksAxis_99f507f3-d94f-4d10-8a95-6b812e9d0e19_terseLabel_en-US" xlink:label="lab_ifrs-full_TypesOfRisksAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Types of risks [axis]</link:label>
    <link:label id="lab_ifrs-full_TypesOfRisksAxis_label_en-US" xlink:label="lab_ifrs-full_TypesOfRisksAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Types of risks [axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfRisksAxis" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfRisksAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_TypesOfRisksAxis" xlink:to="lab_ifrs-full_TypesOfRisksAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_AndersGerselPedersenMember_d71079e2-1fe4-4bd0-8dd2-92d3ddfbb344_terseLabel_en-US" xlink:label="lab_gmab_AndersGerselPedersenMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Anders Gersel Pedersen</link:label>
    <link:label id="lab_gmab_AndersGerselPedersenMember_label_en-US" xlink:label="lab_gmab_AndersGerselPedersenMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Anders Gersel Pedersen [Member]</link:label>
    <link:label id="lab_gmab_AndersGerselPedersenMember_documentation_en-US" xlink:label="lab_gmab_AndersGerselPedersenMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents information pertaining to Anders Gersel Pedersen.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_AndersGerselPedersenMember" xlink:href="gmab-20251231.xsd#gmab_AndersGerselPedersenMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_AndersGerselPedersenMember" xlink:to="lab_gmab_AndersGerselPedersenMember" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_ResultsForYearTextBlock_8ccd04af-091a-4fcd-9391-90c93e92366c_terseLabel_en-US" xlink:label="lab_gmab_ResultsForYearTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Result for the Year</link:label>
    <link:label id="lab_gmab_ResultsForYearTextBlock_label_en-US" xlink:label="lab_gmab_ResultsForYearTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Results For Year [Text Block]</link:label>
    <link:label id="lab_gmab_ResultsForYearTextBlock_documentation_en-US" xlink:label="lab_gmab_ResultsForYearTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The entire disclosure for results for the year.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_ResultsForYearTextBlock" xlink:href="gmab-20251231.xsd#gmab_ResultsForYearTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_ResultsForYearTextBlock" xlink:to="lab_gmab_ResultsForYearTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_DisclosureOfWarrantTermsTableTextBlock_019b2c9f-2c8e-7a07-bf79-702b5a99edb6_terseLabel_en-US" xlink:label="lab_gmab_DisclosureOfWarrantTermsTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Summary of warrant terms</link:label>
    <link:label id="lab_gmab_DisclosureOfWarrantTermsTableTextBlock_label_en-US" xlink:label="lab_gmab_DisclosureOfWarrantTermsTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure Of Warrant Terms [Table Text Block]</link:label>
    <link:label id="lab_gmab_DisclosureOfWarrantTermsTableTextBlock_documentation_en-US" xlink:label="lab_gmab_DisclosureOfWarrantTermsTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Disclosure Of Warrant Terms</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_DisclosureOfWarrantTermsTableTextBlock" xlink:href="gmab-20251231.xsd#gmab_DisclosureOfWarrantTermsTableTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_DisclosureOfWarrantTermsTableTextBlock" xlink:to="lab_gmab_DisclosureOfWarrantTermsTableTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DepreciationPropertyPlantAndEquipment_d21dc46d-fb5a-4f01-bf85-9de3924c57ff_negatedLabel_en-US" xlink:label="lab_ifrs-full_DepreciationPropertyPlantAndEquipment" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Depreciation for the year</link:label>
    <link:label id="lab_ifrs-full_DepreciationPropertyPlantAndEquipment_label_en-US" xlink:label="lab_ifrs-full_DepreciationPropertyPlantAndEquipment" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Depreciation, property, plant and equipment</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DepreciationPropertyPlantAndEquipment" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DepreciationPropertyPlantAndEquipment"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DepreciationPropertyPlantAndEquipment" xlink:to="lab_ifrs-full_DepreciationPropertyPlantAndEquipment" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_PurchaseOfInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethod_f60299a3-77e2-4ab2-ac13-a6ff499d5e71_negatedLabel_en-US" xlink:label="lab_ifrs-full_PurchaseOfInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethod" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Marketable securities bought</link:label>
    <link:label id="lab_ifrs-full_PurchaseOfInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethod_label_en-US" xlink:label="lab_ifrs-full_PurchaseOfInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethod" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Purchase of investments other than investments accounted for using equity method</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PurchaseOfInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethod" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PurchaseOfInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethod"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_PurchaseOfInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethod" xlink:to="lab_ifrs-full_PurchaseOfInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethod" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_ShareCapitalAbstract_2ac378f1-d235-4435-9979-d36f976cb125_terseLabel_en-US" xlink:label="lab_gmab_ShareCapitalAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share capital (USD million)</link:label>
    <link:label id="lab_gmab_ShareCapitalAbstract_label_en-US" xlink:label="lab_gmab_ShareCapitalAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share capital [Abstract]</link:label>
