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    <link:label id="lab_htgc_SBADebenturesIssuedOnNovemberThirtyTwoThousandAndTwentyOneMember_dee96676-a388-495e-9b1e-ab2fd4ed5342_terseLabel_en-US" xlink:label="lab_htgc_SBADebenturesIssuedOnNovemberThirtyTwoThousandAndTwentyOneMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">SBA Debentures Issued on November 30, 2021</link:label>
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    <link:label id="lab_us-gaap_InvestmentUnaffiliatedIssuerMember_8fd8e1f4-29b9-4174-9872-dd89ff56937e_terseLabel_en-US" xlink:label="lab_us-gaap_InvestmentUnaffiliatedIssuerMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Non-control/Non-affiliate investments</link:label>
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    <link:label id="lab_us-gaap_InvestmentCompanyInvestmentIncomeLossFromOperationsPerShare_862694f8-627b-40ea-8542-bc60ac79eff0_totalLabel_en-US" xlink:label="lab_us-gaap_InvestmentCompanyInvestmentIncomeLossFromOperationsPerShare" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total from investment operations (in dollars per share)</link:label>
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    <link:label id="lab_htgc_OurInvestmentsAreConcentratedInCertainTechnologyRelatedIndustriesWhichSubjectsUsToTheRiskOfSignificantLossIfAnyOneOrMoreOfSuchIndustriesExperiencesADownturnMember_documentation_en-US" xlink:label="lab_htgc_OurInvestmentsAreConcentratedInCertainTechnologyRelatedIndustriesWhichSubjectsUsToTheRiskOfSignificantLossIfAnyOneOrMoreOfSuchIndustriesExperiencesADownturnMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Our investments are concentrated in certain technology-related industries, which subjects us to the risk of significant loss if any one or more of such industries experiences a downturn [Member]</link:label>
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    <link:label id="lab_htgc_TwoThousandThirtyOneAssetBackedNotesMember_40f7ed84-4652-425e-8c99-181dbcec83ce_terseLabel_en-US" xlink:label="lab_htgc_TwoThousandThirtyOneAssetBackedNotesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">2031 Asset-Backed Notes</link:label>
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    <link:label id="lab_htgc_TwoThousandThirtyOneAssetBackedNotesMember_documentation_en-US" xlink:label="lab_htgc_TwoThousandThirtyOneAssetBackedNotesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Two thousand thirty one asset-backed notes.</link:label>
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    <link:label id="lab_htgc_OtherInvestmentReceivableMember_fb7608f4-c2bc-4b71-adaf-722e3e3cb704_terseLabel_en-US" xlink:label="lab_htgc_OtherInvestmentReceivableMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other Investment Receivable</link:label>
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    <link:label id="lab_htgc_OtherInvestmentReceivableMember_documentation_en-US" xlink:label="lab_htgc_OtherInvestmentReceivableMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other Investment Receivable</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_OtherInvestmentReceivableMember" xlink:href="htgc-20231231.xsd#htgc_OtherInvestmentReceivableMember"/>
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    <link:label id="lab_us-gaap_EarningsPerShareDiluted_e3e29802-97db-4d1d-badd-5a3d6c38b332_terseLabel_en-US" xlink:label="lab_us-gaap_EarningsPerShareDiluted" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Diluted (in dollars per share)</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDiluted" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EarningsPerShareDiluted"/>
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    <link:label id="lab_us-gaap_ScheduleOfInvestmentsTable_label_en-US" xlink:label="lab_us-gaap_ScheduleOfInvestmentsTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Investments [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentsTable" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfInvestmentsTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable" xlink:to="lab_us-gaap_ScheduleOfInvestmentsTable" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_UnrealizedGainLossOnInvestments_3d44d9c9-68a1-43bd-991e-9636b12f4214_verboseLabel_en-US" xlink:label="lab_us-gaap_UnrealizedGainLossOnInvestments" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total net change in unrealized appreciation (depreciation)</link:label>
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    <link:label id="lab_us-gaap_UnrealizedGainLossOnInvestments_label_en-US" xlink:label="lab_us-gaap_UnrealizedGainLossOnInvestments" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Unrealized Gain (Loss) on Investments</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrealizedGainLossOnInvestments" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_UnrealizedGainLossOnInvestments"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_UnrealizedGainLossOnInvestments" xlink:to="lab_us-gaap_UnrealizedGainLossOnInvestments" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ReceivableTypeDomain_d8d2c01a-fcb6-427d-9f35-440dca7d02fc_terseLabel_en-US" xlink:label="lab_us-gaap_ReceivableTypeDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Receivable [Domain]</link:label>
    <link:label id="lab_us-gaap_ReceivableTypeDomain_label_en-US" xlink:label="lab_us-gaap_ReceivableTypeDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Receivable [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivableTypeDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ReceivableTypeDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ReceivableTypeDomain" xlink:to="lab_us-gaap_ReceivableTypeDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_NetRealizedGainLossAbstract_3cc39541-55cb-440e-8ba0-f878e28f379f_terseLabel_en-US" xlink:label="lab_htgc_NetRealizedGainLossAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Net realized gain (loss):</link:label>
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    <link:label id="lab_htgc_NetRealizedGainLossAbstract_documentation_en-US" xlink:label="lab_htgc_NetRealizedGainLossAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Net realized gain (loss)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_NetRealizedGainLossAbstract" xlink:href="htgc-20231231.xsd#htgc_NetRealizedGainLossAbstract"/>
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    <link:label id="lab_us-gaap_ExtinguishmentOfDebtAmount_3398b8c0-6640-4802-8240-6d8f8d122260_terseLabel_en-US" xlink:label="lab_us-gaap_ExtinguishmentOfDebtAmount" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Debt extinguishment costs</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ExtinguishmentOfDebtAmount" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ExtinguishmentOfDebtAmount"/>
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    <link:label id="lab_htgc_MadrigalPharmaceuticalIncMember_1ded299c-aa8a-4951-8a2f-c60c4f96103f_terseLabel_en-US" xlink:label="lab_htgc_MadrigalPharmaceuticalIncMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Madrigal Pharmaceutical, Inc.</link:label>
    <link:label id="lab_htgc_MadrigalPharmaceuticalIncMember_label_en-US" xlink:label="lab_htgc_MadrigalPharmaceuticalIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Madrigal Pharmaceutical Inc [Member]</link:label>
    <link:label id="lab_htgc_MadrigalPharmaceuticalIncMember_documentation_en-US" xlink:label="lab_htgc_MadrigalPharmaceuticalIncMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Madrigal Pharmaceutical, Inc.</link:label>
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    <link:label id="lab_dei_TradingSymbol_82b48a00-306a-46f9-b186-8883c2d9d1b1_terseLabel_en-US" xlink:label="lab_dei_TradingSymbol" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" 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/2023/dei-2023.xsd#dei_TradingSymbol"/>
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    <link:label id="lab_us-gaap_MemberUnitsMember_40ba1395-cc98-4254-a07f-571e8347fd37_terseLabel_en-US" xlink:label="lab_us-gaap_MemberUnitsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Member Units</link:label>
    <link:label id="lab_us-gaap_MemberUnitsMember_label_en-US" xlink:label="lab_us-gaap_MemberUnitsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Member Units [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MemberUnitsMember" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_MemberUnitsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_MemberUnitsMember" xlink:to="lab_us-gaap_MemberUnitsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_ReplimuneGroupIncMember_98c2d1f3-183c-4644-b743-6cde0275ba6d_terseLabel_en-US" xlink:label="lab_htgc_ReplimuneGroupIncMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Replimune Group, Inc.</link:label>
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    <link:label id="lab_htgc_ReplimuneGroupIncMember_documentation_en-US" xlink:label="lab_htgc_ReplimuneGroupIncMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Replimune Group, Inc. [Member]</link:label>
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    <link:label id="lab_us-gaap_FairValueDisclosuresAbstract_202717a5-2599-45d9-823e-00380e45fc7c_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueDisclosuresAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Fair Value Disclosures [Abstract]</link:label>
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    <link:label id="lab_htgc_LesseeOperatingLeaseLiabilityToBePaidYearTwoAndThree_3e88f9c7-2f27-4107-a65d-bc3221005ce3_terseLabel_en-US" xlink:label="lab_htgc_LesseeOperatingLeaseLiabilityToBePaidYearTwoAndThree" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Lease and License Obligations 1-3 years</link:label>
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    <link:label id="lab_us-gaap_AmortizationOfDebtDiscountPremium_e86ad83e-bfb2-455f-bffe-d3afdcb6c408_terseLabel_en-US" xlink:label="lab_us-gaap_AmortizationOfDebtDiscountPremium" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Amortization of original issue discounts</link:label>
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    <link:label id="lab_htgc_InvestmentHoldingTable_f887b9c9-3fd6-4868-bee3-3839ddb20627_terseLabel_en-US" xlink:label="lab_htgc_InvestmentHoldingTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investment Holding [Table]</link:label>
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    <link:label id="lab_htgc_InvestmentHoldingTable_documentation_en-US" xlink:label="lab_htgc_InvestmentHoldingTable" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investment Holding</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_InvestmentHoldingTable" xlink:href="htgc-20231231.xsd#htgc_InvestmentHoldingTable"/>
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    <link:label id="lab_htgc_VidaHealthIncMember_cf1de949-aca6-4147-a448-2e3022a8ca49_terseLabel_en-US" xlink:label="lab_htgc_VidaHealthIncMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Vida Health, Inc.</link:label>
    <link:label id="lab_htgc_VidaHealthIncMember_label_en-US" xlink:label="lab_htgc_VidaHealthIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Vida Health Inc [Member]</link:label>
    <link:label id="lab_htgc_VidaHealthIncMember_documentation_en-US" xlink:label="lab_htgc_VidaHealthIncMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Vida health inc member.</link:label>
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    <link:label id="lab_htgc_CheckrGroupIncMember_ef51e897-0c2e-44f2-bb62-dbc9d222674a_terseLabel_en-US" xlink:label="lab_htgc_CheckrGroupIncMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Checkr Group, Inc.</link:label>
    <link:label id="lab_htgc_CheckrGroupIncMember_label_en-US" xlink:label="lab_htgc_CheckrGroupIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Checkr Group, Inc. [Member]</link:label>
    <link:label id="lab_htgc_CheckrGroupIncMember_documentation_en-US" xlink:label="lab_htgc_CheckrGroupIncMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Checkr Group, Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_CheckrGroupIncMember" xlink:href="htgc-20231231.xsd#htgc_CheckrGroupIncMember"/>
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    <link:label id="lab_us-gaap_StockholdersEquityAbstract_4cea31c7-f295-4b93-b16a-515e86ce451c_terseLabel_en-US" xlink:label="lab_us-gaap_StockholdersEquityAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Net assets consist of:</link:label>
    <link:label id="lab_us-gaap_StockholdersEquityAbstract_label_en-US" xlink:label="lab_us-gaap_StockholdersEquityAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Equity, Attributable to Parent [Abstract]</link:label>
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    <link:label id="lab_us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_d4b6568b-6193-49c6-8966-be38566f77ff_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Basic and Diluted Earnings Per Share</link:label>
    <link:label id="lab_us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_label_en-US" xlink:label="lab_us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock"/>
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    <link:label id="lab_htgc_SmallBusinessAdministrationDebenturesHcIvMember_label_en-US" xlink:label="lab_htgc_SmallBusinessAdministrationDebenturesHcIvMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Small Business Administration Debentures (HC IV) [Member]</link:label>
    <link:label id="lab_htgc_SmallBusinessAdministrationDebenturesHcIvMember_documentation_en-US" xlink:label="lab_htgc_SmallBusinessAdministrationDebenturesHcIvMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Small Business Administration Debentures (HC IV) [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_SmallBusinessAdministrationDebenturesHcIvMember" xlink:href="htgc-20231231.xsd#htgc_SmallBusinessAdministrationDebenturesHcIvMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_SmallBusinessAdministrationDebenturesHcIvMember" xlink:to="lab_htgc_SmallBusinessAdministrationDebenturesHcIvMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_RelatedPartyTransactionAmountsOfTransaction_d04136bf-155b-4968-9d96-f8c62e207ad2_terseLabel_en-US" xlink:label="lab_us-gaap_RelatedPartyTransactionAmountsOfTransaction" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Related party transactions amount received</link:label>
    <link:label id="lab_us-gaap_RelatedPartyTransactionAmountsOfTransaction_label_en-US" xlink:label="lab_us-gaap_RelatedPartyTransactionAmountsOfTransaction" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Related Party Transaction, Amounts of Transaction</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionAmountsOfTransaction" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyTransactionAmountsOfTransaction"/>
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    <link:label id="lab_us-gaap_DerivativeLiabilityStatementOfFinancialPositionExtensibleEnumeration_7597c3f1-4223-4434-83f8-f55a3ac6fbe3_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeLiabilityStatementOfFinancialPositionExtensibleEnumeration" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Derivative Liability, Statement of Financial Position [Extensible Enumeration]</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilityStatementOfFinancialPositionExtensibleEnumeration" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeLiabilityStatementOfFinancialPositionExtensibleEnumeration"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeLiabilityStatementOfFinancialPositionExtensibleEnumeration" xlink:to="lab_us-gaap_DerivativeLiabilityStatementOfFinancialPositionExtensibleEnumeration" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_InvestmentsInAndAdvancesToAffiliatesTextBlock_c53ae22e-85d3-4990-a430-87a5ee246271_terseLabel_en-US" xlink:label="lab_us-gaap_InvestmentsInAndAdvancesToAffiliatesTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Investments in and Advances to Affiliates</link:label>
    <link:label id="lab_us-gaap_InvestmentsInAndAdvancesToAffiliatesTextBlock_label_en-US" xlink:label="lab_us-gaap_InvestmentsInAndAdvancesToAffiliatesTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investments in and Advances to Affiliates [Table Text Block]</link:label>
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    <link:label id="lab_htgc_SchedulesOfInterestExpenseRelatedDebtFeesAndLossesOnDebtExtinguishmentTableTextBlock_b3728365-1848-4f6c-992a-5f9c297d6c1d_terseLabel_en-US" xlink:label="lab_htgc_SchedulesOfInterestExpenseRelatedDebtFeesAndLossesOnDebtExtinguishmentTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedules of Components of Interest Expense, Related Fees, Losses on Debt Extinguishment and Cash Paid for Interest Expense for Debt</link:label>
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    <link:label id="lab_us-gaap_NetAssetValuePerShare_c9070715-6a3b-4a04-b66f-2878180ed81a_terseLabel_en-US" xlink:label="lab_us-gaap_NetAssetValuePerShare" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Net asset value per share (in dollars per share)</link:label>
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    <link:label id="lab_us-gaap_NetAssetValuePerShare_84412ec0-7644-4987-b6d8-01c4d80c3023_periodEndLabel_en-US" xlink:label="lab_us-gaap_NetAssetValuePerShare" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Net asset value at ending of period (in dollars per share)</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_BabelStreetMember" xlink:to="lab_htgc_BabelStreetMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DebtInstrumentIssuanceDate1_26040fad-ac53-4116-91d3-261c5a713f44_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentIssuanceDate1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Issuance/Pooling Date</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentIssuanceDate1_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentIssuanceDate1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Debt Instrument, Issuance Date</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentIssuanceDate1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentIssuanceDate1"/>
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    <link:label id="lab_dei_EntitySmallBusiness_c90f8257-3dc3-43c1-8bb5-26f55c591414_terseLabel_en-US" xlink:label="lab_dei_EntitySmallBusiness" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Small Business</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitySmallBusiness" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntitySmallBusiness"/>
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    <link:label id="lab_us-gaap_InvestmentTypeCategorizationMember_bcd7dec7-5536-4c80-a86d-aa22a7df4d68_terseLabel_en-US" xlink:label="lab_us-gaap_InvestmentTypeCategorizationMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investments</link:label>
    <link:label id="lab_us-gaap_InvestmentTypeCategorizationMember_label_en-US" xlink:label="lab_us-gaap_InvestmentTypeCategorizationMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investments [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
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    <link:label id="lab_dei_LocalPhoneNumber_0d37ad3a-a4ad-4065-a9d3-e22954b7a852_terseLabel_en-US" xlink:label="lab_dei_LocalPhoneNumber" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" 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/2023/dei-2023.xsd#dei_LocalPhoneNumber"/>
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    <link:label id="lab_us-gaap_InvestmentOwnedPercentOfNetAssets_83ea113d-387f-496b-b98f-eb63d05065f0_terseLabel_en-US" xlink:label="lab_us-gaap_InvestmentOwnedPercentOfNetAssets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investment owned, percent of net assets</link:label>
    <link:label id="lab_us-gaap_InvestmentOwnedPercentOfNetAssets_label_en-US" xlink:label="lab_us-gaap_InvestmentOwnedPercentOfNetAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investment Owned, Net Assets, Percentage</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentOwnedPercentOfNetAssets" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InvestmentOwnedPercentOfNetAssets"/>
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    <link:label id="lab_htgc_InvestmentAffiliatedIssuersAndControlledIssuersMember_fcd18fef-8efc-4e0d-b831-5230673fa083_terseLabel_en-US" xlink:label="lab_htgc_InvestmentAffiliatedIssuersAndControlledIssuersMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investment Affiliated Issuers And Controlled Issuers</link:label>
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    <link:label id="lab_htgc_InvestmentAffiliatedIssuersAndControlledIssuersMember_documentation_en-US" xlink:label="lab_htgc_InvestmentAffiliatedIssuersAndControlledIssuersMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investment Affiliated Issuers And Controlled Issuers</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_InvestmentAffiliatedIssuersAndControlledIssuersMember" xlink:href="htgc-20231231.xsd#htgc_InvestmentAffiliatedIssuersAndControlledIssuersMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_InvestmentAffiliatedIssuersAndControlledIssuersMember" xlink:to="lab_htgc_InvestmentAffiliatedIssuersAndControlledIssuersMember" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_SupplementalDividendsAmountToBePaidEachQuarterPerShare_1f42365d-34d3-4512-a02b-311810560efd_terseLabel_en-US" xlink:label="lab_htgc_SupplementalDividendsAmountToBePaidEachQuarterPerShare" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Supplemental dividends amount to be paid each quarter (in dollars per share)</link:label>
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    <link:label id="lab_htgc_SupplementalDividendsAmountToBePaidEachQuarterPerShare_documentation_en-US" xlink:label="lab_htgc_SupplementalDividendsAmountToBePaidEachQuarterPerShare" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Supplemental Dividends Amount To Be Paid Each Quarter Per Share</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_SupplementalDividendsAmountToBePaidEachQuarterPerShare" xlink:href="htgc-20231231.xsd#htgc_SupplementalDividendsAmountToBePaidEachQuarterPerShare"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_SupplementalDividendsAmountToBePaidEachQuarterPerShare" xlink:to="lab_htgc_SupplementalDividendsAmountToBePaidEachQuarterPerShare" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_ExitFeesReceivables_f2215e16-3482-430b-9372-08197a48eedd_terseLabel_en-US" xlink:label="lab_htgc_ExitFeesReceivables" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total Exit Fees Receivable</link:label>