    <link:label id="lab_gmab_ShareCapitalAbstract_documentation_en-US" xlink:label="lab_gmab_ShareCapitalAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">No definition available.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_ShareCapitalAbstract" xlink:href="gmab-20251231.xsd#gmab_ShareCapitalAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_ShareCapitalAbstract" xlink:to="lab_gmab_ShareCapitalAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AttributionOfExpensesByNatureToTheirFunctionAxis_019be51b-cc06-715d-b612-8f544db42dc2_terseLabel_en-US" xlink:label="lab_ifrs-full_AttributionOfExpensesByNatureToTheirFunctionAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Attribution of expenses by nature to their function [axis]</link:label>
    <link:label id="lab_ifrs-full_AttributionOfExpensesByNatureToTheirFunctionAxis_label_en-US" xlink:label="lab_ifrs-full_AttributionOfExpensesByNatureToTheirFunctionAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Attribution of expenses by nature to their function [axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AttributionOfExpensesByNatureToTheirFunctionAxis" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AttributionOfExpensesByNatureToTheirFunctionAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AttributionOfExpensesByNatureToTheirFunctionAxis" xlink:to="lab_ifrs-full_AttributionOfExpensesByNatureToTheirFunctionAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_FinancialAssetsAtAmortisedCostCategoryMember_677200c0-f921-4f71-a774-faf31000479a_terseLabel_en-US" xlink:label="lab_ifrs-full_FinancialAssetsAtAmortisedCostCategoryMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Financial assets measured at amortized cost</link:label>
    <link:label id="lab_ifrs-full_FinancialAssetsAtAmortisedCostCategoryMember_label_en-US" xlink:label="lab_ifrs-full_FinancialAssetsAtAmortisedCostCategoryMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Financial assets at amortised cost, category [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialAssetsAtAmortisedCostCategoryMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssetsAtAmortisedCostCategoryMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_FinancialAssetsAtAmortisedCostCategoryMember" xlink:to="lab_ifrs-full_FinancialAssetsAtAmortisedCostCategoryMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ParValuePerShare_019b2d0e-f70c-72d0-84b5-955b1ba6ba54_netLabel_en-US" xlink:label="lab_ifrs-full_ParValuePerShare" xlink:role="http://www.xbrl.org/2009/role/netLabel" xlink:type="resource" xml:lang="en-US">Par value per share (in DKK per share)</link:label>
    <link:label id="lab_ifrs-full_ParValuePerShare_ced22801-9ba9-48fa-b946-d48d973e7450_verboseLabel_en-US" xlink:label="lab_ifrs-full_ParValuePerShare" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Nominal amount (in DKK per share)</link:label>
    <link:label id="lab_ifrs-full_ParValuePerShare_label_en-US" xlink:label="lab_ifrs-full_ParValuePerShare" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Par value per share</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ParValuePerShare" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ParValuePerShare"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ParValuePerShare" xlink:to="lab_ifrs-full_ParValuePerShare" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_LaterThanThreeYearsAndNotLaterThanFiveYearsMember_bcf81e01-9770-4498-af70-c61978fdc95e_terseLabel_en-US" xlink:label="lab_ifrs-full_LaterThanThreeYearsAndNotLaterThanFiveYearsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">3 &#8211; 5 years</link:label>
    <link:label id="lab_ifrs-full_LaterThanThreeYearsAndNotLaterThanFiveYearsMember_label_en-US" xlink:label="lab_ifrs-full_LaterThanThreeYearsAndNotLaterThanFiveYearsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Later than three years and not later than five years [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LaterThanThreeYearsAndNotLaterThanFiveYearsMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LaterThanThreeYearsAndNotLaterThanFiveYearsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_LaterThanThreeYearsAndNotLaterThanFiveYearsMember" xlink:to="lab_ifrs-full_LaterThanThreeYearsAndNotLaterThanFiveYearsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfPropertyPlantAndEquipmentExplanatory_27249640-96de-4dbe-971e-a43de6ae456b_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfPropertyPlantAndEquipmentExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of property, plant and equipment</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfPropertyPlantAndEquipmentExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfPropertyPlantAndEquipmentExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of property, plant and equipment [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentExplanatory" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfPropertyPlantAndEquipmentExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentExplanatory" xlink:to="lab_ifrs-full_DisclosureOfPropertyPlantAndEquipmentExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfMaturityAnalysisOfOperatingLeasePaymentsExplanatory_3ee30149-db69-4f20-b5ed-de7feb065dd3_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfMaturityAnalysisOfOperatingLeasePaymentsExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of future minimum payments under our leases</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfMaturityAnalysisOfOperatingLeasePaymentsExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfMaturityAnalysisOfOperatingLeasePaymentsExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of maturity analysis of operating lease payments [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfMaturityAnalysisOfOperatingLeasePaymentsExplanatory" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfMaturityAnalysisOfOperatingLeasePaymentsExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfMaturityAnalysisOfOperatingLeasePaymentsExplanatory" xlink:to="lab_ifrs-full_DisclosureOfMaturityAnalysisOfOperatingLeasePaymentsExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_NetDeferredTaxAssets_48066a48-32e0-46b6-a5ad-c2487262c233_terseLabel_en-US" xlink:label="lab_ifrs-full_NetDeferredTaxAssets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Deferred tax assets</link:label>
    <link:label id="lab_ifrs-full_NetDeferredTaxAssets_label_en-US" xlink:label="lab_ifrs-full_NetDeferredTaxAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net deferred tax assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NetDeferredTaxAssets" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NetDeferredTaxAssets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_NetDeferredTaxAssets" xlink:to="lab_ifrs-full_NetDeferredTaxAssets" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_NumberOfWarrantsRemainingAvailableForIssue_8c73b852-e292-4ca6-a020-ea716a065437_terseLabel_en-US" xlink:label="lab_gmab_NumberOfWarrantsRemainingAvailableForIssue" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Warrants available for issue (in shares)</link:label>
    <link:label id="lab_gmab_NumberOfWarrantsRemainingAvailableForIssue_label_en-US" xlink:label="lab_gmab_NumberOfWarrantsRemainingAvailableForIssue" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number Of Warrants Remaining Available For Issue</link:label>
    <link:label id="lab_gmab_NumberOfWarrantsRemainingAvailableForIssue_documentation_en-US" xlink:label="lab_gmab_NumberOfWarrantsRemainingAvailableForIssue" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Number of warrants remaining available for issue.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_NumberOfWarrantsRemainingAvailableForIssue" xlink:href="gmab-20251231.xsd#gmab_NumberOfWarrantsRemainingAvailableForIssue"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_NumberOfWarrantsRemainingAvailableForIssue" xlink:to="lab_gmab_NumberOfWarrantsRemainingAvailableForIssue" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_AmendmentFlag_dff5f8c6-684c-4a39-8121-0520637f5589_terseLabel_en-US" xlink:label="lab_dei_AmendmentFlag" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Amendment Flag</link:label>
    <link:label id="lab_dei_AmendmentFlag_label_en-US" xlink:label="lab_dei_AmendmentFlag" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Amendment Flag</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AmendmentFlag"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_AmendmentFlag" xlink:to="lab_dei_AmendmentFlag" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ComponentsOfEquityDomain_f9f84be7-475f-41c3-8da0-6b83d913bfbe_terseLabel_en-US" xlink:label="lab_ifrs-full_ComponentsOfEquityDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Components of equity [domain]</link:label>
    <link:label id="lab_ifrs-full_ComponentsOfEquityDomain_label_en-US" xlink:label="lab_ifrs-full_ComponentsOfEquityDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Components of equity [domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComponentsOfEquityDomain" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ComponentsOfEquityDomain" xlink:to="lab_ifrs-full_ComponentsOfEquityDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_DeirdreP.ConnellyMember_d3938044-54fc-4571-a69c-24324cadf7ed_terseLabel_en-US" xlink:label="lab_gmab_DeirdreP.ConnellyMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Deirdre P. Connelly</link:label>
    <link:label id="lab_gmab_DeirdreP.ConnellyMember_label_en-US" xlink:label="lab_gmab_DeirdreP.ConnellyMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deirdre P. Connelly [Member]</link:label>
    <link:label id="lab_gmab_DeirdreP.ConnellyMember_documentation_en-US" xlink:label="lab_gmab_DeirdreP.ConnellyMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents information pertaining to Deirdre P. Connelly.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_DeirdreP.ConnellyMember" xlink:href="gmab-20251231.xsd#gmab_DeirdreP.ConnellyMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_DeirdreP.ConnellyMember" xlink:to="lab_gmab_DeirdreP.ConnellyMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ChangesInDeferredTaxLiabilityAssetAbstract_019c4eda-9ecd-7abb-a484-0f181d13b76b_terseLabel_en-US" xlink:label="lab_ifrs-full_ChangesInDeferredTaxLiabilityAssetAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Changes in deferred tax liability (asset) [abstract]</link:label>
    <link:label id="lab_ifrs-full_ChangesInDeferredTaxLiabilityAssetAbstract_label_en-US" xlink:label="lab_ifrs-full_ChangesInDeferredTaxLiabilityAssetAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Changes in deferred tax liability (asset) [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ChangesInDeferredTaxLiabilityAssetAbstract" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ChangesInDeferredTaxLiabilityAssetAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ChangesInDeferredTaxLiabilityAssetAbstract" xlink:to="lab_ifrs-full_ChangesInDeferredTaxLiabilityAssetAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForEmployeeBenefitsExplanatory_019b083a-043d-768d-a525-8c680d63b1d3_terseLabel_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForEmployeeBenefitsExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Staff costs</link:label>
    <link:label id="lab_ifrs-full_DescriptionOfAccountingPolicyForEmployeeBenefitsExplanatory_label_en-US" xlink:label="lab_ifrs-full_DescriptionOfAccountingPolicyForEmployeeBenefitsExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Description of accounting policy for employee benefits [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForEmployeeBenefitsExplanatory" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DescriptionOfAccountingPolicyForEmployeeBenefitsExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DescriptionOfAccountingPolicyForEmployeeBenefitsExplanatory" xlink:to="lab_ifrs-full_DescriptionOfAccountingPolicyForEmployeeBenefitsExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_NumberOfInstrumentsOtherEquityInstrumentsWarrantsSettled_019bbce8-91c1-7c0b-b340-9b203a8ed2ac_negatedTerseLabel_en-US" xlink:label="lab_gmab_NumberOfInstrumentsOtherEquityInstrumentsWarrantsSettled" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Settled (in shares)</link:label>