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    <link:label id="lab_htgc_ExitFeesReceivables_documentation_en-US" xlink:label="lab_htgc_ExitFeesReceivables" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Exit fees receivable.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_ExitFeesReceivables" xlink:href="htgc-20231231.xsd#htgc_ExitFeesReceivables"/>
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    <link:label id="lab_htgc_CapitalInExcessOfParValueMember_2f4bcf50-5178-474a-a5e8-c578c12500b9_terseLabel_en-US" xlink:label="lab_htgc_CapitalInExcessOfParValueMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Capital in Excess of Par Value</link:label>
    <link:label id="lab_htgc_CapitalInExcessOfParValueMember_label_en-US" xlink:label="lab_htgc_CapitalInExcessOfParValueMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Capital In Excess Of Par Value [Member]</link:label>
    <link:label id="lab_htgc_CapitalInExcessOfParValueMember_documentation_en-US" xlink:label="lab_htgc_CapitalInExcessOfParValueMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Capital In Excess Of Par Value [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_CapitalInExcessOfParValueMember" xlink:href="htgc-20231231.xsd#htgc_CapitalInExcessOfParValueMember"/>
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    <link:label id="lab_htgc_DividendDeclaredOneMember_b352c094-ad00-4f17-8891-a31b83371179_terseLabel_en-US" xlink:label="lab_htgc_DividendDeclaredOneMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Dividend Declared One</link:label>
    <link:label id="lab_htgc_DividendDeclaredOneMember_label_en-US" xlink:label="lab_htgc_DividendDeclaredOneMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Dividend Declared One [Member]</link:label>
    <link:label id="lab_htgc_DividendDeclaredOneMember_documentation_en-US" xlink:label="lab_htgc_DividendDeclaredOneMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Dividend Declared One [Member]</link:label>
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    <link:label id="lab_us-gaap_FairValueByMeasurementFrequencyAxis_b1e9a2aa-0bb0-4208-961b-65cd81dc2613_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueByMeasurementFrequencyAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Measurement Frequency</link:label>
    <link:label id="lab_us-gaap_FairValueByMeasurementFrequencyAxis_label_en-US" xlink:label="lab_us-gaap_FairValueByMeasurementFrequencyAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Measurement Frequency [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis" xlink:to="lab_us-gaap_FairValueByMeasurementFrequencyAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_EscrowAndOtherInvestmentReceivableMember_e937a149-643a-48e6-a182-591197aca43c_terseLabel_en-US" xlink:label="lab_htgc_EscrowAndOtherInvestmentReceivableMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Escrow and Other Investment Receivable</link:label>
    <link:label id="lab_htgc_EscrowAndOtherInvestmentReceivableMember_label_en-US" xlink:label="lab_htgc_EscrowAndOtherInvestmentReceivableMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Escrow And Other Investment Receivable [Member]</link:label>
    <link:label id="lab_htgc_EscrowAndOtherInvestmentReceivableMember_documentation_en-US" xlink:label="lab_htgc_EscrowAndOtherInvestmentReceivableMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Escrow And Other Investment Receivable</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_EscrowAndOtherInvestmentReceivableMember" xlink:href="htgc-20231231.xsd#htgc_EscrowAndOtherInvestmentReceivableMember"/>
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    <link:label id="lab_htgc_TheNotesAreStructurallySubordinatedToTheIndebtednessAndOtherLiabilitiesOfOurSubsidiariesMember_label_en-US" xlink:label="lab_htgc_TheNotesAreStructurallySubordinatedToTheIndebtednessAndOtherLiabilitiesOfOurSubsidiariesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">The Notes Are Structurally Subordinated To The Indebtedness And Other Liabilities Of Our Subsidiaries [Member]</link:label>
    <link:label id="lab_htgc_TheNotesAreStructurallySubordinatedToTheIndebtednessAndOtherLiabilitiesOfOurSubsidiariesMember_documentation_en-US" xlink:label="lab_htgc_TheNotesAreStructurallySubordinatedToTheIndebtednessAndOtherLiabilitiesOfOurSubsidiariesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">The Notes are structurally subordinated to the indebtedness and other liabilities of our subsidiaries.</link:label>
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    <link:label id="lab_htgc_UnfundedCommitmentsDueInSeventhYear_30ed4b56-672d-4a42-82e6-b4de7ca64c7a_terseLabel_en-US" xlink:label="lab_htgc_UnfundedCommitmentsDueInSeventhYear" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">2030</link:label>
    <link:label id="lab_htgc_UnfundedCommitmentsDueInSeventhYear_label_en-US" xlink:label="lab_htgc_UnfundedCommitmentsDueInSeventhYear" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Unfunded Commitments Due In Seventh Year</link:label>
    <link:label id="lab_htgc_UnfundedCommitmentsDueInSeventhYear_documentation_en-US" xlink:label="lab_htgc_UnfundedCommitmentsDueInSeventhYear" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Unfunded Commitments Due In Seventh Year</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_UnfundedCommitmentsDueInSeventhYear" xlink:href="htgc-20231231.xsd#htgc_UnfundedCommitmentsDueInSeventhYear"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_UnfundedCommitmentsDueInSeventhYear" xlink:to="lab_htgc_UnfundedCommitmentsDueInSeventhYear" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_RestrictedStockUnitsRSUMember_eb9c3562-84cf-497c-95f1-86fb949e8b6c_terseLabel_en-US" xlink:label="lab_us-gaap_RestrictedStockUnitsRSUMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Restricted stock units</link:label>
    <link:label id="lab_us-gaap_RestrictedStockUnitsRSUMember_label_en-US" xlink:label="lab_us-gaap_RestrictedStockUnitsRSUMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Restricted Stock Units (RSUs) [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RestrictedStockUnitsRSUMember" xlink:to="lab_us-gaap_RestrictedStockUnitsRSUMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ScheduleOfSharebasedCompensationRestrictedStockAndRestrictedStockUnitsActivityTableTextBlock_51ea44e9-f837-4a9c-b871-f4d1b94068b3_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfSharebasedCompensationRestrictedStockAndRestrictedStockUnitsActivityTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Summary of unvested restricted stock equity</link:label>
    <link:label id="lab_us-gaap_ScheduleOfSharebasedCompensationRestrictedStockAndRestrictedStockUnitsActivityTableTextBlock_label_en-US" xlink:label="lab_us-gaap_ScheduleOfSharebasedCompensationRestrictedStockAndRestrictedStockUnitsActivityTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]</link:label>
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    <link:label id="lab_us-gaap_InvestmentOwnedAtCost_3f8568a0-847d-4c6f-a658-4b9e4fe0a9ea_terseLabel_en-US" xlink:label="lab_us-gaap_InvestmentOwnedAtCost" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investment cost</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentOwnedAtCost" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InvestmentOwnedAtCost"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InvestmentOwnedAtCost" xlink:to="lab_us-gaap_InvestmentOwnedAtCost" xlink:type="arc" order="1"/>
    <link:label id="lab_srt_ContractualObligationFiscalYearMaturityScheduleTableTextBlock_12341ecb-8acf-4ea7-91d8-03a54de92127_terseLabel_en-US" xlink:label="lab_srt_ContractualObligationFiscalYearMaturityScheduleTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Contractual Obligations</link:label>
    <link:label id="lab_srt_ContractualObligationFiscalYearMaturityScheduleTableTextBlock_label_en-US" xlink:label="lab_srt_ContractualObligationFiscalYearMaturityScheduleTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Contractual Obligation, Fiscal Year Maturity [Table Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ContractualObligationFiscalYearMaturityScheduleTableTextBlock" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ContractualObligationFiscalYearMaturityScheduleTableTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_ContractualObligationFiscalYearMaturityScheduleTableTextBlock" xlink:to="lab_srt_ContractualObligationFiscalYearMaturityScheduleTableTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_RegulatoryCapitalCommitmentAmount_958dd94a-a01d-4540-a42f-e5454992a4cd_terseLabel_en-US" xlink:label="lab_htgc_RegulatoryCapitalCommitmentAmount" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Regulatory capital commitment amount</link:label>
    <link:label id="lab_htgc_RegulatoryCapitalCommitmentAmount_label_en-US" xlink:label="lab_htgc_RegulatoryCapitalCommitmentAmount" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Regulatory Capital Commitment Amount</link:label>
    <link:label id="lab_htgc_RegulatoryCapitalCommitmentAmount_documentation_en-US" xlink:label="lab_htgc_RegulatoryCapitalCommitmentAmount" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Regulatory capital commitment amount.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_RegulatoryCapitalCommitmentAmount" xlink:href="htgc-20231231.xsd#htgc_RegulatoryCapitalCommitmentAmount"/>
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    <link:label id="lab_htgc_OurExecutiveOfficersAndEmployeesThroughTheAdviserSubsidiaryAreExpectedToManageTheAdviserFundsOrSeparatelyManagedAccountsMember_label_en-US" xlink:label="lab_htgc_OurExecutiveOfficersAndEmployeesThroughTheAdviserSubsidiaryAreExpectedToManageTheAdviserFundsOrSeparatelyManagedAccountsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Our executive officers and employees, through the Adviser Subsidiary, are expected to manage the Adviser Funds or separately managed accounts [Member]</link:label>
    <link:label id="lab_htgc_OurExecutiveOfficersAndEmployeesThroughTheAdviserSubsidiaryAreExpectedToManageTheAdviserFundsOrSeparatelyManagedAccountsMember_documentation_en-US" xlink:label="lab_htgc_OurExecutiveOfficersAndEmployeesThroughTheAdviserSubsidiaryAreExpectedToManageTheAdviserFundsOrSeparatelyManagedAccountsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Our executive officers and employees, through the Adviser Subsidiary, are expected to manage the Adviser Funds or separately managed accounts, which includes funds from External Parties, that operate in the same or a related line of business as we do, which may result in significant conflicts of interest [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_OurExecutiveOfficersAndEmployeesThroughTheAdviserSubsidiaryAreExpectedToManageTheAdviserFundsOrSeparatelyManagedAccountsMember" xlink:href="htgc-20231231.xsd#htgc_OurExecutiveOfficersAndEmployeesThroughTheAdviserSubsidiaryAreExpectedToManageTheAdviserFundsOrSeparatelyManagedAccountsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_OurExecutiveOfficersAndEmployeesThroughTheAdviserSubsidiaryAreExpectedToManageTheAdviserFundsOrSeparatelyManagedAccountsMember" xlink:to="lab_htgc_OurExecutiveOfficersAndEmployeesThroughTheAdviserSubsidiaryAreExpectedToManageTheAdviserFundsOrSeparatelyManagedAccountsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_PortionAtFairValueFairValueDisclosureMember_6cce7b5b-cc54-4543-98e6-6bbc6ce9cf1c_terseLabel_en-US" xlink:label="lab_us-gaap_PortionAtFairValueFairValueDisclosureMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Fair Value Disclosure Item Amounts [Default]</link:label>
    <link:label id="lab_us-gaap_PortionAtFairValueFairValueDisclosureMember_label_en-US" xlink:label="lab_us-gaap_PortionAtFairValueFairValueDisclosureMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Portion at Fair Value Measurement [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember" xlink:to="lab_us-gaap_PortionAtFairValueFairValueDisclosureMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ArrangementsAndNonarrangementTransactionsMember_3c622f90-ab7f-4f8d-bae1-96bd66139159_terseLabel_en-US" xlink:label="lab_us-gaap_ArrangementsAndNonarrangementTransactionsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Collaborative Arrangement and Arrangement Other than Collaborative</link:label>
    <link:label id="lab_us-gaap_ArrangementsAndNonarrangementTransactionsMember_label_en-US" xlink:label="lab_us-gaap_ArrangementsAndNonarrangementTransactionsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Collaborative Arrangement and Arrangement Other than Collaborative [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ArrangementsAndNonarrangementTransactionsMember" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ArrangementsAndNonarrangementTransactionsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ArrangementsAndNonarrangementTransactionsMember" xlink:to="lab_us-gaap_ArrangementsAndNonarrangementTransactionsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_SumoLogicIncMember_3885d870-03b5-4464-aee4-00d059c5d853_terseLabel_en-US" xlink:label="lab_htgc_SumoLogicIncMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Sumo Logic, Inc.</link:label>
    <link:label id="lab_htgc_SumoLogicIncMember_label_en-US" xlink:label="lab_htgc_SumoLogicIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Sumo Logic, Inc. [Member]</link:label>
    <link:label id="lab_htgc_SumoLogicIncMember_documentation_en-US" xlink:label="lab_htgc_SumoLogicIncMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Sumo Logic, Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_SumoLogicIncMember" xlink:href="htgc-20231231.xsd#htgc_SumoLogicIncMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_SumoLogicIncMember" xlink:to="lab_htgc_SumoLogicIncMember" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_SeniorSecuredDebtMember_9c9177c6-a2d2-48a8-87f7-a02dbad0b452_terseLabel_en-US" xlink:label="lab_htgc_SeniorSecuredDebtMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Senior Secured Debt</link:label>
    <link:label id="lab_htgc_SeniorSecuredDebtMember_label_en-US" xlink:label="lab_htgc_SeniorSecuredDebtMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Senior Secured Debt [Member]</link:label>
    <link:label id="lab_htgc_SeniorSecuredDebtMember_documentation_en-US" xlink:label="lab_htgc_SeniorSecuredDebtMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Senior secured debt.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_SeniorSecuredDebtMember" xlink:href="htgc-20231231.xsd#htgc_SeniorSecuredDebtMember"/>
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    <link:label id="lab_us-gaap_ProceedsFromDispositionOfInvestmentOperatingActivity_754a7c34-ca8e-4927-a868-b5884521b84a_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromDispositionOfInvestmentOperatingActivity" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Principal and fee repayments received and proceeds from the sale of debt investments</link:label>
    <link:label id="lab_us-gaap_ProceedsFromDispositionOfInvestmentOperatingActivity_label_en-US" xlink:label="lab_us-gaap_ProceedsFromDispositionOfInvestmentOperatingActivity" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Proceeds from Disposition of Investment, Operating Activity</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromDispositionOfInvestmentOperatingActivity" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ProceedsFromDispositionOfInvestmentOperatingActivity"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProceedsFromDispositionOfInvestmentOperatingActivity" xlink:to="lab_us-gaap_ProceedsFromDispositionOfInvestmentOperatingActivity" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ValuationTechniqueOptionPricingModelMember_42498975-9f5a-484b-b0ff-02b62994b3e4_terseLabel_en-US" xlink:label="lab_us-gaap_ValuationTechniqueOptionPricingModelMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Market Adjusted OPM Backsolve</link:label>
    <link:label id="lab_us-gaap_ValuationTechniqueOptionPricingModelMember_label_en-US" xlink:label="lab_us-gaap_ValuationTechniqueOptionPricingModelMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Valuation Technique, Option Pricing Model [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueOptionPricingModelMember" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ValuationTechniqueOptionPricingModelMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ValuationTechniqueOptionPricingModelMember" xlink:to="lab_us-gaap_ValuationTechniqueOptionPricingModelMember" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_SpilloveramountpershareMember_fcc32fc3-d423-43e5-a06e-ec7f551feb33_terseLabel_en-US" xlink:label="lab_htgc_SpilloveramountpershareMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Spillover amount per share</link:label>
    <link:label id="lab_htgc_SpilloveramountpershareMember_label_en-US" xlink:label="lab_htgc_SpilloveramountpershareMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">SpilloverAmountPerShare [Member]</link:label>
    <link:label id="lab_htgc_SpilloveramountpershareMember_documentation_en-US" xlink:label="lab_htgc_SpilloveramountpershareMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">SpilloverAmountPerShare [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_SpilloveramountpershareMember" xlink:href="htgc-20231231.xsd#htgc_SpilloveramountpershareMember"/>
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    <link:label id="lab_us-gaap_ConsolidationVariableInterestEntityPolicy_d757e2b5-f75c-4b58-94fc-e40ed1171d0b_terseLabel_en-US" xlink:label="lab_us-gaap_ConsolidationVariableInterestEntityPolicy" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Principles of Consolidation</link:label>
    <link:label id="lab_us-gaap_ConsolidationVariableInterestEntityPolicy_label_en-US" xlink:label="lab_us-gaap_ConsolidationVariableInterestEntityPolicy" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Consolidation, Variable Interest Entity, Policy [Policy Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConsolidationVariableInterestEntityPolicy" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConsolidationVariableInterestEntityPolicy"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ConsolidationVariableInterestEntityPolicy" xlink:to="lab_us-gaap_ConsolidationVariableInterestEntityPolicy" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_WarrantInvestmentMember_d8e7f8eb-ef31-44cf-9b4d-07fc08fee2c7_terseLabel_en-US" xlink:label="lab_htgc_WarrantInvestmentMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Warrants</link:label>
    <link:label id="lab_htgc_WarrantInvestmentMember_label_en-US" xlink:label="lab_htgc_WarrantInvestmentMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Warrant Investment [Member]</link:label>
    <link:label id="lab_htgc_WarrantInvestmentMember_documentation_en-US" xlink:label="lab_htgc_WarrantInvestmentMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Warrant Investment.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_WarrantInvestmentMember" xlink:href="htgc-20231231.xsd#htgc_WarrantInvestmentMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_WarrantInvestmentMember" xlink:to="lab_htgc_WarrantInvestmentMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LineOfCreditFacilityDescription_3121f564-497d-4e5a-97eb-925a39f5deb0_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityDescription" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Line of credit facility, description</link:label>
    <link:label id="lab_us-gaap_LineOfCreditFacilityDescription_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityDescription" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Line of Credit Facility, Description</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityDescription" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LineOfCreditFacilityDescription"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditFacilityDescription" xlink:to="lab_us-gaap_LineOfCreditFacilityDescription" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock_6beb0f0a-620e-4e12-8948-f75d702f12a8_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Number of Anti-diluted Shares As Calculated Based on Weighted Average Closing Price of Common Stock</link:label>
    <link:label id="lab_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock_label_en-US" xlink:label="lab_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock" xlink:to="lab_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_InterestExpenseDebt_ed784d9b-d639-4b77-9874-90c644161a23_verboseLabel_en-US" xlink:label="lab_us-gaap_InterestExpenseDebt" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Interest</link:label>
    <link:label id="lab_us-gaap_InterestExpenseDebt_fa1f135d-f88b-4c8d-9da3-bc24669abc9a_terseLabel_en-US" xlink:label="lab_us-gaap_InterestExpenseDebt" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Interest expense</link:label>
    <link:label id="lab_us-gaap_InterestExpenseDebt_label_en-US" xlink:label="lab_us-gaap_InterestExpenseDebt" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Interest Expense, Debt</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseDebt" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InterestExpenseDebt"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InterestExpenseDebt" xlink:to="lab_us-gaap_InterestExpenseDebt" xlink:type="arc" order="1"/>
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    <link:loc xlink:type="locator" xlink:label="loc_htgc_EquityDistributionsAgreementSharesSold" xlink:href="htgc-20231231.xsd#htgc_EquityDistributionsAgreementSharesSold"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_EquityDistributionsAgreementSharesSold" xlink:to="lab_htgc_EquityDistributionsAgreementSharesSold" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_5fdd045d-87b2-4ff0-b771-c239e91a00cc_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">2026</link:label>
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Lessee, Operating Lease, Liability, to be Paid, Year Three</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree" xlink:to="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_FulfilSolutionsIncMember_45a552e5-cdd8-40f2-9f0e-83bfed077cf6_terseLabel_en-US" xlink:label="lab_htgc_FulfilSolutionsIncMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Fulfil Solutions, Inc.</link:label>
    <link:label id="lab_htgc_FulfilSolutionsIncMember_label_en-US" xlink:label="lab_htgc_FulfilSolutionsIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Fulfil Solutions Inc [Member]</link:label>