    <link:label id="lab_gmab_NumberOfInstrumentsOtherEquityInstrumentsWarrantsSettled_label_en-US" xlink:label="lab_gmab_NumberOfInstrumentsOtherEquityInstrumentsWarrantsSettled" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number Of Instruments Other Equity Instruments, Warrants, Settled</link:label>
    <link:label id="lab_gmab_NumberOfInstrumentsOtherEquityInstrumentsWarrantsSettled_documentation_en-US" xlink:label="lab_gmab_NumberOfInstrumentsOtherEquityInstrumentsWarrantsSettled" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Number of warrants settled.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_NumberOfInstrumentsOtherEquityInstrumentsWarrantsSettled" xlink:href="gmab-20251231.xsd#gmab_NumberOfInstrumentsOtherEquityInstrumentsWarrantsSettled"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_NumberOfInstrumentsOtherEquityInstrumentsWarrantsSettled" xlink:to="lab_gmab_NumberOfInstrumentsOtherEquityInstrumentsWarrantsSettled" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_CollaborationsAgreementNonCancerTreatmentRoyaltyPercentageOnWorldWideNetSales_03af05e9-d034-4bd3-a474-9742d6607fc2_terseLabel_en-US" xlink:label="lab_gmab_CollaborationsAgreementNonCancerTreatmentRoyaltyPercentageOnWorldWideNetSales" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Royalty percentage for non-cancer treatment</link:label>
    <link:label id="lab_gmab_CollaborationsAgreementNonCancerTreatmentRoyaltyPercentageOnWorldWideNetSales_label_en-US" xlink:label="lab_gmab_CollaborationsAgreementNonCancerTreatmentRoyaltyPercentageOnWorldWideNetSales" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Collaborations Agreement, Non Cancer Treatment, Royalty Percentage On World Wide Net Sales</link:label>
    <link:label id="lab_gmab_CollaborationsAgreementNonCancerTreatmentRoyaltyPercentageOnWorldWideNetSales_documentation_en-US" xlink:label="lab_gmab_CollaborationsAgreementNonCancerTreatmentRoyaltyPercentageOnWorldWideNetSales" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The percentage of royalties of worldwide net sales ofatumumab for the treatment of non-cancer under the agreement.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_CollaborationsAgreementNonCancerTreatmentRoyaltyPercentageOnWorldWideNetSales" xlink:href="gmab-20251231.xsd#gmab_CollaborationsAgreementNonCancerTreatmentRoyaltyPercentageOnWorldWideNetSales"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_CollaborationsAgreementNonCancerTreatmentRoyaltyPercentageOnWorldWideNetSales" xlink:to="lab_gmab_CollaborationsAgreementNonCancerTreatmentRoyaltyPercentageOnWorldWideNetSales" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_NumberOfWarrantsExercisedDuringPeriod_0a480e9c-b31d-47f5-afa0-0afaabb4fb0b_negatedLabel_en-US" xlink:label="lab_gmab_NumberOfWarrantsExercisedDuringPeriod" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Exercised (in shares)</link:label>
    <link:label id="lab_gmab_NumberOfWarrantsExercisedDuringPeriod_64bd7538-3c2a-426d-bc3b-0e9599ee8d3e_verboseLabel_en-US" xlink:label="lab_gmab_NumberOfWarrantsExercisedDuringPeriod" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Exercise of warrants (in shares)</link:label>
    <link:label id="lab_gmab_NumberOfWarrantsExercisedDuringPeriod_label_en-US" xlink:label="lab_gmab_NumberOfWarrantsExercisedDuringPeriod" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number Of Warrants Exercised During Period</link:label>
    <link:label id="lab_gmab_NumberOfWarrantsExercisedDuringPeriod_documentation_en-US" xlink:label="lab_gmab_NumberOfWarrantsExercisedDuringPeriod" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The number of warrants exercised during period.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_NumberOfWarrantsExercisedDuringPeriod" xlink:href="gmab-20251231.xsd#gmab_NumberOfWarrantsExercisedDuringPeriod"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_NumberOfWarrantsExercisedDuringPeriod" xlink:to="lab_gmab_NumberOfWarrantsExercisedDuringPeriod" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis_6bf50896-b3a9-4b2f-ad0e-ac8f173e3d28_terseLabel_en-US" xlink:label="lab_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Temporary difference, unused tax losses and unused tax credits [axis]</link:label>
    <link:label id="lab_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis_label_en-US" xlink:label="lab_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Temporary difference, unused tax losses and unused tax credits [axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis" xlink:to="lab_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_NumberOfTreasurySharesAcquired_019b2cf8-7174-7cb5-9bcc-30da362a6156_terseLabel_en-US" xlink:label="lab_gmab_NumberOfTreasurySharesAcquired" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of treasury shares acquired (in shares)</link:label>
    <link:label id="lab_gmab_NumberOfTreasurySharesAcquired_label_en-US" xlink:label="lab_gmab_NumberOfTreasurySharesAcquired" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number Of Treasury Shares Acquired</link:label>
    <link:label id="lab_gmab_NumberOfTreasurySharesAcquired_documentation_en-US" xlink:label="lab_gmab_NumberOfTreasurySharesAcquired" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Number Of Treasury Shares Acquired</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_NumberOfTreasurySharesAcquired" xlink:href="gmab-20251231.xsd#gmab_NumberOfTreasurySharesAcquired"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_NumberOfTreasurySharesAcquired" xlink:to="lab_gmab_NumberOfTreasurySharesAcquired" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_NumberOfWarrantsCancelled_ce8f2ef8-edcf-4158-ad6e-0d8efe77e4ba_negatedLabel_en-US" xlink:label="lab_gmab_NumberOfWarrantsCancelled" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Forfeited (in shares)</link:label>
    <link:label id="lab_gmab_NumberOfWarrantsCancelled_label_en-US" xlink:label="lab_gmab_NumberOfWarrantsCancelled" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number Of Warrants Cancelled</link:label>
    <link:label id="lab_gmab_NumberOfWarrantsCancelled_documentation_en-US" xlink:label="lab_gmab_NumberOfWarrantsCancelled" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Number of warrants cancelled.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_NumberOfWarrantsCancelled" xlink:href="gmab-20251231.xsd#gmab_NumberOfWarrantsCancelled"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_NumberOfWarrantsCancelled" xlink:to="lab_gmab_NumberOfWarrantsCancelled" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_RangeDomain_ec97a7cc-0e21-4562-afe3-173856bbddeb_terseLabel_en-US" xlink:label="lab_ifrs-full_RangeDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Range [domain]</link:label>
    <link:label id="lab_ifrs-full_RangeDomain_label_en-US" xlink:label="lab_ifrs-full_RangeDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Range [domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RangeDomain" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RangeDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_RangeDomain" xlink:to="lab_ifrs-full_RangeDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ClassesOfContingentLiabilitiesAxis_c38c05f2-76a2-4ec6-878d-113e75191c52_terseLabel_en-US" xlink:label="lab_ifrs-full_ClassesOfContingentLiabilitiesAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Classes of contingent liabilities [axis]</link:label>
    <link:label id="lab_ifrs-full_ClassesOfContingentLiabilitiesAxis_label_en-US" xlink:label="lab_ifrs-full_ClassesOfContingentLiabilitiesAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Classes of contingent liabilities [axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfContingentLiabilitiesAxis" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfContingentLiabilitiesAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ClassesOfContingentLiabilitiesAxis" xlink:to="lab_ifrs-full_ClassesOfContingentLiabilitiesAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_MartineVanVugtMember_0f82eae6-0441-45b1-a862-4cb27028960d_terseLabel_en-US" xlink:label="lab_gmab_MartineVanVugtMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Martine van Vugt</link:label>
    <link:label id="lab_gmab_MartineVanVugtMember_label_en-US" xlink:label="lab_gmab_MartineVanVugtMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Martine van Vugt [Member]</link:label>
    <link:label id="lab_gmab_MartineVanVugtMember_documentation_en-US" xlink:label="lab_gmab_MartineVanVugtMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents information pertaining to Martine van Vugt.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_MartineVanVugtMember" xlink:href="gmab-20251231.xsd#gmab_MartineVanVugtMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_MartineVanVugtMember" xlink:to="lab_gmab_MartineVanVugtMember" xlink:type="arc" order="1"/>
    <link:label id="lab_srt_ScenarioUnspecifiedDomain_dbfeba28-6eb2-4aff-8783-1b0b23e9fca8_terseLabel_en-US" xlink:label="lab_srt_ScenarioUnspecifiedDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Scenario [Domain]</link:label>
    <link:label id="lab_srt_ScenarioUnspecifiedDomain_label_en-US" xlink:label="lab_srt_ScenarioUnspecifiedDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Scenario [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_ScenarioUnspecifiedDomain" xlink:to="lab_srt_ScenarioUnspecifiedDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_PfizerMember_6e1e1529-b80e-41fc-83f5-dfb60a04d041_terseLabel_en-US" xlink:label="lab_gmab_PfizerMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Pfizer</link:label>
    <link:label id="lab_gmab_PfizerMember_label_en-US" xlink:label="lab_gmab_PfizerMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Pfizer [Member]</link:label>
    <link:label id="lab_gmab_PfizerMember_documentation_en-US" xlink:label="lab_gmab_PfizerMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This member stands for Pfizer.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_PfizerMember" xlink:href="gmab-20251231.xsd#gmab_PfizerMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_PfizerMember" xlink:to="lab_gmab_PfizerMember" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding_c47b04dd-13ae-4141-a565-7be40ca07f51_terseLabel_en-US" xlink:label="lab_gmab_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total fair value of RSU granted (in DKK)</link:label>
    <link:label id="lab_gmab_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding_label_en-US" xlink:label="lab_gmab_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding</link:label>
    <link:label id="lab_gmab_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding_documentation_en-US" xlink:label="lab_gmab_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Intrinsic value of outstanding award under share-based payment arrangement. Excludes share and unit options.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding" xlink:href="gmab-20251231.xsd#gmab_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding" xlink:to="lab_gmab_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_LiabilitiesTemporaryDifferenceMember_019c47ec-e4cd-7358-8068-6321d52cd6fc_terseLabel_en-US" xlink:label="lab_gmab_LiabilitiesTemporaryDifferenceMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Liabilities</link:label>
    <link:label id="lab_gmab_LiabilitiesTemporaryDifferenceMember_label_en-US" xlink:label="lab_gmab_LiabilitiesTemporaryDifferenceMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Liabilities, Temporary Difference [Member]</link:label>