    <link:label id="lab_htgc_FulfilSolutionsIncMember_documentation_en-US" xlink:label="lab_htgc_FulfilSolutionsIncMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Fulfil Solutions Inc [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_FulfilSolutionsIncMember" xlink:href="htgc-20231231.xsd#htgc_FulfilSolutionsIncMember"/>
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    <link:label id="lab_htgc_BecauseWeHaveSubstantialBorrowingsThePotentialForGainOrLossOnAmountsInvestedInUsIsMagnifiedAndMayIncreaseTheRiskOfInvestingInUsMember_label_en-US" xlink:label="lab_htgc_BecauseWeHaveSubstantialBorrowingsThePotentialForGainOrLossOnAmountsInvestedInUsIsMagnifiedAndMayIncreaseTheRiskOfInvestingInUsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Because we have substantial borrowings, the potential for gain or loss on amounts invested in us is magnified and may increase the risk of investing in us [Member]</link:label>
    <link:label id="lab_htgc_BecauseWeHaveSubstantialBorrowingsThePotentialForGainOrLossOnAmountsInvestedInUsIsMagnifiedAndMayIncreaseTheRiskOfInvestingInUsMember_documentation_en-US" xlink:label="lab_htgc_BecauseWeHaveSubstantialBorrowingsThePotentialForGainOrLossOnAmountsInvestedInUsIsMagnifiedAndMayIncreaseTheRiskOfInvestingInUsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Because we have substantial borrowings, the potential for gain or loss on amounts invested in us is magnified and may increase the risk of investing in us [Member]</link:label>
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    <link:label id="lab_us-gaap_GainLossOnSaleOfDerivatives_e1a2b062-3289-464e-a134-8268a967ed78_terseLabel_en-US" xlink:label="lab_us-gaap_GainLossOnSaleOfDerivatives" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Net realized (gain) loss on derivative investments</link:label>
    <link:label id="lab_us-gaap_GainLossOnSaleOfDerivatives_label_en-US" xlink:label="lab_us-gaap_GainLossOnSaleOfDerivatives" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Gain (Loss) on Sale of Derivatives</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSaleOfDerivatives" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GainLossOnSaleOfDerivatives"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_GainLossOnSaleOfDerivatives" xlink:to="lab_us-gaap_GainLossOnSaleOfDerivatives" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_AppDirectIncMember_79899742-6f7b-491e-bb19-7c45c9e7a53a_terseLabel_en-US" xlink:label="lab_htgc_AppDirectIncMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">AppDirect, Inc.</link:label>
    <link:label id="lab_htgc_AppDirectIncMember_label_en-US" xlink:label="lab_htgc_AppDirectIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">AppDirect, Inc. [Member]</link:label>
    <link:label id="lab_htgc_AppDirectIncMember_documentation_en-US" xlink:label="lab_htgc_AppDirectIncMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">AppDirect, Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_AppDirectIncMember" xlink:href="htgc-20231231.xsd#htgc_AppDirectIncMember"/>
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    <link:label id="lab_us-gaap_InvestmentInterestRate_4939e779-1413-400f-a610-72c9109eab53_terseLabel_en-US" xlink:label="lab_us-gaap_InvestmentInterestRate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Interest rate</link:label>
    <link:label id="lab_us-gaap_InvestmentInterestRate_label_en-US" xlink:label="lab_us-gaap_InvestmentInterestRate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investment Interest Rate</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentInterestRate" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InvestmentInterestRate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InvestmentInterestRate" xlink:to="lab_us-gaap_InvestmentInterestRate" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_1a1b07b3-357b-41fd-ad6e-d5119775649e_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">2025</link:label>
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Lessee, Operating Lease, Liability, to be Paid, Year Two</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo"/>
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    <link:label id="lab_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvesteesMember_3ce71d85-3d45-4adb-907e-b5c6c8508cce_terseLabel_en-US" xlink:label="lab_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvesteesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Equity Method Investment, Nonconsolidated Investee or Group of Investees</link:label>
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    <link:label id="lab_htgc_LinenMasterLLCMember_69e57c0f-d66c-44a3-9ed6-269b1d463710_terseLabel_en-US" xlink:label="lab_htgc_LinenMasterLLCMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">LinenMaster, LLC</link:label>
    <link:label id="lab_htgc_LinenMasterLLCMember_label_en-US" xlink:label="lab_htgc_LinenMasterLLCMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">LinenMaster, LLC [Member]</link:label>
    <link:label id="lab_htgc_LinenMasterLLCMember_documentation_en-US" xlink:label="lab_htgc_LinenMasterLLCMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">LinenMaster, LLC</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_LinenMasterLLCMember" xlink:href="htgc-20231231.xsd#htgc_LinenMasterLLCMember"/>
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    <link:label id="lab_dei_SecurityExchangeName_d95b4d36-6bdb-476f-ab6d-230799c343eb_terseLabel_en-US" xlink:label="lab_dei_SecurityExchangeName" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" 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/2023/dei-2023.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_us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy_e6f2a633-6b0c-48fb-8158-4fbdb32ba722_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Stock Based Compensation</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy"/>
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    <link:label id="lab_htgc_ThreeMonthLIBORMember_397c7215-444a-4743-8325-8f337ff1a961_terseLabel_en-US" xlink:label="lab_htgc_ThreeMonthLIBORMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">3-month LIBOR</link:label>
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    <link:label id="lab_us-gaap_EmployeeStockOptionMember_28a5c400-458e-4930-99e0-19d99f83a1a4_terseLabel_en-US" xlink:label="lab_us-gaap_EmployeeStockOptionMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Employee Stock Option Member</link:label>
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    <link:label id="lab_us-gaap_EmployeeStockOptionMember_label_en-US" xlink:label="lab_us-gaap_EmployeeStockOptionMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Employee Stock Option [Member]</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EmployeeStockOptionMember" xlink:to="lab_us-gaap_EmployeeStockOptionMember" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_SMBCFacilityMember_0b21d01c-c1d3-4d5d-bd12-9b3d03ac4bca_terseLabel_en-US" xlink:label="lab_htgc_SMBCFacilityMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">SMBC Facility</link:label>
    <link:label id="lab_htgc_SMBCFacilityMember_label_en-US" xlink:label="lab_htgc_SMBCFacilityMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">S M B C Facility [Member]</link:label>
    <link:label id="lab_htgc_SMBCFacilityMember_documentation_en-US" xlink:label="lab_htgc_SMBCFacilityMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">SMBC facility.</link:label>
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    <link:label id="lab_srt_MaximumMember_ca76d9a1-eb22-4f0d-a3c4-b548987f261b_terseLabel_en-US" xlink:label="lab_srt_MaximumMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" 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" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Maximum [Member]</link:label>
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    <link:label id="lab_dei_DocumentType_eae85c1c-9aba-402f-ba84-80b85b335825_terseLabel_en-US" xlink:label="lab_dei_DocumentType" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Document Type</link:label>
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    <link:label id="lab_us-gaap_DebtRelatedCommitmentFeesAndDebtIssuanceCosts_e9ef1e50-69b6-4eeb-b42e-522024921172_terseLabel_en-US" xlink:label="lab_us-gaap_DebtRelatedCommitmentFeesAndDebtIssuanceCosts" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Loan fees</link:label>
    <link:label id="lab_us-gaap_DebtRelatedCommitmentFeesAndDebtIssuanceCosts_label_en-US" xlink:label="lab_us-gaap_DebtRelatedCommitmentFeesAndDebtIssuanceCosts" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Debt Related Commitment Fees and Debt Issuance Costs</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtRelatedCommitmentFeesAndDebtIssuanceCosts" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtRelatedCommitmentFeesAndDebtIssuanceCosts"/>
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    <link:label id="lab_htgc_AryakaNetworksIncMember_10370400-95ca-4457-a8b7-89b0dd40377f_terseLabel_en-US" xlink:label="lab_htgc_AryakaNetworksIncMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Aryaka Networks, Inc.</link:label>
    <link:label id="lab_htgc_AryakaNetworksIncMember_label_en-US" xlink:label="lab_htgc_AryakaNetworksIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Aryaka Networks Inc [Member]</link:label>
    <link:label id="lab_htgc_AryakaNetworksIncMember_documentation_en-US" xlink:label="lab_htgc_AryakaNetworksIncMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Aryaka Networks, Inc.</link:label>
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    <link:label id="lab_us-gaap_LineOfCreditFacilityInterestRateDuringPeriod_681b2003-fdfd-4c8f-b423-3aa5eb0c63b9_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityInterestRateDuringPeriod" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Line of credit interest rate</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityInterestRateDuringPeriod" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LineOfCreditFacilityInterestRateDuringPeriod"/>
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    <link:label id="lab_us-gaap_GeographicConcentrationRiskMember_7f467d7f-7b7c-494d-a2b3-26fec6cf1776_terseLabel_en-US" xlink:label="lab_us-gaap_GeographicConcentrationRiskMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Geographic Concentration Risk</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeographicConcentrationRiskMember" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GeographicConcentrationRiskMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_GeographicConcentrationRiskMember" xlink:to="lab_us-gaap_GeographicConcentrationRiskMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_InvestmentInterestRatePaidInCash_6a05f1be-5730-4239-8b9f-03e1226813ce_terseLabel_en-US" xlink:label="lab_us-gaap_InvestmentInterestRatePaidInCash" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Interest rate paid in cash</link:label>
    <link:label id="lab_us-gaap_InvestmentInterestRatePaidInCash_18fbd566-1e3d-4568-87a3-dffff3e2feda_verboseLabel_en-US" xlink:label="lab_us-gaap_InvestmentInterestRatePaidInCash" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Interest rate and floor, fixed</link:label>
    <link:label id="lab_us-gaap_InvestmentInterestRatePaidInCash_label_en-US" xlink:label="lab_us-gaap_InvestmentInterestRatePaidInCash" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investment, Interest Rate, Paid in Cash</link:label>
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    <link:label id="lab_htgc_AdviserSubsidiaryMember_1c6257b7-8057-4869-97b6-a21203330277_terseLabel_en-US" xlink:label="lab_htgc_AdviserSubsidiaryMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Adviser Subsidiary</link:label>
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    <link:label id="lab_htgc_AdviserSubsidiaryMember_documentation_en-US" xlink:label="lab_htgc_AdviserSubsidiaryMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Adviser subsidiary.</link:label>
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    <link:label id="lab_htgc_CommitmentsAndContingenciesTable_documentation_en-US" xlink:label="lab_htgc_CommitmentsAndContingenciesTable" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Commitments and contingencies.</link:label>
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    <link:label id="lab_htgc_InvestmentTypeConcentrationRiskMember_00e8c784-1bb7-4382-b754-c11e3c7c063f_terseLabel_en-US" xlink:label="lab_htgc_InvestmentTypeConcentrationRiskMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investment Type Concentration Risk</link:label>
    <link:label id="lab_htgc_InvestmentTypeConcentrationRiskMember_label_en-US" xlink:label="lab_htgc_InvestmentTypeConcentrationRiskMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investment Type Concentration Risk [Member]</link:label>
    <link:label id="lab_htgc_InvestmentTypeConcentrationRiskMember_documentation_en-US" xlink:label="lab_htgc_InvestmentTypeConcentrationRiskMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investment Type Concentration Risk Member</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_InvestmentTypeConcentrationRiskMember" xlink:href="htgc-20231231.xsd#htgc_InvestmentTypeConcentrationRiskMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_InvestmentTypeConcentrationRiskMember" xlink:to="lab_htgc_InvestmentTypeConcentrationRiskMember" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_ProceedsFromDispositionOfInvestmentEquityInvestmentsOperatingActivity_6e7aa980-e519-44d9-a1e0-b413a0805616_terseLabel_en-US" xlink:label="lab_htgc_ProceedsFromDispositionOfInvestmentEquityInvestmentsOperatingActivity" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Proceeds from the sale of equity investments</link:label>
    <link:label id="lab_htgc_ProceedsFromDispositionOfInvestmentEquityInvestmentsOperatingActivity_label_en-US" xlink:label="lab_htgc_ProceedsFromDispositionOfInvestmentEquityInvestmentsOperatingActivity" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Proceeds From Disposition Of Investment, Equity Investments, Operating Activity</link:label>
    <link:label id="lab_htgc_ProceedsFromDispositionOfInvestmentEquityInvestmentsOperatingActivity_documentation_en-US" xlink:label="lab_htgc_ProceedsFromDispositionOfInvestmentEquityInvestmentsOperatingActivity" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Proceeds From Disposition Of Investment, Equity Investments, Operating Activity</link:label>
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    <link:label id="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive_de097797-f02c-454f-a7f7-7ba8eac00253_terseLabel_en-US" xlink:label="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Debt After 5 years</link:label>
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    <link:label id="lab_us-gaap_AntidilutiveSecuritiesNameDomain_9ea3975c-3ba2-4145-9fb1-b763e5879b0e_terseLabel_en-US" xlink:label="lab_us-gaap_AntidilutiveSecuritiesNameDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Antidilutive Securities, Name</link:label>
    <link:label id="lab_us-gaap_AntidilutiveSecuritiesNameDomain_label_en-US" xlink:label="lab_us-gaap_AntidilutiveSecuritiesNameDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Antidilutive Securities, Name [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain" xlink:to="lab_us-gaap_AntidilutiveSecuritiesNameDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_MajorityOwnedControlInvestmentsMember_46697f8a-2103-4a99-af4e-40bfefcbc450_terseLabel_en-US" xlink:label="lab_htgc_MajorityOwnedControlInvestmentsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Majority Owned Control Investments</link:label>
    <link:label id="lab_htgc_MajorityOwnedControlInvestmentsMember_label_en-US" xlink:label="lab_htgc_MajorityOwnedControlInvestmentsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Majority Owned Control Investments [Member]</link:label>
    <link:label id="lab_htgc_MajorityOwnedControlInvestmentsMember_documentation_en-US" xlink:label="lab_htgc_MajorityOwnedControlInvestmentsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Majority Owned Control Investments [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_MajorityOwnedControlInvestmentsMember" xlink:href="htgc-20231231.xsd#htgc_MajorityOwnedControlInvestmentsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_MajorityOwnedControlInvestmentsMember" xlink:to="lab_htgc_MajorityOwnedControlInvestmentsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_0ea5f3ff-8432-4861-9ae2-eaf6f6763d3c_terseLabel_en-US" xlink:label="lab_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Equity Incentive Plans</link:label>
    <link:label id="lab_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_label_en-US" xlink:label="lab_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share-Based Payment Arrangement [Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock"/>
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    <link:label id="lab_htgc_JulyTwoThousandTwentyFourNotesMember_0056c660-56bd-4dba-b0f6-114a3b5bf0d7_terseLabel_en-US" xlink:label="lab_htgc_JulyTwoThousandTwentyFourNotesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">July 2024 Notes</link:label>
    <link:label id="lab_htgc_JulyTwoThousandTwentyFourNotesMember_label_en-US" xlink:label="lab_htgc_JulyTwoThousandTwentyFourNotesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">July Two Thousand Twenty Four Notes [Member]</link:label>
    <link:label id="lab_htgc_JulyTwoThousandTwentyFourNotesMember_documentation_en-US" xlink:label="lab_htgc_JulyTwoThousandTwentyFourNotesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">July two thousand twenty four notes.</link:label>
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    <link:label id="lab_us-gaap_BasisOfAccountingPolicyPolicyTextBlock_545c31d1-dc6d-46b3-bc53-fde40dca54c3_terseLabel_en-US" xlink:label="lab_us-gaap_BasisOfAccountingPolicyPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Basis of Presentation</link:label>
    <link:label id="lab_us-gaap_BasisOfAccountingPolicyPolicyTextBlock_label_en-US" xlink:label="lab_us-gaap_BasisOfAccountingPolicyPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Basis of Accounting, Policy [Policy Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BasisOfAccountingPolicyPolicyTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BasisOfAccountingPolicyPolicyTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BasisOfAccountingPolicyPolicyTextBlock" xlink:to="lab_us-gaap_BasisOfAccountingPolicyPolicyTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_NetInvestmentIncomeAbstract_6f7c3975-9e4d-466f-928d-67521c94b529_terseLabel_en-US" xlink:label="lab_us-gaap_NetInvestmentIncomeAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investment income:</link:label>
    <link:label id="lab_us-gaap_NetInvestmentIncomeAbstract_label_en-US" xlink:label="lab_us-gaap_NetInvestmentIncomeAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Net Investment Income [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetInvestmentIncomeAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetInvestmentIncomeAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetInvestmentIncomeAbstract" xlink:to="lab_us-gaap_NetInvestmentIncomeAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_AsAnInternallyManagedBdcWeAreSubjectToCertainRestrictionsThatMayAdverselyAffectOurBusinessMember_label_en-US" xlink:label="lab_htgc_AsAnInternallyManagedBdcWeAreSubjectToCertainRestrictionsThatMayAdverselyAffectOurBusinessMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">As an internally managed BDC, we are subject to certain restrictions that may adversely affect our business [Member]</link:label>
    <link:label id="lab_htgc_AsAnInternallyManagedBdcWeAreSubjectToCertainRestrictionsThatMayAdverselyAffectOurBusinessMember_documentation_en-US" xlink:label="lab_htgc_AsAnInternallyManagedBdcWeAreSubjectToCertainRestrictionsThatMayAdverselyAffectOurBusinessMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">As an internally managed BDC, we are subject to certain restrictions that may adversely affect our business [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_AsAnInternallyManagedBdcWeAreSubjectToCertainRestrictionsThatMayAdverselyAffectOurBusinessMember" xlink:href="htgc-20231231.xsd#htgc_AsAnInternallyManagedBdcWeAreSubjectToCertainRestrictionsThatMayAdverselyAffectOurBusinessMember"/>
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    <link:label id="lab_htgc_TaxableNetRealizedGainLossPerShare_9069ae2d-890a-416d-b46d-8f7cf00c6f0f_terseLabel_en-US" xlink:label="lab_htgc_TaxableNetRealizedGainLossPerShare" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Taxable net realized gains, per share (in dollars per share)</link:label>
    <link:label id="lab_htgc_TaxableNetRealizedGainLossPerShare_label_en-US" xlink:label="lab_htgc_TaxableNetRealizedGainLossPerShare" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Taxable Net Realized Gain (Loss) Per Share</link:label>
    <link:label id="lab_htgc_TaxableNetRealizedGainLossPerShare_documentation_en-US" xlink:label="lab_htgc_TaxableNetRealizedGainLossPerShare" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Taxable net realized gain (loss) per share.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_TaxableNetRealizedGainLossPerShare" xlink:href="htgc-20231231.xsd#htgc_TaxableNetRealizedGainLossPerShare"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_TaxableNetRealizedGainLossPerShare" xlink:to="lab_htgc_TaxableNetRealizedGainLossPerShare" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_SeniorSecuritiesMember_label_en-US" xlink:label="lab_htgc_SeniorSecuritiesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Senior Securities [Member]</link:label>
    <link:label id="lab_htgc_SeniorSecuritiesMember_documentation_en-US" xlink:label="lab_htgc_SeniorSecuritiesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Senior Securities [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_SeniorSecuritiesMember" xlink:href="htgc-20231231.xsd#htgc_SeniorSecuritiesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_SeniorSecuritiesMember" xlink:to="lab_htgc_SeniorSecuritiesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_MainStreetRuralIncMember_c9e9e141-fccd-4b30-8335-ab951c589a35_terseLabel_en-US" xlink:label="lab_htgc_MainStreetRuralIncMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Main Street Rural, Inc.</link:label>
    <link:label id="lab_htgc_MainStreetRuralIncMember_label_en-US" xlink:label="lab_htgc_MainStreetRuralIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Main Street Rural, Inc. [Member]</link:label>