    <link:label id="lab_gmab_LiabilitiesTemporaryDifferenceMember_documentation_en-US" xlink:label="lab_gmab_LiabilitiesTemporaryDifferenceMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Liabilities, Temporary Difference</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_LiabilitiesTemporaryDifferenceMember" xlink:href="gmab-20251231.xsd#gmab_LiabilitiesTemporaryDifferenceMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_LiabilitiesTemporaryDifferenceMember" xlink:to="lab_gmab_LiabilitiesTemporaryDifferenceMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_PreviouslyStatedMember_019b07e5-bd72-7ebf-95aa-f75eefa36d7c_terseLabel_en-US" xlink:label="lab_ifrs-full_PreviouslyStatedMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Previously stated</link:label>
    <link:label id="lab_ifrs-full_PreviouslyStatedMember_label_en-US" xlink:label="lab_ifrs-full_PreviouslyStatedMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Previously stated [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PreviouslyStatedMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PreviouslyStatedMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_PreviouslyStatedMember" xlink:to="lab_ifrs-full_PreviouslyStatedMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_IncreaseDecreaseThroughExerciseOfWarrantsEquity_6e2bb424-4769-47b3-921d-e17e2e61f8bf_terseLabel_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseThroughExerciseOfWarrantsEquity" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Exercise of warrants</link:label>
    <link:label id="lab_ifrs-full_IncreaseDecreaseThroughExerciseOfWarrantsEquity_label_en-US" xlink:label="lab_ifrs-full_IncreaseDecreaseThroughExerciseOfWarrantsEquity" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (decrease) through exercise of warrants, equity</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughExerciseOfWarrantsEquity" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseThroughExerciseOfWarrantsEquity"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_IncreaseDecreaseThroughExerciseOfWarrantsEquity" xlink:to="lab_ifrs-full_IncreaseDecreaseThroughExerciseOfWarrantsEquity" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_DisclosureOfCorporateAndDeferredTaxTableTextBlock_224a9e52-6077-4428-b5e4-cb70c06f4da7_terseLabel_en-US" xlink:label="lab_gmab_DisclosureOfCorporateAndDeferredTaxTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of corporate and deferred tax</link:label>
    <link:label id="lab_gmab_DisclosureOfCorporateAndDeferredTaxTableTextBlock_label_en-US" xlink:label="lab_gmab_DisclosureOfCorporateAndDeferredTaxTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure Of Corporate And Deferred Tax [Table Text Block]</link:label>
    <link:label id="lab_gmab_DisclosureOfCorporateAndDeferredTaxTableTextBlock_documentation_en-US" xlink:label="lab_gmab_DisclosureOfCorporateAndDeferredTaxTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Tabular disclosure for corporate and deferred Tax.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_DisclosureOfCorporateAndDeferredTaxTableTextBlock" xlink:href="gmab-20251231.xsd#gmab_DisclosureOfCorporateAndDeferredTaxTableTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_DisclosureOfCorporateAndDeferredTaxTableTextBlock" xlink:to="lab_gmab_DisclosureOfCorporateAndDeferredTaxTableTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_OtherDisclosureTextBlock_751153e0-7b9d-47dd-9b93-a4dd5dc53871_verboseLabel_en-US" xlink:label="lab_gmab_OtherDisclosureTextBlock" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Other Disclosures</link:label>
    <link:label id="lab_gmab_OtherDisclosureTextBlock_label_en-US" xlink:label="lab_gmab_OtherDisclosureTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Disclosure [Text Block]</link:label>
    <link:label id="lab_gmab_OtherDisclosureTextBlock_documentation_en-US" xlink:label="lab_gmab_OtherDisclosureTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The entire information of other disclosures.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_OtherDisclosureTextBlock" xlink:href="gmab-20251231.xsd#gmab_OtherDisclosureTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_OtherDisclosureTextBlock" xlink:to="lab_gmab_OtherDisclosureTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_KeyManagementPersonnelCompensationAnnualCashBonus_7c3459df-023b-4d99-964a-ea5c4c4dcff8_terseLabel_en-US" xlink:label="lab_gmab_KeyManagementPersonnelCompensationAnnualCashBonus" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Annual Cash Bonus</link:label>
    <link:label id="lab_gmab_KeyManagementPersonnelCompensationAnnualCashBonus_label_en-US" xlink:label="lab_gmab_KeyManagementPersonnelCompensationAnnualCashBonus" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Key Management Personnel Compensation, Annual Cash Bonus</link:label>
    <link:label id="lab_gmab_KeyManagementPersonnelCompensationAnnualCashBonus_documentation_en-US" xlink:label="lab_gmab_KeyManagementPersonnelCompensationAnnualCashBonus" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The amount of compensation to key management personnel in the form of cash bonus.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_KeyManagementPersonnelCompensationAnnualCashBonus" xlink:href="gmab-20251231.xsd#gmab_KeyManagementPersonnelCompensationAnnualCashBonus"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_KeyManagementPersonnelCompensationAnnualCashBonus" xlink:to="lab_gmab_KeyManagementPersonnelCompensationAnnualCashBonus" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_ClinicalDevelopmentAndCommercialSuccessAcrossAllThreeProgramsMember_00fd2617-a1e9-47b0-8e35-68f46767de95_terseLabel_en-US" xlink:label="lab_gmab_ClinicalDevelopmentAndCommercialSuccessAcrossAllThreeProgramsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Clinical Development and Commercial Success Across all Three Programs</link:label>