    <link:label id="lab_htgc_MainStreetRuralIncMember_documentation_en-US" xlink:label="lab_htgc_MainStreetRuralIncMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Main Street Rural, Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_MainStreetRuralIncMember" xlink:href="htgc-20231231.xsd#htgc_MainStreetRuralIncMember"/>
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    <link:label id="lab_us-gaap_InvestmentOwnedBalancePrincipalAmount_6c5410ae-796b-44eb-959a-8987f5beb27c_terseLabel_en-US" xlink:label="lab_us-gaap_InvestmentOwnedBalancePrincipalAmount" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Principal amount</link:label>
    <link:label id="lab_us-gaap_InvestmentOwnedBalancePrincipalAmount_label_en-US" xlink:label="lab_us-gaap_InvestmentOwnedBalancePrincipalAmount" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investment Owned, Balance, Principal Amount</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentOwnedBalancePrincipalAmount" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InvestmentOwnedBalancePrincipalAmount"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InvestmentOwnedBalancePrincipalAmount" xlink:to="lab_us-gaap_InvestmentOwnedBalancePrincipalAmount" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_VariableRateAxis_0ae9f75b-1560-45ce-aa57-4343b30bab03_terseLabel_en-US" xlink:label="lab_us-gaap_VariableRateAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Variable Rate</link:label>
    <link:label id="lab_us-gaap_VariableRateAxis_label_en-US" xlink:label="lab_us-gaap_VariableRateAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Variable Rate [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_VariableRateAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_VariableRateAxis" xlink:to="lab_us-gaap_VariableRateAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_NetInvestmentIncome_1e90dee4-ad2c-425f-833d-c288815d1fe8_totalLabel_en-US" xlink:label="lab_us-gaap_NetInvestmentIncome" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Net investment income</link:label>
    <link:label id="lab_us-gaap_NetInvestmentIncome_label_en-US" xlink:label="lab_us-gaap_NetInvestmentIncome" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Net Investment Income</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetInvestmentIncome" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetInvestmentIncome"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetInvestmentIncome" xlink:to="lab_us-gaap_NetInvestmentIncome" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_Security12bTitle_0acb2cf0-e22a-4c49-972e-26799a5b30f0_terseLabel_en-US" xlink:label="lab_dei_Security12bTitle" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Title of 12(b) Security</link:label>
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    <link:label id="lab_us-gaap_InvestmentCompanyFinancialHighlightsTextBlock_48625789-1809-401f-9f45-f3549543ada3_terseLabel_en-US" xlink:label="lab_us-gaap_InvestmentCompanyFinancialHighlightsTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Financial Highlights</link:label>
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    <link:label id="lab_us-gaap_InterestIncomeOperating_3fc992a7-a155-4a3f-9282-1a03b0df2431_verboseLabel_en-US" xlink:label="lab_us-gaap_InterestIncomeOperating" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Interest income</link:label>
    <link:label id="lab_us-gaap_InterestIncomeOperating_label_en-US" xlink:label="lab_us-gaap_InterestIncomeOperating" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Interest Income, Operating</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeOperating" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InterestIncomeOperating"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InterestIncomeOperating" xlink:to="lab_us-gaap_InterestIncomeOperating" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_RelatedPartyDomain_e4fb541d-dbe2-4d46-9405-30a4ca3fadd8_terseLabel_en-US" xlink:label="lab_us-gaap_RelatedPartyDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Related Party</link:label>
    <link:label id="lab_us-gaap_RelatedPartyDomain_label_en-US" xlink:label="lab_us-gaap_RelatedPartyDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Related Party, Type [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyDomain"/>
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    <link:label id="lab_us-gaap_StockholdersEquityPolicyTextBlock_da1fbcbe-0c5f-4f8a-bc71-bf08c4a78844_terseLabel_en-US" xlink:label="lab_us-gaap_StockholdersEquityPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Distributions</link:label>
    <link:label id="lab_us-gaap_StockholdersEquityPolicyTextBlock_label_en-US" xlink:label="lab_us-gaap_StockholdersEquityPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Stockholders' Equity, Policy [Policy Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityPolicyTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockholdersEquityPolicyTextBlock"/>
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    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_4583f6a9-82b4-4a19-bc0c-ff8bc48e3101_periodStartLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Unvested shares beginning of period (in dollars per share)</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
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    <link:label id="lab_htgc_AgilenceIncMember_a93f14df-5684-4889-8259-b8d59633fff4_terseLabel_en-US" xlink:label="lab_htgc_AgilenceIncMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Agilence, Inc.</link:label>
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    <link:label id="lab_htgc_AgilenceIncMember_documentation_en-US" xlink:label="lab_htgc_AgilenceIncMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Agilence, Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_AgilenceIncMember" xlink:href="htgc-20231231.xsd#htgc_AgilenceIncMember"/>
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    <link:label id="lab_htgc_LesseeOperatingLeaseLiabilityToBePaidYearFourAndFive_ef4c01d6-a174-440f-bad4-a3113d485a8d_terseLabel_en-US" xlink:label="lab_htgc_LesseeOperatingLeaseLiabilityToBePaidYearFourAndFive" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Lease and License Obligations 3-5 years</link:label>
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    <link:label id="lab_htgc_LesseeOperatingLeaseLiabilityToBePaidYearFourAndFive_documentation_en-US" xlink:label="lab_htgc_LesseeOperatingLeaseLiabilityToBePaidYearFourAndFive" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in fifth fiscal year following Third fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_LesseeOperatingLeaseLiabilityToBePaidYearFourAndFive" xlink:href="htgc-20231231.xsd#htgc_LesseeOperatingLeaseLiabilityToBePaidYearFourAndFive"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_LesseeOperatingLeaseLiabilityToBePaidYearFourAndFive" xlink:to="lab_htgc_LesseeOperatingLeaseLiabilityToBePaidYearFourAndFive" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_IncomeTaxDisclosureAbstract_890c774e-6e9d-41b4-883f-855197c8eed2_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxDisclosureAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Income Tax Disclosure [Abstract]</link:label>
    <link:label id="lab_us-gaap_IncomeTaxDisclosureAbstract_label_en-US" xlink:label="lab_us-gaap_IncomeTaxDisclosureAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Income Tax Disclosure [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxDisclosureAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxDisclosureAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract" xlink:to="lab_us-gaap_IncomeTaxDisclosureAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_OtherLiabilityClassifiedAwardsMember_8deef7c5-b24e-4e9d-95cf-9706936a4709_terseLabel_en-US" xlink:label="lab_htgc_OtherLiabilityClassifiedAwardsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other Liability Classified Awards</link:label>
    <link:label id="lab_htgc_OtherLiabilityClassifiedAwardsMember_label_en-US" xlink:label="lab_htgc_OtherLiabilityClassifiedAwardsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other Liability Classified Awards [Member]</link:label>
    <link:label id="lab_htgc_OtherLiabilityClassifiedAwardsMember_documentation_en-US" xlink:label="lab_htgc_OtherLiabilityClassifiedAwardsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other Liability Classified Awards</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_OtherLiabilityClassifiedAwardsMember" xlink:href="htgc-20231231.xsd#htgc_OtherLiabilityClassifiedAwardsMember"/>
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    <link:label id="lab_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_3fc6f46f-4026-4671-a121-e3c93fddb6c5_terseLabel_en-US" xlink:label="lab_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share-Based Payment Arrangement [Abstract]</link:label>
    <link:label id="lab_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_label_en-US" xlink:label="lab_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share-Based Payment Arrangement [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract" xlink:to="lab_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LineOfCreditFacilityCovenantTerms_54fdff43-fe55-4ac1-b63d-f435f99dc0b9_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityCovenantTerms" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Line of credit facility, covenant terms</link:label>
    <link:label id="lab_us-gaap_LineOfCreditFacilityCovenantTerms_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityCovenantTerms" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Line of Credit Facility, Covenant Terms</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityCovenantTerms" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LineOfCreditFacilityCovenantTerms"/>
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    <link:label id="lab_dei_EntityTaxIdentificationNumber_bbc707e6-b58d-42d0-91e8-5e21fed55bd8_terseLabel_en-US" xlink:label="lab_dei_EntityTaxIdentificationNumber" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Tax Identification Number</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityTaxIdentificationNumber"/>
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    <link:label id="lab_htgc_AssetBackedNotes2028Member_label_en-US" xlink:label="lab_htgc_AssetBackedNotes2028Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Asset-Backed Notes 2028 [Member]</link:label>
    <link:label id="lab_htgc_AssetBackedNotes2028Member_documentation_en-US" xlink:label="lab_htgc_AssetBackedNotes2028Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Asset-Backed Notes 2028 [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_AssetBackedNotes2028Member" xlink:href="htgc-20231231.xsd#htgc_AssetBackedNotes2028Member"/>
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    <link:label id="lab_srt_RangeAxis_c65b29ae-564c-4791-95e1-8cfc0bb1a367_terseLabel_en-US" xlink:label="lab_srt_RangeAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Statistical Measurement</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" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Statistical Measurement [Axis]</link:label>
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    <link:label id="lab_us-gaap_BalanceSheetLocationDomain_ef17e078-efb9-4c3b-9fd3-b09755aafe57_terseLabel_en-US" xlink:label="lab_us-gaap_BalanceSheetLocationDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Balance Sheet Location [Domain]</link:label>
    <link:label id="lab_us-gaap_BalanceSheetLocationDomain_label_en-US" xlink:label="lab_us-gaap_BalanceSheetLocationDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Balance Sheet Location [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BalanceSheetLocationDomain" xlink:to="lab_us-gaap_BalanceSheetLocationDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_InvestmentCompanyDividendDistribution_baad4b8a-52f0-4d87-926f-85efb2f3f4c8_negatedLabel_en-US" xlink:label="lab_us-gaap_InvestmentCompanyDividendDistribution" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Distributions</link:label>
    <link:label id="lab_us-gaap_InvestmentCompanyDividendDistribution_751bd5bd-c2fd-4cd7-aa1b-a87a6ea4723f_verboseLabel_en-US" xlink:label="lab_us-gaap_InvestmentCompanyDividendDistribution" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total Amount</link:label>
    <link:label id="lab_us-gaap_InvestmentCompanyDividendDistribution_cd3a39a9-34be-4504-913c-3dd60cd09c3a_terseLabel_en-US" xlink:label="lab_us-gaap_InvestmentCompanyDividendDistribution" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Distributions</link:label>
    <link:label id="lab_us-gaap_InvestmentCompanyDividendDistribution_label_en-US" xlink:label="lab_us-gaap_InvestmentCompanyDividendDistribution" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investment Company, Dividend Distribution</link:label>
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    <link:label id="lab_us-gaap_OperatingLeasePayments_159401ac-40d5-487e-b5be-fedd48f26b39_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasePayments" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cash paid for amounts included in the measurement of lease liabilities</link:label>
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    <link:label id="lab_htgc_SeniorSecuredDebtTwoMember_93e00f02-13ce-42e5-bc35-b05181424133_terseLabel_en-US" xlink:label="lab_htgc_SeniorSecuredDebtTwoMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Senior Secured Debt Two</link:label>
    <link:label id="lab_htgc_SeniorSecuredDebtTwoMember_label_en-US" xlink:label="lab_htgc_SeniorSecuredDebtTwoMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Senior Secured Debt Two [Member]</link:label>
    <link:label id="lab_htgc_SeniorSecuredDebtTwoMember_documentation_en-US" xlink:label="lab_htgc_SeniorSecuredDebtTwoMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Senior Secured Debt Two</link:label>
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    <link:label id="lab_htgc_DividendDeclaredEightMember_6e3b98d8-1a26-42fd-a7ed-2bb6fa2d32ab_terseLabel_en-US" xlink:label="lab_htgc_DividendDeclaredEightMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Dividend Declared Eight</link:label>
    <link:label id="lab_htgc_DividendDeclaredEightMember_label_en-US" xlink:label="lab_htgc_DividendDeclaredEightMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Dividend Declared Eight [Member]</link:label>
    <link:label id="lab_htgc_DividendDeclaredEightMember_documentation_en-US" xlink:label="lab_htgc_DividendDeclaredEightMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Dividend Declared Eight [Member]</link:label>
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    <link:label id="lab_us-gaap_CommonStockSharesOutstanding_f8a60b7d-0567-4013-aa20-1938ca13d648_terseLabel_en-US" xlink:label="lab_us-gaap_CommonStockSharesOutstanding" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Common stock outstanding ($.001 par value and 200,000 authorized) (in shares)</link:label>
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    <link:label id="lab_us-gaap_CommonStockSharesOutstanding_d9e0f78a-1ac8-4a05-be6d-26c405ba1fb7_periodEndLabel_en-US" xlink:label="lab_us-gaap_CommonStockSharesOutstanding" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Ending balance (in shares)</link:label>
    <link:label id="lab_us-gaap_CommonStockSharesOutstanding_87df1d7d-6af9-46e0-8c9c-7174674ee485_verboseLabel_en-US" xlink:label="lab_us-gaap_CommonStockSharesOutstanding" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Common stock outstanding (in shares)</link:label>
    <link:label id="lab_us-gaap_CommonStockSharesOutstanding_label_en-US" xlink:label="lab_us-gaap_CommonStockSharesOutstanding" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Common Stock, Shares, Outstanding</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CommonStockSharesOutstanding" xlink:to="lab_us-gaap_CommonStockSharesOutstanding" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_HtgcDebtAndEquitySecuritiesRealizedGainLossMember_e46271d9-f9ce-4d23-9a11-a3e2f4e6d60c_terseLabel_en-US" xlink:label="lab_htgc_HtgcDebtAndEquitySecuritiesRealizedGainLossMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">HTGC Debt And Equity Securities Realized Gain Loss</link:label>
    <link:label id="lab_htgc_HtgcDebtAndEquitySecuritiesRealizedGainLossMember_label_en-US" xlink:label="lab_htgc_HtgcDebtAndEquitySecuritiesRealizedGainLossMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">HTGC Debt And Equity Securities Realized Gain Loss [Member]</link:label>
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    <link:label id="lab_dei_AuditorLocation_f66bf706-0b07-4312-8c2f-9526f1048306_terseLabel_en-US" xlink:label="lab_dei_AuditorLocation" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" 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/2023/dei-2023.xsd#dei_AuditorLocation"/>
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    <link:label id="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationOtherLongtermIncentivePlansRequisiteServicePeriodRecognition_fd92e86c-a6ae-437d-83cb-4c7d5d16f8df_terseLabel_en-US" xlink:label="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationOtherLongtermIncentivePlansRequisiteServicePeriodRecognition" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Restricted stock and option expense related to director compensation</link:label>
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    <link:label id="lab_htgc_ForbionGrowthOpportunitiesFundICVMember_d92b4cfe-f4c5-4178-a891-3eab840d2a60_terseLabel_en-US" xlink:label="lab_htgc_ForbionGrowthOpportunitiesFundICVMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Forbion Growth Opportunities Fund I C.V.</link:label>
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    <link:label id="lab_us-gaap_SharesOutstanding_24cdb204-3d9a-433e-b7c2-0fae4c1700be_terseLabel_en-US" xlink:label="lab_us-gaap_SharesOutstanding" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Shares outstanding at end of period (in shares)</link:label>
    <link:label id="lab_us-gaap_SharesOutstanding_label_en-US" xlink:label="lab_us-gaap_SharesOutstanding" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Shares, Outstanding</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesOutstanding" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharesOutstanding"/>
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    <link:label id="lab_htgc_InvestmentsHeldByNumberOfCompanies_35f6bbbe-49ae-403f-8ef9-6bd0f957c4ea_terseLabel_en-US" xlink:label="lab_htgc_InvestmentsHeldByNumberOfCompanies" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investments held by number of companies</link:label>
    <link:label id="lab_htgc_InvestmentsHeldByNumberOfCompanies_label_en-US" xlink:label="lab_htgc_InvestmentsHeldByNumberOfCompanies" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investments Held By Number Of Companies</link:label>
    <link:label id="lab_htgc_InvestmentsHeldByNumberOfCompanies_documentation_en-US" xlink:label="lab_htgc_InvestmentsHeldByNumberOfCompanies" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investments held by number of companies.</link:label>
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    <link:label id="lab_htgc_HilleVaxIncMember_c3721b13-9b43-455e-8b17-3a1d5a77523f_terseLabel_en-US" xlink:label="lab_htgc_HilleVaxIncMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">HilleVax, Inc.</link:label>
    <link:label id="lab_htgc_HilleVaxIncMember_label_en-US" xlink:label="lab_htgc_HilleVaxIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Hille Vax Inc [Member]</link:label>
    <link:label id="lab_htgc_HilleVaxIncMember_documentation_en-US" xlink:label="lab_htgc_HilleVaxIncMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">HilleVax, Inc.</link:label>
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    <link:label id="lab_htgc_CommonGrossProceedsMember_7958c24e-b560-4373-8c68-9358b4ab4ba8_terseLabel_en-US" xlink:label="lab_htgc_CommonGrossProceedsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Common - Gross Proceeds</link:label>
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    <link:label id="lab_htgc_CommonGrossProceedsMember_documentation_en-US" xlink:label="lab_htgc_CommonGrossProceedsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Common - Gross Proceeds</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_CommonGrossProceedsMember" xlink:href="htgc-20231231.xsd#htgc_CommonGrossProceedsMember"/>
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    <link:label id="lab_htgc_OtherInterestIncomeMember_bab89ede-5124-4472-a9c0-032f50d7c326_terseLabel_en-US" xlink:label="lab_htgc_OtherInterestIncomeMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other investment income</link:label>
    <link:label id="lab_htgc_OtherInterestIncomeMember_label_en-US" xlink:label="lab_htgc_OtherInterestIncomeMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other Interest Income [Member]</link:label>
    <link:label id="lab_htgc_OtherInterestIncomeMember_documentation_en-US" xlink:label="lab_htgc_OtherInterestIncomeMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other Interest Income [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_OtherInterestIncomeMember" xlink:href="htgc-20231231.xsd#htgc_OtherInterestIncomeMember"/>
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    <link:label id="lab_us-gaap_CommonStockParOrStatedValuePerShare_5a51d002-7316-4979-a437-9a0021fbaec2_terseLabel_en-US" xlink:label="lab_us-gaap_CommonStockParOrStatedValuePerShare" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Common stock, par value</link:label>
    <link:label id="lab_us-gaap_CommonStockParOrStatedValuePerShare_label_en-US" xlink:label="lab_us-gaap_CommonStockParOrStatedValuePerShare" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Common Stock, Par or Stated Value Per Share</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockParOrStatedValuePerShare"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CommonStockParOrStatedValuePerShare" xlink:to="lab_us-gaap_CommonStockParOrStatedValuePerShare" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_AssetBackedNotes2031Member_label_en-US" xlink:label="lab_htgc_AssetBackedNotes2031Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Asset-Backed Notes 2031 [Member]</link:label>