    <link:label id="lab_gmab_ClinicalDevelopmentAndCommercialSuccessAcrossAllThreeProgramsMember_label_en-US" xlink:label="lab_gmab_ClinicalDevelopmentAndCommercialSuccessAcrossAllThreeProgramsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Clinical Development and Commercial Success Across all Three Programs [Member]</link:label>
    <link:label id="lab_gmab_ClinicalDevelopmentAndCommercialSuccessAcrossAllThreeProgramsMember_documentation_en-US" xlink:label="lab_gmab_ClinicalDevelopmentAndCommercialSuccessAcrossAllThreeProgramsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the information pertaining to success of clinical development and commercial success across all the three programs.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_ClinicalDevelopmentAndCommercialSuccessAcrossAllThreeProgramsMember" xlink:href="gmab-20251231.xsd#gmab_ClinicalDevelopmentAndCommercialSuccessAcrossAllThreeProgramsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_ClinicalDevelopmentAndCommercialSuccessAcrossAllThreeProgramsMember" xlink:to="lab_gmab_ClinicalDevelopmentAndCommercialSuccessAcrossAllThreeProgramsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_AddressTypeDomain_019b0cd3-b6e0-7feb-ab4d-8ef9bc7e13fe_terseLabel_en-US" xlink:label="lab_dei_AddressTypeDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Address Type [Domain]</link:label>
    <link:label id="lab_dei_AddressTypeDomain_label_en-US" xlink:label="lab_dei_AddressTypeDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Address Type [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AddressTypeDomain" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AddressTypeDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_AddressTypeDomain" xlink:to="lab_dei_AddressTypeDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_NotionalAmount_019b27d5-4089-7437-870b-4f87c8900fd6_terseLabel_en-US" xlink:label="lab_ifrs-full_NotionalAmount" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Notional amount</link:label>
    <link:label id="lab_ifrs-full_NotionalAmount_019bb3ac-4fed-721c-801b-53a4ee810158_verboseLabel_en-US" xlink:label="lab_ifrs-full_NotionalAmount" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Notional amount</link:label>
    <link:label id="lab_ifrs-full_NotionalAmount_label_en-US" xlink:label="lab_ifrs-full_NotionalAmount" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Notional amount</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NotionalAmount" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NotionalAmount"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_NotionalAmount" xlink:to="lab_ifrs-full_NotionalAmount" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CurrentLeaseLiabilities_5820a4d7-4d78-4025-b53f-77fb129ad042_terseLabel_en-US" xlink:label="lab_ifrs-full_CurrentLeaseLiabilities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Lease liabilities</link:label>
    <link:label id="lab_ifrs-full_CurrentLeaseLiabilities_65bd0bfa-52f7-487a-b2ad-a1ec14d0b914_verboseLabel_en-US" xlink:label="lab_ifrs-full_CurrentLeaseLiabilities" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Current</link:label>
    <link:label id="lab_ifrs-full_CurrentLeaseLiabilities_label_en-US" xlink:label="lab_ifrs-full_CurrentLeaseLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Current lease liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentLeaseLiabilities" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CurrentLeaseLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CurrentLeaseLiabilities" xlink:to="lab_ifrs-full_CurrentLeaseLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_srt_CurrencyAxis_8c6ad677-a01d-4d8c-8657-8e19125f5922_terseLabel_en-US" xlink:label="lab_srt_CurrencyAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Currency [Axis]</link:label>
    <link:label id="lab_srt_CurrencyAxis_label_en-US" xlink:label="lab_srt_CurrencyAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Currency [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CurrencyAxis" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_CurrencyAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_CurrencyAxis" xlink:to="lab_srt_CurrencyAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_CollaborationsAgreementTieredRoyaltyPercentage_a35b23f3-d268-494a-a6d8-ea1be5496c50_terseLabel_en-US" xlink:label="lab_gmab_CollaborationsAgreementTieredRoyaltyPercentage" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Tiered royalty percentage</link:label>
    <link:label id="lab_gmab_CollaborationsAgreementTieredRoyaltyPercentage_label_en-US" xlink:label="lab_gmab_CollaborationsAgreementTieredRoyaltyPercentage" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Collaborations Agreement, Tiered Royalty Percentage</link:label>
    <link:label id="lab_gmab_CollaborationsAgreementTieredRoyaltyPercentage_documentation_en-US" xlink:label="lab_gmab_CollaborationsAgreementTieredRoyaltyPercentage" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The percentage of tiered royalty under the collaboration agreement.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_CollaborationsAgreementTieredRoyaltyPercentage" xlink:href="gmab-20251231.xsd#gmab_CollaborationsAgreementTieredRoyaltyPercentage"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_CollaborationsAgreementTieredRoyaltyPercentage" xlink:to="lab_gmab_CollaborationsAgreementTieredRoyaltyPercentage" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DilutedEarningsLossPerShare_edf9e067-f817-48d9-b863-3ad2176f6854_terseLabel_en-US" xlink:label="lab_ifrs-full_DilutedEarningsLossPerShare" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Diluted net profit per share (in dollars per share)</link:label>
    <link:label id="lab_ifrs-full_DilutedEarningsLossPerShare_22f71043-bea3-4399-ad12-a4862b7698b8_verboseLabel_en-US" xlink:label="lab_ifrs-full_DilutedEarningsLossPerShare" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Earnings per share - diluted (in DKK and US Dollars per share)</link:label>
    <link:label id="lab_ifrs-full_DilutedEarningsLossPerShare_label_en-US" xlink:label="lab_ifrs-full_DilutedEarningsLossPerShare" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Diluted earnings (loss) per share</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DilutedEarningsLossPerShare" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DilutedEarningsLossPerShare"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DilutedEarningsLossPerShare" xlink:to="lab_ifrs-full_DilutedEarningsLossPerShare" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_MaturityDomain_2a343102-c4c4-4e70-89fb-4602b68be529_terseLabel_en-US" xlink:label="lab_ifrs-full_MaturityDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Maturity [domain]</link:label>
    <link:label id="lab_ifrs-full_MaturityDomain_label_en-US" xlink:label="lab_ifrs-full_MaturityDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Maturity [domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MaturityDomain" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MaturityDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_MaturityDomain" xlink:to="lab_ifrs-full_MaturityDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfInterestsInSubsidiariesExplanatory_5858363a-d6fb-4489-b71d-919631e53afa_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfInterestsInSubsidiariesExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of activities of the subsidiary</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfInterestsInSubsidiariesExplanatory_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfInterestsInSubsidiariesExplanatory" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of interests in subsidiaries [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfInterestsInSubsidiariesExplanatory" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfInterestsInSubsidiariesExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfInterestsInSubsidiariesExplanatory" xlink:to="lab_ifrs-full_DisclosureOfInterestsInSubsidiariesExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CategoriesOfFinancialLiabilitiesAxis_717333b6-b0f5-4fa0-b80f-3b1e2c08663d_terseLabel_en-US" xlink:label="lab_ifrs-full_CategoriesOfFinancialLiabilitiesAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Categories of financial liabilities [axis]</link:label>
    <link:label id="lab_ifrs-full_CategoriesOfFinancialLiabilitiesAxis_label_en-US" xlink:label="lab_ifrs-full_CategoriesOfFinancialLiabilitiesAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Categories of financial liabilities [axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialLiabilitiesAxis" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialLiabilitiesAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CategoriesOfFinancialLiabilitiesAxis" xlink:to="lab_ifrs-full_CategoriesOfFinancialLiabilitiesAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable_18994e1d-3204-463a-af6c-dd7bc006b9ef_terseLabel_en-US" xlink:label="lab_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure of terms and conditions of share-based payment arrangement [table]</link:label>
    <link:label id="lab_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable_label_en-US" xlink:label="lab_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of terms and conditions of share-based payment arrangement [table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable" xlink:to="lab_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable" xlink:type="arc" order="1"/>
    <link:label id="lab_gmab_AgreementWithJanssenDuobodyMember_483068cb-0821-4027-89b4-a10b1e1b88c7_terseLabel_en-US" xlink:label="lab_gmab_AgreementWithJanssenDuobodyMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Janssen (DuoBody)</link:label>
    <link:label id="lab_gmab_AgreementWithJanssenDuobodyMember_label_en-US" xlink:label="lab_gmab_AgreementWithJanssenDuobodyMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Agreement with Janssen (DuoBody) [Member]</link:label>
    <link:label id="lab_gmab_AgreementWithJanssenDuobodyMember_documentation_en-US" xlink:label="lab_gmab_AgreementWithJanssenDuobodyMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the information pertaining to agreement with Janssen (DuoBody).</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_gmab_AgreementWithJanssenDuobodyMember" xlink:href="gmab-20251231.xsd#gmab_AgreementWithJanssenDuobodyMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_gmab_AgreementWithJanssenDuobodyMember" xlink:to="lab_gmab_AgreementWithJanssenDuobodyMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AverageEffectiveTaxRate_c90d2f7f-9d6e-42c2-8cf2-165ce7dc7169_terseLabel_en-US" xlink:label="lab_ifrs-full_AverageEffectiveTaxRate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Effective Tax Rate</link:label>
    <link:label id="lab_ifrs-full_AverageEffectiveTaxRate_label_en-US" xlink:label="lab_ifrs-full_AverageEffectiveTaxRate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Average effective tax rate</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AverageEffectiveTaxRate" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AverageEffectiveTaxRate"/>
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    <link:label id="lab_ifrs-full_AtFairValueMember_ab79df5f-c4b0-4640-95ec-9f27c6488e3f_terseLabel_en-US" xlink:label="lab_ifrs-full_AtFairValueMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">At fair value</link:label>
    <link:label id="lab_ifrs-full_AtFairValueMember_label_en-US" xlink:label="lab_ifrs-full_AtFairValueMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">At fair value [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AtFairValueMember" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AtFairValueMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AtFairValueMember" xlink:to="lab_ifrs-full_AtFairValueMember" xlink:type="arc" order="1"/>
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