    <link:label id="lab_htgc_AssetBackedNotes2031Member_documentation_en-US" xlink:label="lab_htgc_AssetBackedNotes2031Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Asset-Backed Notes 2031 [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_AssetBackedNotes2031Member" xlink:href="htgc-20231231.xsd#htgc_AssetBackedNotes2031Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_AssetBackedNotes2031Member" xlink:to="lab_htgc_AssetBackedNotes2031Member" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_cf9021b3-d2c8-43c0-84f6-91cd690c5802_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Net cash (used in) investing activities</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Net Cash Provided by (Used in) Investing Activities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:to="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_TaxesPayableCurrentAndNoncurrent_31ffd50a-0429-4d06-b22b-c96cecf630c3_terseLabel_en-US" xlink:label="lab_us-gaap_TaxesPayableCurrentAndNoncurrent" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Taxes payable</link:label>
    <link:label id="lab_us-gaap_TaxesPayableCurrentAndNoncurrent_label_en-US" xlink:label="lab_us-gaap_TaxesPayableCurrentAndNoncurrent" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Taxes Payable</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxesPayableCurrentAndNoncurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TaxesPayableCurrentAndNoncurrent"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_TaxesPayableCurrentAndNoncurrent" xlink:to="lab_us-gaap_TaxesPayableCurrentAndNoncurrent" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DebtInstrumentAxis_da511520-1479-43f2-aa59-e00543d589ee_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Debt Instrument</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentAxis" xlink:to="lab_us-gaap_DebtInstrumentAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_country_DE_7239377b-3214-46ff-98d4-39a07f38d8c7_terseLabel_en-US" xlink:label="lab_country_DE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Germany</link:label>
    <link:label id="lab_country_DE_label_en-US" xlink:label="lab_country_DE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">GERMANY</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_country_DE" xlink:href="https://xbrl.sec.gov/country/2023/country-2023.xsd#country_DE"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_country_DE" xlink:to="lab_country_DE" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_InvestmentHoldingsScheduleOfInvestmentsTextBlock_13249c4e-7427-4014-897a-a292d58c08dd_terseLabel_en-US" xlink:label="lab_us-gaap_InvestmentHoldingsScheduleOfInvestmentsTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investments</link:label>
    <link:label id="lab_us-gaap_InvestmentHoldingsScheduleOfInvestmentsTextBlock_label_en-US" xlink:label="lab_us-gaap_InvestmentHoldingsScheduleOfInvestmentsTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Investments [Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentHoldingsScheduleOfInvestmentsTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InvestmentHoldingsScheduleOfInvestmentsTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InvestmentHoldingsScheduleOfInvestmentsTextBlock" xlink:to="lab_us-gaap_InvestmentHoldingsScheduleOfInvestmentsTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_StockRepurchasedAndRetiredDuringPeriodValue_c7a904a7-e04d-4ce7-bb2b-22dd5aedfc3d_negatedLabel_en-US" xlink:label="lab_us-gaap_StockRepurchasedAndRetiredDuringPeriodValue" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Shares retired on vesting of equity-based awards</link:label>
    <link:label id="lab_us-gaap_StockRepurchasedAndRetiredDuringPeriodValue_label_en-US" xlink:label="lab_us-gaap_StockRepurchasedAndRetiredDuringPeriodValue" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Stock Repurchased and Retired During Period, Value</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodValue" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockRepurchasedAndRetiredDuringPeriodValue"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodValue" xlink:to="lab_us-gaap_StockRepurchasedAndRetiredDuringPeriodValue" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_RepaymentsOfDebt_45f7a3be-8745-4720-a060-1e13d276ac5e_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_RepaymentsOfDebt" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Repayment of debt</link:label>
    <link:label id="lab_us-gaap_RepaymentsOfDebt_label_en-US" xlink:label="lab_us-gaap_RepaymentsOfDebt" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Repayments of Debt</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfDebt" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RepaymentsOfDebt"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RepaymentsOfDebt" xlink:to="lab_us-gaap_RepaymentsOfDebt" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_MacroFabIncMember_9307c61c-78cc-4cae-a2f4-c7bdf631b1d7_terseLabel_en-US" xlink:label="lab_htgc_MacroFabIncMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">MacroFab, Inc.</link:label>
    <link:label id="lab_htgc_MacroFabIncMember_label_en-US" xlink:label="lab_htgc_MacroFabIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">MacroFab, Inc. [Member]</link:label>
    <link:label id="lab_htgc_MacroFabIncMember_documentation_en-US" xlink:label="lab_htgc_MacroFabIncMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">MacroFab, Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_MacroFabIncMember" xlink:href="htgc-20231231.xsd#htgc_MacroFabIncMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_MacroFabIncMember" xlink:to="lab_htgc_MacroFabIncMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_MeasurementInputTypeDomain_e5a53996-da3a-451b-9164-845b0139f580_terseLabel_en-US" xlink:label="lab_us-gaap_MeasurementInputTypeDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Measurement Input Type</link:label>
    <link:label id="lab_us-gaap_MeasurementInputTypeDomain_label_en-US" xlink:label="lab_us-gaap_MeasurementInputTypeDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Measurement Input Type [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_MeasurementInputTypeDomain" xlink:to="lab_us-gaap_MeasurementInputTypeDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_country_DK_831cf0b4-752e-4006-9aaf-fc208098cce3_terseLabel_en-US" xlink:label="lab_country_DK" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" 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" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">DENMARK</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_country_DK" xlink:href="https://xbrl.sec.gov/country/2023/country-2023.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_us-gaap_CreditFacilityAxis_7fddc718-7535-460e-b097-90a0ca039b22_terseLabel_en-US" xlink:label="lab_us-gaap_CreditFacilityAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Credit Facility</link:label>
    <link:label id="lab_us-gaap_CreditFacilityAxis_label_en-US" xlink:label="lab_us-gaap_CreditFacilityAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Credit Facility [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CreditFacilityAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CreditFacilityAxis" xlink:to="lab_us-gaap_CreditFacilityAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_Liabilities_dc9d6af5-d973-4860-9321-cf818a355d2b_totalLabel_en-US" xlink:label="lab_us-gaap_Liabilities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total liabilities</link:label>
    <link:label id="lab_us-gaap_Liabilities_label_en-US" xlink:label="lab_us-gaap_Liabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_Liabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_Liabilities" xlink:to="lab_us-gaap_Liabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_SBADebenturesIssuedOnNovemberOneTwoThousandAndTwentyOneMember_62df307d-3167-4210-8800-aa6f5c06e532_terseLabel_en-US" xlink:label="lab_htgc_SBADebenturesIssuedOnNovemberOneTwoThousandAndTwentyOneMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">SBA Debentures Issued on November 1, 2021</link:label>
    <link:label id="lab_htgc_SBADebenturesIssuedOnNovemberOneTwoThousandAndTwentyOneMember_label_en-US" xlink:label="lab_htgc_SBADebenturesIssuedOnNovemberOneTwoThousandAndTwentyOneMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">S B A Debentures Issued On November One Two Thousand And Twenty One [Member]</link:label>
    <link:label id="lab_htgc_SBADebenturesIssuedOnNovemberOneTwoThousandAndTwentyOneMember_documentation_en-US" xlink:label="lab_htgc_SBADebenturesIssuedOnNovemberOneTwoThousandAndTwentyOneMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">SBA debentures issued on november one, two thousand and twenty one.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_SBADebenturesIssuedOnNovemberOneTwoThousandAndTwentyOneMember" xlink:href="htgc-20231231.xsd#htgc_SBADebenturesIssuedOnNovemberOneTwoThousandAndTwentyOneMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_SBADebenturesIssuedOnNovemberOneTwoThousandAndTwentyOneMember" xlink:to="lab_htgc_SBADebenturesIssuedOnNovemberOneTwoThousandAndTwentyOneMember" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_OperatingExpensesNet_a1f109cc-f6ad-4ac5-9eb4-8036b3798296_totalLabel_en-US" xlink:label="lab_htgc_OperatingExpensesNet" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total net operating expenses</link:label>
    <link:label id="lab_htgc_OperatingExpensesNet_label_en-US" xlink:label="lab_htgc_OperatingExpensesNet" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Operating Expenses, Net</link:label>
    <link:label id="lab_htgc_OperatingExpensesNet_documentation_en-US" xlink:label="lab_htgc_OperatingExpensesNet" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense. Net of allocations to the Adviser Subsidiary.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_OperatingExpensesNet" xlink:href="htgc-20231231.xsd#htgc_OperatingExpensesNet"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_OperatingExpensesNet" xlink:to="lab_htgc_OperatingExpensesNet" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_LoftwareIncMember_8140a545-6443-46d3-ad37-7d509c33c74f_terseLabel_en-US" xlink:label="lab_htgc_LoftwareIncMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Loftware, Inc.</link:label>
    <link:label id="lab_htgc_LoftwareIncMember_label_en-US" xlink:label="lab_htgc_LoftwareIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Loftware, Inc [Member]</link:label>
    <link:label id="lab_htgc_LoftwareIncMember_documentation_en-US" xlink:label="lab_htgc_LoftwareIncMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Loftware, Inc [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_LoftwareIncMember" xlink:href="htgc-20231231.xsd#htgc_LoftwareIncMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_LoftwareIncMember" xlink:to="lab_htgc_LoftwareIncMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_FairValueMeasurementFrequencyDomain_739ccb56-e5ff-4304-b3d0-7aa6d88ec1f4_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueMeasurementFrequencyDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Measurement Frequency</link:label>
    <link:label id="lab_us-gaap_FairValueMeasurementFrequencyDomain_label_en-US" xlink:label="lab_us-gaap_FairValueMeasurementFrequencyDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Measurement Frequency [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain" xlink:to="lab_us-gaap_FairValueMeasurementFrequencyDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_NewRelicIncMember_377eba10-d041-46d3-adf2-e95305667175_terseLabel_en-US" xlink:label="lab_htgc_NewRelicIncMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">New Relic, Inc.</link:label>
    <link:label id="lab_htgc_NewRelicIncMember_label_en-US" xlink:label="lab_htgc_NewRelicIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">New Relic, Inc [Member]</link:label>
    <link:label id="lab_htgc_NewRelicIncMember_documentation_en-US" xlink:label="lab_htgc_NewRelicIncMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">New Relic, Inc</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_NewRelicIncMember" xlink:href="htgc-20231231.xsd#htgc_NewRelicIncMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_NewRelicIncMember" xlink:to="lab_htgc_NewRelicIncMember" xlink:type="arc" order="1"/>
    <link:label id="lab_country_CA_f7345d4f-52a1-40bf-8098-b05549475771_terseLabel_en-US" xlink:label="lab_country_CA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Canada</link:label>
    <link:label id="lab_country_CA_label_en-US" xlink:label="lab_country_CA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">CANADA</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_country_CA" xlink:href="https://xbrl.sec.gov/country/2023/country-2023.xsd#country_CA"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_country_CA" xlink:to="lab_country_CA" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_ValuationTechniqueLiquidationMember_01ae2991-cea3-4d5f-a161-0bb20c785e07_terseLabel_en-US" xlink:label="lab_htgc_ValuationTechniqueLiquidationMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Liquidation</link:label>
    <link:label id="lab_htgc_ValuationTechniqueLiquidationMember_label_en-US" xlink:label="lab_htgc_ValuationTechniqueLiquidationMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Valuation Technique Liquidation [Member]</link:label>
    <link:label id="lab_htgc_ValuationTechniqueLiquidationMember_documentation_en-US" xlink:label="lab_htgc_ValuationTechniqueLiquidationMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Valuation technique, liquidation.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_ValuationTechniqueLiquidationMember" xlink:href="htgc-20231231.xsd#htgc_ValuationTechniqueLiquidationMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_ValuationTechniqueLiquidationMember" xlink:to="lab_htgc_ValuationTechniqueLiquidationMember" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_ViridianTherapeuticsIncMember_455bbd6b-a5ed-4394-8528-09da94646fab_terseLabel_en-US" xlink:label="lab_htgc_ViridianTherapeuticsIncMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Viridian Therapeutics, Inc.</link:label>
    <link:label id="lab_htgc_ViridianTherapeuticsIncMember_label_en-US" xlink:label="lab_htgc_ViridianTherapeuticsIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Viridian Therapeutics Inc [Member]</link:label>
    <link:label id="lab_htgc_ViridianTherapeuticsIncMember_documentation_en-US" xlink:label="lab_htgc_ViridianTherapeuticsIncMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Viridian Therapeutics, Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_ViridianTherapeuticsIncMember" xlink:href="htgc-20231231.xsd#htgc_ViridianTherapeuticsIncMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_ViridianTherapeuticsIncMember" xlink:to="lab_htgc_ViridianTherapeuticsIncMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_SubsequentEventLineItems_4e15bd6b-8ad4-40d4-95dd-f960aaae5f04_terseLabel_en-US" xlink:label="lab_us-gaap_SubsequentEventLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subsequent Event [Line Items]</link:label>
    <link:label id="lab_us-gaap_SubsequentEventLineItems_label_en-US" xlink:label="lab_us-gaap_SubsequentEventLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subsequent Event [Line Items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventLineItems" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SubsequentEventLineItems" xlink:to="lab_us-gaap_SubsequentEventLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_PlentificLtdMember_a838305a-0638-456a-b0ce-7b049643bf4f_terseLabel_en-US" xlink:label="lab_htgc_PlentificLtdMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Plentific Ltd</link:label>
    <link:label id="lab_htgc_PlentificLtdMember_label_en-US" xlink:label="lab_htgc_PlentificLtdMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Plentific Ltd [Member]</link:label>
    <link:label id="lab_htgc_PlentificLtdMember_documentation_en-US" xlink:label="lab_htgc_PlentificLtdMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Plentific Ltd</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_PlentificLtdMember" xlink:href="htgc-20231231.xsd#htgc_PlentificLtdMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_PlentificLtdMember" xlink:to="lab_htgc_PlentificLtdMember" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_ThreeMonthSecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember_e0810f19-4ce0-40c9-912c-44c42cd04d50_terseLabel_en-US" xlink:label="lab_htgc_ThreeMonthSecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">3-month SOFR</link:label>
    <link:label id="lab_htgc_ThreeMonthSecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember_label_en-US" xlink:label="lab_htgc_ThreeMonthSecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Three Month Secured Overnight Financing Rate Sofr Overnight Index Swap Rate [Member]</link:label>
    <link:label id="lab_htgc_ThreeMonthSecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember_documentation_en-US" xlink:label="lab_htgc_ThreeMonthSecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Three month secured overnight financing rate sofr overnight index swap rate member.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_ThreeMonthSecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember" xlink:href="htgc-20231231.xsd#htgc_ThreeMonthSecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_ThreeMonthSecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember" xlink:to="lab_htgc_ThreeMonthSecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_EmployeeBenefitsAndShareBasedCompensation_d8412afe-ee03-4046-980f-3f927b28cb5f_terseLabel_en-US" xlink:label="lab_us-gaap_EmployeeBenefitsAndShareBasedCompensation" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Stock-based compensation</link:label>
    <link:label id="lab_us-gaap_EmployeeBenefitsAndShareBasedCompensation_label_en-US" xlink:label="lab_us-gaap_EmployeeBenefitsAndShareBasedCompensation" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Employee Benefits and Share-Based Compensation</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeBenefitsAndShareBasedCompensation" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeBenefitsAndShareBasedCompensation"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EmployeeBenefitsAndShareBasedCompensation" xlink:to="lab_us-gaap_EmployeeBenefitsAndShareBasedCompensation" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_GeneralAndAdministrativeExpense_743e7aa2-eca9-43f5-a9c0-06f2e77ae24b_terseLabel_en-US" xlink:label="lab_us-gaap_GeneralAndAdministrativeExpense" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">General and administrative</link:label>
    <link:label id="lab_us-gaap_GeneralAndAdministrativeExpense_label_en-US" xlink:label="lab_us-gaap_GeneralAndAdministrativeExpense" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">General and Administrative Expense</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpense" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GeneralAndAdministrativeExpense"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_GeneralAndAdministrativeExpense" xlink:to="lab_us-gaap_GeneralAndAdministrativeExpense" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_PreferredSeriesBBMember_db43f4d8-7ba0-43a0-9d65-0311a4399742_terseLabel_en-US" xlink:label="lab_htgc_PreferredSeriesBBMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Preferred Series BB</link:label>
    <link:label id="lab_htgc_PreferredSeriesBBMember_label_en-US" xlink:label="lab_htgc_PreferredSeriesBBMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Preferred Series B B [Member]</link:label>
    <link:label id="lab_htgc_PreferredSeriesBBMember_documentation_en-US" xlink:label="lab_htgc_PreferredSeriesBBMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Preferred Series BB.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_PreferredSeriesBBMember" xlink:href="htgc-20231231.xsd#htgc_PreferredSeriesBBMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_PreferredSeriesBBMember" xlink:to="lab_htgc_PreferredSeriesBBMember" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_ConsumerAndBusinessServicesMember_eb0170e9-e911-475d-8d5a-c0821d2f5b5d_terseLabel_en-US" xlink:label="lab_htgc_ConsumerAndBusinessServicesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Consumer &amp; Business Services</link:label>
    <link:label id="lab_htgc_ConsumerAndBusinessServicesMember_label_en-US" xlink:label="lab_htgc_ConsumerAndBusinessServicesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Consumer And Business Services [Member]</link:label>
    <link:label id="lab_htgc_ConsumerAndBusinessServicesMember_documentation_en-US" xlink:label="lab_htgc_ConsumerAndBusinessServicesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Consumer &amp; Business Services.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_ConsumerAndBusinessServicesMember" xlink:href="htgc-20231231.xsd#htgc_ConsumerAndBusinessServicesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_ConsumerAndBusinessServicesMember" xlink:to="lab_htgc_ConsumerAndBusinessServicesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_RoyaltyContractMember_12e4eebb-ac73-4317-a076-589fb3d2f811_terseLabel_en-US" xlink:label="lab_htgc_RoyaltyContractMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Royalty Contract</link:label>
    <link:label id="lab_htgc_RoyaltyContractMember_label_en-US" xlink:label="lab_htgc_RoyaltyContractMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Royalty Contract [Member]</link:label>
    <link:label id="lab_htgc_RoyaltyContractMember_documentation_en-US" xlink:label="lab_htgc_RoyaltyContractMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Royalty Contract Member</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_RoyaltyContractMember" xlink:href="htgc-20231231.xsd#htgc_RoyaltyContractMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_RoyaltyContractMember" xlink:to="lab_htgc_RoyaltyContractMember" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_AcceleratedFeeIncomeExpiredCommitmentsMember_5548d0d2-0e56-4665-bf3b-0b68845eb6e3_terseLabel_en-US" xlink:label="lab_htgc_AcceleratedFeeIncomeExpiredCommitmentsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Fee income - expired commitments</link:label>
    <link:label id="lab_htgc_AcceleratedFeeIncomeExpiredCommitmentsMember_label_en-US" xlink:label="lab_htgc_AcceleratedFeeIncomeExpiredCommitmentsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accelerated Fee Income - Expired Commitments [Member]</link:label>
    <link:label id="lab_htgc_AcceleratedFeeIncomeExpiredCommitmentsMember_documentation_en-US" xlink:label="lab_htgc_AcceleratedFeeIncomeExpiredCommitmentsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accelerated Fee Income - Expired Commitments [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_AcceleratedFeeIncomeExpiredCommitmentsMember" xlink:href="htgc-20231231.xsd#htgc_AcceleratedFeeIncomeExpiredCommitmentsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_AcceleratedFeeIncomeExpiredCommitmentsMember" xlink:to="lab_htgc_AcceleratedFeeIncomeExpiredCommitmentsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_SegmentReportingPolicyPolicyTextBlock_e1c7beb7-9925-481d-b2ac-2423405a1044_terseLabel_en-US" xlink:label="lab_us-gaap_SegmentReportingPolicyPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Segments</link:label>
    <link:label id="lab_us-gaap_SegmentReportingPolicyPolicyTextBlock_label_en-US" xlink:label="lab_us-gaap_SegmentReportingPolicyPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Segment Reporting, Policy [Policy Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingPolicyPolicyTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentReportingPolicyPolicyTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SegmentReportingPolicyPolicyTextBlock" xlink:to="lab_us-gaap_SegmentReportingPolicyPolicyTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_PreferredStockMember_ccc1794c-7d2f-4784-b4d7-a7779fb3ebea_terseLabel_en-US" xlink:label="lab_us-gaap_PreferredStockMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Preferred Stock</link:label>
    <link:label id="lab_us-gaap_PreferredStockMember_label_en-US" xlink:label="lab_us-gaap_PreferredStockMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Preferred Stock [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockMember" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PreferredStockMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PreferredStockMember" xlink:to="lab_us-gaap_PreferredStockMember" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_AcceleratedFeeIncomeEarlyRepaymentsMember_ae16c162-6ffa-44a3-8228-346ceead53af_terseLabel_en-US" xlink:label="lab_htgc_AcceleratedFeeIncomeEarlyRepaymentsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accelerated fee income - early repayments</link:label>
    <link:label id="lab_htgc_AcceleratedFeeIncomeEarlyRepaymentsMember_label_en-US" xlink:label="lab_htgc_AcceleratedFeeIncomeEarlyRepaymentsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accelerated Fee Income - Early Repayments [Member]</link:label>
    <link:label id="lab_htgc_AcceleratedFeeIncomeEarlyRepaymentsMember_documentation_en-US" xlink:label="lab_htgc_AcceleratedFeeIncomeEarlyRepaymentsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accelerated Fee Income - Early Repayments [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_AcceleratedFeeIncomeEarlyRepaymentsMember" xlink:href="htgc-20231231.xsd#htgc_AcceleratedFeeIncomeEarlyRepaymentsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_AcceleratedFeeIncomeEarlyRepaymentsMember" xlink:to="lab_htgc_AcceleratedFeeIncomeEarlyRepaymentsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_EquitySecuritiesMember_20dc929a-4582-4094-afb2-f31b0132c657_terseLabel_en-US" xlink:label="lab_us-gaap_EquitySecuritiesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Equity Securities</link:label>
    <link:label id="lab_us-gaap_EquitySecuritiesMember_label_en-US" xlink:label="lab_us-gaap_EquitySecuritiesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Equity Securities [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesMember" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquitySecuritiesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EquitySecuritiesMember" xlink:to="lab_us-gaap_EquitySecuritiesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_UnfundedCommitmentsDueInOneYear_81c8590a-6fab-4418-b988-49ed9d75bf9b_terseLabel_en-US" xlink:label="lab_htgc_UnfundedCommitmentsDueInOneYear" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">2024</link:label>
    <link:label id="lab_htgc_UnfundedCommitmentsDueInOneYear_label_en-US" xlink:label="lab_htgc_UnfundedCommitmentsDueInOneYear" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Unfunded Commitments Due In One Year</link:label>
    <link:label id="lab_htgc_UnfundedCommitmentsDueInOneYear_documentation_en-US" xlink:label="lab_htgc_UnfundedCommitmentsDueInOneYear" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Unfunded commitments due within one year.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_UnfundedCommitmentsDueInOneYear" xlink:href="htgc-20231231.xsd#htgc_UnfundedCommitmentsDueInOneYear"/>
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    <link:label id="lab_us-gaap_EarningsPerSharePolicyTextBlock_b49e8a20-b063-48e8-9512-0a7a3d2a6379_terseLabel_en-US" xlink:label="lab_us-gaap_EarningsPerSharePolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Earnings Per Share (&#8220;EPS&#8221;)</link:label>
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    <link:label id="lab_htgc_WeAreSubjectToRisksRelatedToCorporateSocialResponsibilityMember_label_en-US" xlink:label="lab_htgc_WeAreSubjectToRisksRelatedToCorporateSocialResponsibilityMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">We are subject to risks related to corporate social responsibility [Member]</link:label>
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    <link:label id="lab_us-gaap_ConcentrationRiskPercentage1_60d013d1-e255-4d63-bde3-eb10a4e5c303_verboseLabel_en-US" xlink:label="lab_us-gaap_ConcentrationRiskPercentage1" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Percentage of Total Portfolio</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsForPurchaseOfInvestmentOperatingActivity" xlink:to="lab_us-gaap_PaymentsForPurchaseOfInvestmentOperatingActivity" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_PineappleEnergyLLCMember_86a8440e-be7a-47f2-bd8a-3848100e417d_terseLabel_en-US" xlink:label="lab_htgc_PineappleEnergyLLCMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Pineapple Energy LLC</link:label>
    <link:label id="lab_htgc_PineappleEnergyLLCMember_label_en-US" xlink:label="lab_htgc_PineappleEnergyLLCMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Pineapple Energy L L C [Member]</link:label>
    <link:label id="lab_htgc_PineappleEnergyLLCMember_documentation_en-US" xlink:label="lab_htgc_PineappleEnergyLLCMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Pineapple Energy LLC.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_PineappleEnergyLLCMember" xlink:href="htgc-20231231.xsd#htgc_PineappleEnergyLLCMember"/>
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    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_e4933703-67e0-446e-8789-473df13239b9_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Granted (in dollars per share)</link:label>
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    <link:label id="lab_us-gaap_DebtInstrumentPaymentTerms_627337b9-2f2b-4a77-b371-8cc7dca83940_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentPaymentTerms" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Debt instrument, payment terms, description</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentPaymentTerms_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentPaymentTerms" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Debt Instrument, Payment Terms</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentPaymentTerms" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentPaymentTerms"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentPaymentTerms" xlink:to="lab_us-gaap_DebtInstrumentPaymentTerms" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LongTermDebtAverageAmountOutstanding_7bdee949-e276-43ad-94b9-584c8788d459_terseLabel_en-US" xlink:label="lab_us-gaap_LongTermDebtAverageAmountOutstanding" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted average debt outstanding</link:label>
    <link:label id="lab_us-gaap_LongTermDebtAverageAmountOutstanding_label_en-US" xlink:label="lab_us-gaap_LongTermDebtAverageAmountOutstanding" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Long-Term Debt, Average Amount Outstanding</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAverageAmountOutstanding" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongTermDebtAverageAmountOutstanding"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LongTermDebtAverageAmountOutstanding" xlink:to="lab_us-gaap_LongTermDebtAverageAmountOutstanding" xlink:type="arc" order="1"/>
    <link:label id="lab_country_IE_437b6b14-8d00-4a9b-bb23-7de2e3860699_terseLabel_en-US" xlink:label="lab_country_IE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Ireland</link:label>
    <link:label id="lab_country_IE_label_en-US" xlink:label="lab_country_IE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">IRELAND</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_country_IE" xlink:href="https://xbrl.sec.gov/country/2023/country-2023.xsd#country_IE"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_country_IE" xlink:to="lab_country_IE" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_IncomeApproachValuationTechniqueMember_128009d3-d659-46bf-bf63-a8da60675618_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeApproachValuationTechniqueMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Income Approach</link:label>
    <link:label id="lab_us-gaap_IncomeApproachValuationTechniqueMember_label_en-US" xlink:label="lab_us-gaap_IncomeApproachValuationTechniqueMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Valuation, Income Approach [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeApproachValuationTechniqueMember" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeApproachValuationTechniqueMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeApproachValuationTechniqueMember" xlink:to="lab_us-gaap_IncomeApproachValuationTechniqueMember" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_SolarSpectrumHoldingsLLCMember_27042b79-c105-4a59-956a-113a4bb30b68_terseLabel_en-US" xlink:label="lab_htgc_SolarSpectrumHoldingsLLCMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Solar Spectrum Holdings LLC (p.k.a. Sungevity, Inc.)</link:label>
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    <link:label id="lab_htgc_SolarSpectrumHoldingsLLCMember_documentation_en-US" xlink:label="lab_htgc_SolarSpectrumHoldingsLLCMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Solar spectrum holdings LLC.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_SolarSpectrumHoldingsLLCMember" xlink:href="htgc-20231231.xsd#htgc_SolarSpectrumHoldingsLLCMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_SolarSpectrumHoldingsLLCMember" xlink:to="lab_htgc_SolarSpectrumHoldingsLLCMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_fcbc5763-caa7-45cf-80cb-ea6bf2d9d9f4_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Net cash provided by (used in) operating activities</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Net Cash Provided by (Used in) Operating Activities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:to="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_country_IL_3e607cce-0226-4590-9357-9a110f608692_terseLabel_en-US" xlink:label="lab_country_IL" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Israel</link:label>
    <link:label id="lab_country_IL_label_en-US" xlink:label="lab_country_IL" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">ISRAEL</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_country_IL" xlink:href="https://xbrl.sec.gov/country/2023/country-2023.xsd#country_IL"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_country_IL" xlink:to="lab_country_IL" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_RevenueRecognitionInterest_7fac528b-adb7-4ca4-b6b5-0d934b14ee8a_terseLabel_en-US" xlink:label="lab_us-gaap_RevenueRecognitionInterest" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investment Income Recognition</link:label>
    <link:label id="lab_us-gaap_RevenueRecognitionInterest_label_en-US" xlink:label="lab_us-gaap_RevenueRecognitionInterest" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Revenue Recognition, Interest [Policy Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRecognitionInterest" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueRecognitionInterest"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RevenueRecognitionInterest" xlink:to="lab_us-gaap_RevenueRecognitionInterest" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_StatementClassOfStockAxis_c099912c-883f-404f-b1c2-27bf633126f3_terseLabel_en-US" xlink:label="lab_us-gaap_StatementClassOfStockAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Class of Stock</link:label>
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    <link:label id="lab_htgc_CommitmentsAndContingenciesLineItems_c6e3af8f-6f1f-4ba2-a5ca-e52a713815f2_terseLabel_en-US" xlink:label="lab_htgc_CommitmentsAndContingenciesLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Commitments And Contingencies [Line Items]</link:label>
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    <link:label id="lab_htgc_MeasurementInputPremiumDiscountNettingMember_61fc8f70-9181-4deb-81de-bf2cd2dc92c2_terseLabel_en-US" xlink:label="lab_htgc_MeasurementInputPremiumDiscountNettingMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Premium/(Discount)</link:label>
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    <link:label id="lab_htgc_BlackCrowAIIncMember_18889f1d-0712-4006-bcfe-2c313f771253_terseLabel_en-US" xlink:label="lab_htgc_BlackCrowAIIncMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Black Crow AI, Inc.</link:label>
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    <link:label id="lab_us-gaap_InvestmentAffiliatedIssuerControlledMember_5d976d11-7eb1-4c5d-8980-4d67e31312b9_terseLabel_en-US" xlink:label="lab_us-gaap_InvestmentAffiliatedIssuerControlledMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Control investments</link:label>
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    <link:label id="lab_us-gaap_InvestmentInterestRatePaidInKind_29498a7a-c5f7-4f6a-85b1-e5f76b6b80a2_terseLabel_en-US" xlink:label="lab_us-gaap_InvestmentInterestRatePaidInKind" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Interest rate paid in kind</link:label>
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    <link:label id="lab_us-gaap_InvestmentsInAndAdvancesToAffiliatesLineItems_41a5a3f6-de24-41cb-9b1d-56c25d40263c_terseLabel_en-US" xlink:label="lab_us-gaap_InvestmentsInAndAdvancesToAffiliatesLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investments in and Advances to Affiliates [Line Items]</link:label>
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    <link:label id="lab_htgc_A3GTMSLLCMember_955dede1-e9fd-4c71-9aeb-8b42ad9f5dd9_terseLabel_en-US" xlink:label="lab_htgc_A3GTMSLLCMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">3GTMS, LLC</link:label>
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    <link:label id="lab_htgc_CommunicationsAndNetworkingMember_c8d4e51a-d2bf-4c07-90db-e0446a0c3fc4_terseLabel_en-US" xlink:label="lab_htgc_CommunicationsAndNetworkingMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Communications &amp; Networking</link:label>
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    <link:label id="lab_htgc_CommunicationsAndNetworkingMember_documentation_en-US" xlink:label="lab_htgc_CommunicationsAndNetworkingMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Communications and Networking.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_CommunicationsAndNetworkingMember" xlink:href="htgc-20231231.xsd#htgc_CommunicationsAndNetworkingMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_CommunicationsAndNetworkingMember" xlink:to="lab_htgc_CommunicationsAndNetworkingMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ProceedsFromIssuanceOfDebt_1b0dcaac-d1e6-4fff-a6f7-ea53fce5c562_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromIssuanceOfDebt" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Issuance of debt</link:label>
    <link:label id="lab_us-gaap_ProceedsFromIssuanceOfDebt_label_en-US" xlink:label="lab_us-gaap_ProceedsFromIssuanceOfDebt" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Proceeds from Issuance of Debt</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfDebt" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ProceedsFromIssuanceOfDebt"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProceedsFromIssuanceOfDebt" xlink:to="lab_us-gaap_ProceedsFromIssuanceOfDebt" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_DocumentTransitionReport_8f9b29c3-5fc1-4cbd-aaa8-d9526328a5f0_terseLabel_en-US" xlink:label="lab_dei_DocumentTransitionReport" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" 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/2023/dei-2023.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_us-gaap_UnsecuredDebtMember_58540475-61b1-4398-871e-dfcddb1ac501_terseLabel_en-US" xlink:label="lab_us-gaap_UnsecuredDebtMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Unsecured Debt</link:label>
    <link:label id="lab_us-gaap_UnsecuredDebtMember_label_en-US" xlink:label="lab_us-gaap_UnsecuredDebtMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Unsecured Debt [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnsecuredDebtMember" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_UnsecuredDebtMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_UnsecuredDebtMember" xlink:to="lab_us-gaap_UnsecuredDebtMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_InvestmentAffiliatedIssuerNoncontrolledMember_e40dd3f7-c749-431a-ab58-ec5a234e7059_terseLabel_en-US" xlink:label="lab_us-gaap_InvestmentAffiliatedIssuerNoncontrolledMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Affiliate investments</link:label>
    <link:label id="lab_us-gaap_InvestmentAffiliatedIssuerNoncontrolledMember_label_en-US" xlink:label="lab_us-gaap_InvestmentAffiliatedIssuerNoncontrolledMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investment, Affiliated Issuer, Noncontrolled [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentAffiliatedIssuerNoncontrolledMember" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InvestmentAffiliatedIssuerNoncontrolledMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InvestmentAffiliatedIssuerNoncontrolledMember" xlink:to="lab_us-gaap_InvestmentAffiliatedIssuerNoncontrolledMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan_380e67ae-624a-4c49-9d06-6067031c8c3e_verboseLabel_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Distributions reinvested in common stock</link:label>
    <link:label id="lab_us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan_label_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Stock Issued During Period, Value, Dividend Reinvestment Plan</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan" xlink:to="lab_us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_CommonStockParValueZeroPointZeroZeroOnePerShareMember_9ff3ad6d-9905-44f4-b1cf-7fa5364f73cc_terseLabel_en-US" xlink:label="lab_htgc_CommonStockParValueZeroPointZeroZeroOnePerShareMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Common Stock Par Value $0.001 Per Share</link:label>
    <link:label id="lab_htgc_CommonStockParValueZeroPointZeroZeroOnePerShareMember_label_en-US" xlink:label="lab_htgc_CommonStockParValueZeroPointZeroZeroOnePerShareMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Common Stock Par Value Zero Point Zero Zero One Per Share [Member]</link:label>
    <link:label id="lab_htgc_CommonStockParValueZeroPointZeroZeroOnePerShareMember_documentation_en-US" xlink:label="lab_htgc_CommonStockParValueZeroPointZeroZeroOnePerShareMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Common stock par value zero point zero zero one per share.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_CommonStockParValueZeroPointZeroZeroOnePerShareMember" xlink:href="htgc-20231231.xsd#htgc_CommonStockParValueZeroPointZeroZeroOnePerShareMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_CommonStockParValueZeroPointZeroZeroOnePerShareMember" xlink:to="lab_htgc_CommonStockParValueZeroPointZeroZeroOnePerShareMember" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_NetChangeInUnrealizedAppreciationDepreciationAbstract_1eccaa77-4cc8-4197-a199-4b7ab83bb41e_terseLabel_en-US" xlink:label="lab_htgc_NetChangeInUnrealizedAppreciationDepreciationAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Net change in unrealized appreciation (depreciation):</link:label>
    <link:label id="lab_htgc_NetChangeInUnrealizedAppreciationDepreciationAbstract_label_en-US" xlink:label="lab_htgc_NetChangeInUnrealizedAppreciationDepreciationAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Net Change In Unrealized Appreciation Depreciation [Abstract]</link:label>
    <link:label id="lab_htgc_NetChangeInUnrealizedAppreciationDepreciationAbstract_documentation_en-US" xlink:label="lab_htgc_NetChangeInUnrealizedAppreciationDepreciationAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Net change in unrealized appreciation (depreciation).</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_NetChangeInUnrealizedAppreciationDepreciationAbstract" xlink:href="htgc-20231231.xsd#htgc_NetChangeInUnrealizedAppreciationDepreciationAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_NetChangeInUnrealizedAppreciationDepreciationAbstract" xlink:to="lab_htgc_NetChangeInUnrealizedAppreciationDepreciationAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_WeMayInTheFutureDetermineToIssuePreferredStockWhichCouldAdverselyAffectTheMarketValueOfOurCommonStockMember_label_en-US" xlink:label="lab_htgc_WeMayInTheFutureDetermineToIssuePreferredStockWhichCouldAdverselyAffectTheMarketValueOfOurCommonStockMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">We may in the future determine to issue preferred stock, which could adversely affect the market value of our common stock [Member]</link:label>
    <link:label id="lab_htgc_WeMayInTheFutureDetermineToIssuePreferredStockWhichCouldAdverselyAffectTheMarketValueOfOurCommonStockMember_documentation_en-US" xlink:label="lab_htgc_WeMayInTheFutureDetermineToIssuePreferredStockWhichCouldAdverselyAffectTheMarketValueOfOurCommonStockMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">We may in the future determine to issue preferred stock, which could adversely affect the market value of our common stock [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_WeMayInTheFutureDetermineToIssuePreferredStockWhichCouldAdverselyAffectTheMarketValueOfOurCommonStockMember" xlink:href="htgc-20231231.xsd#htgc_WeMayInTheFutureDetermineToIssuePreferredStockWhichCouldAdverselyAffectTheMarketValueOfOurCommonStockMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_WeMayInTheFutureDetermineToIssuePreferredStockWhichCouldAdverselyAffectTheMarketValueOfOurCommonStockMember" xlink:to="lab_htgc_WeMayInTheFutureDetermineToIssuePreferredStockWhichCouldAdverselyAffectTheMarketValueOfOurCommonStockMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityPublicFloat_9a1eedfa-e823-40f3-953a-3000cd27f066_terseLabel_en-US" xlink:label="lab_dei_EntityPublicFloat" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Public Float</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityPublicFloat" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityPublicFloat"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityPublicFloat" xlink:to="lab_dei_EntityPublicFloat" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_InvestmentIncomeTextBlock_89b42d23-016f-4894-90bc-0017b9f09add_terseLabel_en-US" xlink:label="lab_us-gaap_InvestmentIncomeTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Investment Interest Income and Fee Income</link:label>
    <link:label id="lab_us-gaap_InvestmentIncomeTextBlock_label_en-US" xlink:label="lab_us-gaap_InvestmentIncomeTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investment Income [Table Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIncomeTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InvestmentIncomeTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InvestmentIncomeTextBlock" xlink:to="lab_us-gaap_InvestmentIncomeTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_99759fa7-e44b-446a-8f82-633c3c62a797_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]</link:label>
    <link:label id="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_label_en-US" xlink:label="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" xlink:to="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_ThumbtackIncMember_24be4871-a0af-4c83-832b-c2ada614cc36_terseLabel_en-US" xlink:label="lab_htgc_ThumbtackIncMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Thumbtack, Inc.</link:label>
    <link:label id="lab_htgc_ThumbtackIncMember_label_en-US" xlink:label="lab_htgc_ThumbtackIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Thumbtack, Inc. [Member]</link:label>
    <link:label id="lab_htgc_ThumbtackIncMember_documentation_en-US" xlink:label="lab_htgc_ThumbtackIncMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Thumbtack, Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_ThumbtackIncMember" xlink:href="htgc-20231231.xsd#htgc_ThumbtackIncMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_ThumbtackIncMember" xlink:to="lab_htgc_ThumbtackIncMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DerivativeInstrumentRiskAxis_174a80ac-2918-45fa-8c01-c5efc66a190c_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeInstrumentRiskAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Derivative Instrument [Axis]</link:label>
    <link:label id="lab_us-gaap_DerivativeInstrumentRiskAxis_label_en-US" xlink:label="lab_us-gaap_DerivativeInstrumentRiskAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Derivative Instrument [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis" xlink:to="lab_us-gaap_DerivativeInstrumentRiskAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_UnfundedCommitmentsDueInNinthYear_6071c271-e527-464e-98ec-82f1d3af61fd_terseLabel_en-US" xlink:label="lab_htgc_UnfundedCommitmentsDueInNinthYear" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">2032</link:label>
    <link:label id="lab_htgc_UnfundedCommitmentsDueInNinthYear_label_en-US" xlink:label="lab_htgc_UnfundedCommitmentsDueInNinthYear" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Unfunded Commitments Due In Ninth Year</link:label>
    <link:label id="lab_htgc_UnfundedCommitmentsDueInNinthYear_documentation_en-US" xlink:label="lab_htgc_UnfundedCommitmentsDueInNinthYear" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Unfunded Commitments Due In Ninth Year</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_UnfundedCommitmentsDueInNinthYear" xlink:href="htgc-20231231.xsd#htgc_UnfundedCommitmentsDueInNinthYear"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_UnfundedCommitmentsDueInNinthYear" xlink:to="lab_htgc_UnfundedCommitmentsDueInNinthYear" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DebtInstrumentCarryingAmount_82f58fff-30af-4560-ae4c-e615b1e55ea4_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentCarryingAmount" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Principal</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentCarryingAmount_3050256c-592b-4345-a791-5f7bb76295e1_verboseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentCarryingAmount" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Outstanding Principal Balances</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentCarryingAmount_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentCarryingAmount" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Long-Term Debt, Gross</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentCarryingAmount" xlink:to="lab_us-gaap_DebtInstrumentCarryingAmount" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_InvestmentCompanyRealizedAndUnrealizedGainLossOnInvestmentAndForeignCurrencyAbstract_6c09a558-860a-4f45-9d24-d501fa5e5444_terseLabel_en-US" xlink:label="lab_us-gaap_InvestmentCompanyRealizedAndUnrealizedGainLossOnInvestmentAndForeignCurrencyAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Net realized gain (loss) and net change in unrealized appreciation (depreciation):</link:label>
    <link:label id="lab_us-gaap_InvestmentCompanyRealizedAndUnrealizedGainLossOnInvestmentAndForeignCurrencyAbstract_label_en-US" xlink:label="lab_us-gaap_InvestmentCompanyRealizedAndUnrealizedGainLossOnInvestmentAndForeignCurrencyAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Gain (Loss), Investment and Derivative, Operating, and Foreign Currency Transaction, before Tax [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentCompanyRealizedAndUnrealizedGainLossOnInvestmentAndForeignCurrencyAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InvestmentCompanyRealizedAndUnrealizedGainLossOnInvestmentAndForeignCurrencyAbstract"/>
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    <link:label id="lab_htgc_ThreatConnectIncMember_001f136f-ea41-456d-92c6-182ac63e90ac_terseLabel_en-US" xlink:label="lab_htgc_ThreatConnectIncMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">ThreatConnect, Inc.</link:label>
    <link:label id="lab_htgc_ThreatConnectIncMember_label_en-US" xlink:label="lab_htgc_ThreatConnectIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Threat Connect Inc [Member]</link:label>
    <link:label id="lab_htgc_ThreatConnectIncMember_documentation_en-US" xlink:label="lab_htgc_ThreatConnectIncMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">ThreatConnect, Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_ThreatConnectIncMember" xlink:href="htgc-20231231.xsd#htgc_ThreatConnectIncMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_ThreatConnectIncMember" xlink:to="lab_htgc_ThreatConnectIncMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_9ea84759-a207-451e-95e2-19825fae5875_terseLabel_en-US" xlink:label="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Debt Less than 1 year</link:label>
    <link:label id="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_label_en-US" xlink:label="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Long-Term Debt, Maturity, Year One</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths" xlink:to="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_InvestmentCompanyInvestmentIncomeLossPerShare_35aec261-2219-4402-b5ea-25d3a3323047_terseLabel_en-US" xlink:label="lab_us-gaap_InvestmentCompanyInvestmentIncomeLossPerShare" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Basic (in dollars per share)</link:label>
    <link:label id="lab_us-gaap_InvestmentCompanyInvestmentIncomeLossPerShare_label_en-US" xlink:label="lab_us-gaap_InvestmentCompanyInvestmentIncomeLossPerShare" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investment Company, Investment Income (Loss), Per Share</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentCompanyInvestmentIncomeLossPerShare" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InvestmentCompanyInvestmentIncomeLossPerShare"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InvestmentCompanyInvestmentIncomeLossPerShare" xlink:to="lab_us-gaap_InvestmentCompanyInvestmentIncomeLossPerShare" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_SharePrice_0bd10a43-12ba-4b1e-8b5e-ab940438bde3_terseLabel_en-US" xlink:label="lab_us-gaap_SharePrice" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Per share market value at end of period (in dollars per share)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharePrice" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharePrice"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SharePrice" xlink:to="lab_us-gaap_SharePrice" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_OtherAssets_6b4c57f6-7ae4-42ee-8ad8-4f59de0aeea5_terseLabel_en-US" xlink:label="lab_us-gaap_OtherAssets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other assets</link:label>
    <link:label id="lab_us-gaap_OtherAssets_label_en-US" xlink:label="lab_us-gaap_OtherAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other Assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssets" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherAssets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherAssets" xlink:to="lab_us-gaap_OtherAssets" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_PathAIIncMember_d18eab6f-036e-47ff-a1de-5c316699a290_terseLabel_en-US" xlink:label="lab_htgc_PathAIIncMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">PathAI, Inc.</link:label>
    <link:label id="lab_htgc_PathAIIncMember_label_en-US" xlink:label="lab_htgc_PathAIIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">PathAI, Inc. [Member]</link:label>
    <link:label id="lab_htgc_PathAIIncMember_documentation_en-US" xlink:label="lab_htgc_PathAIIncMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">PathAI, Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_PathAIIncMember" xlink:href="htgc-20231231.xsd#htgc_PathAIIncMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_PathAIIncMember" xlink:to="lab_htgc_PathAIIncMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_21e367ec-687c-499d-b643-415d7fa0f297_terseLabel_en-US" xlink:label="lab_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Common shares issuable (in shares)</link:label>
    <link:label id="lab_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_label_en-US" xlink:label="lab_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements" xlink:to="lab_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_DemandbaseIncMember_81d7ece9-1de4-47cc-9e24-f81d6c332d7d_terseLabel_en-US" xlink:label="lab_htgc_DemandbaseIncMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Demandbase, Inc.</link:label>
    <link:label id="lab_htgc_DemandbaseIncMember_label_en-US" xlink:label="lab_htgc_DemandbaseIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Demandbase, Inc. [Member]</link:label>
    <link:label id="lab_htgc_DemandbaseIncMember_documentation_en-US" xlink:label="lab_htgc_DemandbaseIncMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Demandbase, Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_DemandbaseIncMember" xlink:href="htgc-20231231.xsd#htgc_DemandbaseIncMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_DemandbaseIncMember" xlink:to="lab_htgc_DemandbaseIncMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ContractualObligationDueAfterFifthYear_7e560524-1978-4997-8dc6-ba46d9093ca0_terseLabel_en-US" xlink:label="lab_us-gaap_ContractualObligationDueAfterFifthYear" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Contractual Obligations, After 5 years</link:label>
    <link:label id="lab_us-gaap_ContractualObligationDueAfterFifthYear_label_en-US" xlink:label="lab_us-gaap_ContractualObligationDueAfterFifthYear" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Contractual Obligation, to be Paid, after Year Five</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractualObligationDueAfterFifthYear" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ContractualObligationDueAfterFifthYear"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ContractualObligationDueAfterFifthYear" xlink:to="lab_us-gaap_ContractualObligationDueAfterFifthYear" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_DocumentsIncorporatedByReferenceTextBlock_38d3d9ea-25d3-4017-8f2b-4daf49923ae2_terseLabel_en-US" xlink:label="lab_dei_DocumentsIncorporatedByReferenceTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Documents Incorporated By Reference</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentsIncorporatedByReferenceTextBlock" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_DocumentsIncorporatedByReferenceTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_DocumentsIncorporatedByReferenceTextBlock" xlink:to="lab_dei_DocumentsIncorporatedByReferenceTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_EscrowReceivablesPolicyPolicyPolicyTextBlock_a185139e-92be-459f-9bbd-92531faf57ec_terseLabel_en-US" xlink:label="lab_htgc_EscrowReceivablesPolicyPolicyPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Escrow Receivables</link:label>
    <link:label id="lab_htgc_EscrowReceivablesPolicyPolicyPolicyTextBlock_label_en-US" xlink:label="lab_htgc_EscrowReceivablesPolicyPolicyPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Escrow Receivables Policy Policy [Policy Text Block]</link:label>
    <link:label id="lab_htgc_EscrowReceivablesPolicyPolicyPolicyTextBlock_documentation_en-US" xlink:label="lab_htgc_EscrowReceivablesPolicyPolicyPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Escrow receivables policy.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_EscrowReceivablesPolicyPolicyPolicyTextBlock" xlink:href="htgc-20231231.xsd#htgc_EscrowReceivablesPolicyPolicyPolicyTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_EscrowReceivablesPolicyPolicyPolicyTextBlock" xlink:to="lab_htgc_EscrowReceivablesPolicyPolicyPolicyTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_DocumentPeriodEndDate_e40a7edf-a9ba-4504-85b2-ec611be34fda_terseLabel_en-US" xlink:label="lab_dei_DocumentPeriodEndDate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" 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/2023/dei-2023.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_htgc_UnfundedCommitmentsDueInSecondYear_5520cab9-a3fa-4a39-a293-eb091805caac_terseLabel_en-US" xlink:label="lab_htgc_UnfundedCommitmentsDueInSecondYear" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">2025</link:label>
    <link:label id="lab_htgc_UnfundedCommitmentsDueInSecondYear_label_en-US" xlink:label="lab_htgc_UnfundedCommitmentsDueInSecondYear" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Unfunded Commitments Due In Second Year</link:label>
    <link:label id="lab_htgc_UnfundedCommitmentsDueInSecondYear_documentation_en-US" xlink:label="lab_htgc_UnfundedCommitmentsDueInSecondYear" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Unfunded commitments due in second year.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_UnfundedCommitmentsDueInSecondYear" xlink:href="htgc-20231231.xsd#htgc_UnfundedCommitmentsDueInSecondYear"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_UnfundedCommitmentsDueInSecondYear" xlink:to="lab_htgc_UnfundedCommitmentsDueInSecondYear" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_OurFinancialResultsCouldBeNegativelyAffectedIfASignificantPortfolioInvestmentFailsToPerformAsExpectedMember_label_en-US" xlink:label="lab_htgc_OurFinancialResultsCouldBeNegativelyAffectedIfASignificantPortfolioInvestmentFailsToPerformAsExpectedMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Our financial results could be negatively affected if a significant portfolio investment fails to perform as expected [Member]</link:label>
    <link:label id="lab_htgc_OurFinancialResultsCouldBeNegativelyAffectedIfASignificantPortfolioInvestmentFailsToPerformAsExpectedMember_documentation_en-US" xlink:label="lab_htgc_OurFinancialResultsCouldBeNegativelyAffectedIfASignificantPortfolioInvestmentFailsToPerformAsExpectedMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Our financial results could be negatively affected if a significant portfolio investment fails to perform as expected [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_OurFinancialResultsCouldBeNegativelyAffectedIfASignificantPortfolioInvestmentFailsToPerformAsExpectedMember" xlink:href="htgc-20231231.xsd#htgc_OurFinancialResultsCouldBeNegativelyAffectedIfASignificantPortfolioInvestmentFailsToPerformAsExpectedMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_OurFinancialResultsCouldBeNegativelyAffectedIfASignificantPortfolioInvestmentFailsToPerformAsExpectedMember" xlink:to="lab_htgc_OurFinancialResultsCouldBeNegativelyAffectedIfASignificantPortfolioInvestmentFailsToPerformAsExpectedMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent_f817148b-2f20-46dd-ae10-c4aa76ac5fce_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accounts payable and accrued liabilities</link:label>
    <link:label id="lab_us-gaap_DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent_label_en-US" xlink:label="lab_us-gaap_DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Deferred Compensation Share-Based Arrangements, Liability, Current and Noncurrent</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent" xlink:to="lab_us-gaap_DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_GibraltarBusinessCapitalLLCMember_3b80fc0a-51a1-4599-9ae9-d6dcc855b31d_terseLabel_en-US" xlink:label="lab_htgc_GibraltarBusinessCapitalLLCMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Gibraltar Business Capital, LLC</link:label>
    <link:label id="lab_htgc_GibraltarBusinessCapitalLLCMember_label_en-US" xlink:label="lab_htgc_GibraltarBusinessCapitalLLCMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Gibraltar Business Capital L L C [Member]</link:label>
    <link:label id="lab_htgc_GibraltarBusinessCapitalLLCMember_documentation_en-US" xlink:label="lab_htgc_GibraltarBusinessCapitalLLCMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Gibraltar Business Capital, LLC.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_GibraltarBusinessCapitalLLCMember" xlink:href="htgc-20231231.xsd#htgc_GibraltarBusinessCapitalLLCMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_GibraltarBusinessCapitalLLCMember" xlink:to="lab_htgc_GibraltarBusinessCapitalLLCMember" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_ElationHealthIncMember_95d2ab0f-36c1-4b91-9166-fd668de12e1b_terseLabel_en-US" xlink:label="lab_htgc_ElationHealthIncMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Elation Health, Inc.</link:label>
    <link:label id="lab_htgc_ElationHealthIncMember_label_en-US" xlink:label="lab_htgc_ElationHealthIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Elation Health Inc [Member]</link:label>
    <link:label id="lab_htgc_ElationHealthIncMember_documentation_en-US" xlink:label="lab_htgc_ElationHealthIncMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Elation Health Inc [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_ElationHealthIncMember" xlink:href="htgc-20231231.xsd#htgc_ElationHealthIncMember"/>
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    <link:label id="lab_country_US_a50ee4a1-a566-4534-9ab0-246abda9ff20_terseLabel_en-US" xlink:label="lab_country_US" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">United States</link:label>
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    <link:label id="lab_us-gaap_FairValueMeasurementsRecurringMember_69945fb9-a255-4f9d-879f-ce5de311bfc2_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueMeasurementsRecurringMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Recurring</link:label>
    <link:label id="lab_us-gaap_FairValueMeasurementsRecurringMember_label_en-US" xlink:label="lab_us-gaap_FairValueMeasurementsRecurringMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Fair Value, Recurring [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueMeasurementsRecurringMember"/>
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    <link:label id="lab_us-gaap_PaymentsOfDividends_label_en-US" xlink:label="lab_us-gaap_PaymentsOfDividends" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Payments of Dividends</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDividends" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PaymentsOfDividends"/>
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    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_f8d91c9e-75fa-491d-92c1-7b6b1103cf86_totalLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total lease payments</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue"/>
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    <link:label id="lab_htgc_RealizedGainLossMember_9ce2a2db-5c73-4fd4-9485-75f578b66f91_terseLabel_en-US" xlink:label="lab_htgc_RealizedGainLossMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Realized Gain Loss</link:label>
    <link:label id="lab_htgc_RealizedGainLossMember_d2522fde-a12d-4607-8382-4fe4b9c6e066_verboseLabel_en-US" xlink:label="lab_htgc_RealizedGainLossMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Net realized gain (loss)</link:label>
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    <link:label id="lab_htgc_RealizedGainLossMember_documentation_en-US" xlink:label="lab_htgc_RealizedGainLossMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Realized gain loss.</link:label>
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    <link:label id="lab_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases_5c77b0d7-a80e-433e-8e35-6792f9882c9f_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Purchases</link:label>
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    <link:label id="lab_htgc_SignalMediaLimitedMember_label_en-US" xlink:label="lab_htgc_SignalMediaLimitedMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Signal Media Limited [Member]</link:label>
    <link:label id="lab_htgc_SignalMediaLimitedMember_documentation_en-US" xlink:label="lab_htgc_SignalMediaLimitedMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Signal Media Limited.</link:label>
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    <link:label id="lab_us-gaap_OperatingExpenses_95f6529c-c91a-44c1-946f-44cea7e70032_totalLabel_en-US" xlink:label="lab_us-gaap_OperatingExpenses" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total gross operating expenses</link:label>
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    <link:label id="lab_us-gaap_InvestmentCompanyExpenseRatioIncludingIncentiveFee_3303552b-faf1-4bc3-98e4-b58d9cf2673c_terseLabel_en-US" xlink:label="lab_us-gaap_InvestmentCompanyExpenseRatioIncludingIncentiveFee" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Ratio of total expense to average net assets</link:label>
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    <link:label id="lab_htgc_OakStreetHealthIncMember_92c471e4-aa68-4c93-b858-c5aa68cfe5c1_terseLabel_en-US" xlink:label="lab_htgc_OakStreetHealthIncMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Oak Street Health, Inc.</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_SmallBusinessAdministrationDebenturesHtIiiMember" xlink:to="lab_htgc_SmallBusinessAdministrationDebenturesHtIiiMember" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_July2024NotesMember_label_en-US" xlink:label="lab_htgc_July2024NotesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">July 2024 Notes [Member]</link:label>
    <link:label id="lab_htgc_July2024NotesMember_documentation_en-US" xlink:label="lab_htgc_July2024NotesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">July 2024 Notes [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_July2024NotesMember" xlink:href="htgc-20231231.xsd#htgc_July2024NotesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_July2024NotesMember" xlink:to="lab_htgc_July2024NotesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LesseeLeasesPolicyTextBlock_5ad54ffd-97d1-4a27-834c-9e00f813293b_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeLeasesPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Leases</link:label>
    <link:label id="lab_us-gaap_LesseeLeasesPolicyTextBlock_label_en-US" xlink:label="lab_us-gaap_LesseeLeasesPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Lessee, Leases [Policy Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeasesPolicyTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LesseeLeasesPolicyTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeLeasesPolicyTextBlock" xlink:to="lab_us-gaap_LesseeLeasesPolicyTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_RelatedPartyTransactionSalesToRelatedParty_21fcbf52-f4f4-44fd-ab36-bddc3be45aac_terseLabel_en-US" xlink:label="lab_htgc_RelatedPartyTransactionSalesToRelatedParty" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Sales to related party</link:label>
    <link:label id="lab_htgc_RelatedPartyTransactionSalesToRelatedParty_label_en-US" xlink:label="lab_htgc_RelatedPartyTransactionSalesToRelatedParty" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Related Party Transaction, Sales to Related Party</link:label>
    <link:label id="lab_htgc_RelatedPartyTransactionSalesToRelatedParty_documentation_en-US" xlink:label="lab_htgc_RelatedPartyTransactionSalesToRelatedParty" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Related Party Transaction, Sales to Related Party</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_RelatedPartyTransactionSalesToRelatedParty" xlink:href="htgc-20231231.xsd#htgc_RelatedPartyTransactionSalesToRelatedParty"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_RelatedPartyTransactionSalesToRelatedParty" xlink:to="lab_htgc_RelatedPartyTransactionSalesToRelatedParty" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_LowerMiddleMarketMember_5f69ee00-374e-4caa-be77-f5e357b29e78_terseLabel_en-US" xlink:label="lab_htgc_LowerMiddleMarketMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Lower Middle Market</link:label>
    <link:label id="lab_htgc_LowerMiddleMarketMember_label_en-US" xlink:label="lab_htgc_LowerMiddleMarketMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Lower Middle Market [Member]</link:label>
    <link:label id="lab_htgc_LowerMiddleMarketMember_documentation_en-US" xlink:label="lab_htgc_LowerMiddleMarketMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Lower middle market.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_LowerMiddleMarketMember" xlink:href="htgc-20231231.xsd#htgc_LowerMiddleMarketMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_LowerMiddleMarketMember" xlink:to="lab_htgc_LowerMiddleMarketMember" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_CommonStockInvestmentMember_51b53c9f-c831-4fc9-9f8f-937fc54e4f87_terseLabel_en-US" xlink:label="lab_htgc_CommonStockInvestmentMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Common Stock Investment</link:label>
    <link:label id="lab_htgc_CommonStockInvestmentMember_label_en-US" xlink:label="lab_htgc_CommonStockInvestmentMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Common Stock Investment [Member]</link:label>
    <link:label id="lab_htgc_CommonStockInvestmentMember_documentation_en-US" xlink:label="lab_htgc_CommonStockInvestmentMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Common Stock Investment Member</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_CommonStockInvestmentMember" xlink:href="htgc-20231231.xsd#htgc_CommonStockInvestmentMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_CommonStockInvestmentMember" xlink:to="lab_htgc_CommonStockInvestmentMember" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_SecuredCreditFacilityWithMUFGBankLtdMUFGMember_label_en-US" xlink:label="lab_htgc_SecuredCreditFacilityWithMUFGBankLtdMUFGMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Secured Credit Facility with M U F G Bank Ltd. (M U F G) [Member]</link:label>
    <link:label id="lab_htgc_SecuredCreditFacilityWithMUFGBankLtdMUFGMember_documentation_en-US" xlink:label="lab_htgc_SecuredCreditFacilityWithMUFGBankLtdMUFGMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Secured Credit Facility with M U F G Bank Ltd. (M U F G) [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_SecuredCreditFacilityWithMUFGBankLtdMUFGMember" xlink:href="htgc-20231231.xsd#htgc_SecuredCreditFacilityWithMUFGBankLtdMUFGMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_SecuredCreditFacilityWithMUFGBankLtdMUFGMember" xlink:to="lab_htgc_SecuredCreditFacilityWithMUFGBankLtdMUFGMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_626d5248-a7f8-423d-aadb-ae4c3732a092_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted Average Grant Date Fair Value per Share</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_OtherMember_7f4403ae-6f37-4d1c-b8a9-b8f41ec9a5dd_terseLabel_en-US" xlink:label="lab_htgc_OtherMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other</link:label>
    <link:label id="lab_htgc_OtherMember_label_en-US" xlink:label="lab_htgc_OtherMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other [Member]</link:label>
    <link:label id="lab_htgc_OtherMember_documentation_en-US" xlink:label="lab_htgc_OtherMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_OtherMember" xlink:href="htgc-20231231.xsd#htgc_OtherMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_OtherMember" xlink:to="lab_htgc_OtherMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_71f1255b-9c8d-48bb-87e4-8b8b8782aeb4_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table]</link:label>
    <link:label id="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_label_en-US" xlink:label="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Fair Value, Recurring and Nonrecurring [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" xlink:to="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardTermsOfAward_830d15be-75f4-43b4-94c5-1d77c6bbf862_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardTermsOfAward" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Service vesting awards</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardTermsOfAward_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardTermsOfAward" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share-Based Compensation Arrangement by Share-Based Payment Award, Terms of Award</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardTermsOfAward" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardTermsOfAward"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardTermsOfAward" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardTermsOfAward" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DerivativeFairValueOfDerivativeLiability_a4fe1e76-fbfb-4025-9ae4-bf37c9b5273e_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeFairValueOfDerivativeLiability" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total</link:label>
    <link:label id="lab_us-gaap_DerivativeFairValueOfDerivativeLiability_label_en-US" xlink:label="lab_us-gaap_DerivativeFairValueOfDerivativeLiability" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Derivative Liability, Subject to Master Netting Arrangement, before Offset</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiability" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeFairValueOfDerivativeLiability"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeFairValueOfDerivativeLiability" xlink:to="lab_us-gaap_DerivativeFairValueOfDerivativeLiability" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_ExitFeeMember_d85511ce-e30a-4697-98c1-db7d992e1238_terseLabel_en-US" xlink:label="lab_htgc_ExitFeeMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Exit fee interest income</link:label>
    <link:label id="lab_htgc_ExitFeeMember_label_en-US" xlink:label="lab_htgc_ExitFeeMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Exit Fee [Member]</link:label>
    <link:label id="lab_htgc_ExitFeeMember_documentation_en-US" xlink:label="lab_htgc_ExitFeeMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Exit Fee.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_ExitFeeMember" xlink:href="htgc-20231231.xsd#htgc_ExitFeeMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_ExitFeeMember" xlink:to="lab_htgc_ExitFeeMember" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_TotalInvestmentsBenchmarkGeographicalMember_2462b341-5d07-417a-b501-700a5f7d5af3_terseLabel_en-US" xlink:label="lab_htgc_TotalInvestmentsBenchmarkGeographicalMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total Investments Benchmark, Geographical</link:label>
    <link:label id="lab_htgc_TotalInvestmentsBenchmarkGeographicalMember_label_en-US" xlink:label="lab_htgc_TotalInvestmentsBenchmarkGeographicalMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total Investments Benchmark, Geographical [Member]</link:label>
    <link:label id="lab_htgc_TotalInvestmentsBenchmarkGeographicalMember_documentation_en-US" xlink:label="lab_htgc_TotalInvestmentsBenchmarkGeographicalMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total Investments Benchmark, Geographical</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_TotalInvestmentsBenchmarkGeographicalMember" xlink:href="htgc-20231231.xsd#htgc_TotalInvestmentsBenchmarkGeographicalMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_TotalInvestmentsBenchmarkGeographicalMember" xlink:to="lab_htgc_TotalInvestmentsBenchmarkGeographicalMember" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_AdviserSubsidiaryInvestmentCommitments_60d5f08a-e461-4446-b535-aaf767dd8268_terseLabel_en-US" xlink:label="lab_htgc_AdviserSubsidiaryInvestmentCommitments" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Adviser Subsidiary investment commitments</link:label>
    <link:label id="lab_htgc_AdviserSubsidiaryInvestmentCommitments_label_en-US" xlink:label="lab_htgc_AdviserSubsidiaryInvestmentCommitments" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Adviser Subsidiary Investment Commitments</link:label>
    <link:label id="lab_htgc_AdviserSubsidiaryInvestmentCommitments_documentation_en-US" xlink:label="lab_htgc_AdviserSubsidiaryInvestmentCommitments" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Adviser subsidiary investment commitments.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_AdviserSubsidiaryInvestmentCommitments" xlink:href="htgc-20231231.xsd#htgc_AdviserSubsidiaryInvestmentCommitments"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_AdviserSubsidiaryInvestmentCommitments" xlink:to="lab_htgc_AdviserSubsidiaryInvestmentCommitments" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_SeniorSecuredDebtOneMember_480c3186-1007-48a5-9f46-dc922b08b270_terseLabel_en-US" xlink:label="lab_htgc_SeniorSecuredDebtOneMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Senior Secured Debt One</link:label>
    <link:label id="lab_htgc_SeniorSecuredDebtOneMember_label_en-US" xlink:label="lab_htgc_SeniorSecuredDebtOneMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Senior Secured Debt One [Member]</link:label>
    <link:label id="lab_htgc_SeniorSecuredDebtOneMember_documentation_en-US" xlink:label="lab_htgc_SeniorSecuredDebtOneMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Senior Secured Debt One [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_SeniorSecuredDebtOneMember" xlink:href="htgc-20231231.xsd#htgc_SeniorSecuredDebtOneMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_SeniorSecuredDebtOneMember" xlink:to="lab_htgc_SeniorSecuredDebtOneMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_FairValueInputsLevel3Member_0c8bddd6-2db4-4c31-b5b0-201cf8278c3e_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueInputsLevel3Member" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Significant Unobservable Inputs (Level 3)</link:label>
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    <link:label id="lab_htgc_PhathomPharmaceuticalsIncMember_67536ba3-cea2-4647-bbe7-c116dcde634b_terseLabel_en-US" xlink:label="lab_htgc_PhathomPharmaceuticalsIncMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Phathom Pharmaceuticals, Inc.</link:label>
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    <link:label id="lab_us-gaap_InvestmentCompanyDistributionOrdinaryIncome_202bedbf-d1d2-4048-9270-c59810137ce6_terseLabel_en-US" xlink:label="lab_us-gaap_InvestmentCompanyDistributionOrdinaryIncome" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Ordinary income</link:label>
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    <link:label id="lab_htgc_CytracomHoldingsLLCMember_04a18152-2ff0-4cfd-ac9d-b9fef8fcebd1_terseLabel_en-US" xlink:label="lab_htgc_CytracomHoldingsLLCMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cytracom Holdings LLC</link:label>
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    <link:label id="lab_htgc_AnnexCloudMember_991d7cd0-4849-4554-bffd-58488265206f_terseLabel_en-US" xlink:label="lab_htgc_AnnexCloudMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Annex Cloud</link:label>
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    <link:label id="lab_htgc_March2026BNotesMember_documentation_en-US" xlink:label="lab_htgc_March2026BNotesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">March 2026 B Notes [Member]</link:label>
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    <link:label id="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalOther_60c0af44-57f3-445f-98f9-1efc5128370b_verboseLabel_en-US" xlink:label="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalOther" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Reclassified accumulated net realized gains (losses)</link:label>
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    <link:label id="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalOther_label_en-US" xlink:label="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalOther" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Adjustments to Additional Paid in Capital, Other</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalOther" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalOther"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalOther" xlink:to="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalOther" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_OpenForwardForeignCurrencyContractIdentifierAxis_16a3832c-9f1d-4db9-8141-819d993c6620_terseLabel_en-US" xlink:label="lab_us-gaap_OpenForwardForeignCurrencyContractIdentifierAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Open Forward Foreign Currency Contract, Identifier [Axis]</link:label>
    <link:label id="lab_us-gaap_OpenForwardForeignCurrencyContractIdentifierAxis_label_en-US" xlink:label="lab_us-gaap_OpenForwardForeignCurrencyContractIdentifierAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Open Forward Foreign Currency Contract, Identifier [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OpenForwardForeignCurrencyContractIdentifierAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OpenForwardForeignCurrencyContractIdentifierAxis"/>
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    <link:label id="lab_us-gaap_FairValueRecurringBasisUnobservableInputReconciliationAssetGainLossStatementOfIncomeExtensibleList_2eda0d03-c7f6-40e4-b5dd-ab9704482f47_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueRecurringBasisUnobservableInputReconciliationAssetGainLossStatementOfIncomeExtensibleList" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]</link:label>
    <link:label id="lab_us-gaap_FairValueRecurringBasisUnobservableInputReconciliationAssetGainLossStatementOfIncomeExtensibleList_label_en-US" xlink:label="lab_us-gaap_FairValueRecurringBasisUnobservableInputReconciliationAssetGainLossStatementOfIncomeExtensibleList" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueRecurringBasisUnobservableInputReconciliationAssetGainLossStatementOfIncomeExtensibleList" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueRecurringBasisUnobservableInputReconciliationAssetGainLossStatementOfIncomeExtensibleList"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueRecurringBasisUnobservableInputReconciliationAssetGainLossStatementOfIncomeExtensibleList" xlink:to="lab_us-gaap_FairValueRecurringBasisUnobservableInputReconciliationAssetGainLossStatementOfIncomeExtensibleList" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_ConvertibleNotes2016Member_label_en-US" xlink:label="lab_htgc_ConvertibleNotes2016Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Convertible Notes 2016 [Member]</link:label>
    <link:label id="lab_htgc_ConvertibleNotes2016Member_documentation_en-US" xlink:label="lab_htgc_ConvertibleNotes2016Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Convertible Notes 2016 [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_ConvertibleNotes2016Member" xlink:href="htgc-20231231.xsd#htgc_ConvertibleNotes2016Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_ConvertibleNotes2016Member" xlink:to="lab_htgc_ConvertibleNotes2016Member" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LongtermDebtTypeDomain_9f8529db-7e67-4c41-975b-591b6d3135e0_terseLabel_en-US" xlink:label="lab_us-gaap_LongtermDebtTypeDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Long-Term Debt, Type</link:label>
    <link:label id="lab_us-gaap_LongtermDebtTypeDomain_label_en-US" xlink:label="lab_us-gaap_LongtermDebtTypeDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Long-Term Debt, Type [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LongtermDebtTypeDomain" xlink:to="lab_us-gaap_LongtermDebtTypeDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityFileNumber_8f140d2c-53b2-4c2a-b18f-6bad55fad59a_terseLabel_en-US" xlink:label="lab_dei_EntityFileNumber" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" 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/2023/dei-2023.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_us-gaap_LossContingenciesTable_23465e6a-1c5d-4f95-974f-f9d55b853d62_terseLabel_en-US" xlink:label="lab_us-gaap_LossContingenciesTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Loss Contingencies [Table]</link:label>
    <link:label id="lab_us-gaap_LossContingenciesTable_label_en-US" xlink:label="lab_us-gaap_LossContingenciesTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Loss Contingencies [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesTable" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LossContingenciesTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LossContingenciesTable" xlink:to="lab_us-gaap_LossContingenciesTable" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_ee0006dc-f570-4dfb-b696-7849b56d79f0_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Lease and License Obligations After 5 years</link:label>
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Lessee, Operating Lease, Liability, to be Paid, after Year Five</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive"/>
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    <link:label id="lab_us-gaap_MeasurementInputDiscountRateMember_37b4e291-db55-4c86-b831-bee37a77910f_terseLabel_en-US" xlink:label="lab_us-gaap_MeasurementInputDiscountRateMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Discount Rate</link:label>
    <link:label id="lab_us-gaap_MeasurementInputDiscountRateMember_label_en-US" xlink:label="lab_us-gaap_MeasurementInputDiscountRateMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Measurement Input, Discount Rate [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputDiscountRateMember" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_MeasurementInputDiscountRateMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_MeasurementInputDiscountRateMember" xlink:to="lab_us-gaap_MeasurementInputDiscountRateMember" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_DividendDeclaredThreeMember_25ac7cdc-6113-488d-816e-8101ce712888_terseLabel_en-US" xlink:label="lab_htgc_DividendDeclaredThreeMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Dividend Declared Three</link:label>
    <link:label id="lab_htgc_DividendDeclaredThreeMember_label_en-US" xlink:label="lab_htgc_DividendDeclaredThreeMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Dividend Declared Three [Member]</link:label>
    <link:label id="lab_htgc_DividendDeclaredThreeMember_documentation_en-US" xlink:label="lab_htgc_DividendDeclaredThreeMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Dividend Declared Three [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_DividendDeclaredThreeMember" xlink:href="htgc-20231231.xsd#htgc_DividendDeclaredThreeMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_DividendDeclaredThreeMember" xlink:to="lab_htgc_DividendDeclaredThreeMember" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_JanuaryTwoThousandTwentySevenNotesMember_739da186-de1b-4661-997a-8275f9b8520c_terseLabel_en-US" xlink:label="lab_htgc_JanuaryTwoThousandTwentySevenNotesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">January 2027 Notes</link:label>
    <link:label id="lab_htgc_JanuaryTwoThousandTwentySevenNotesMember_label_en-US" xlink:label="lab_htgc_JanuaryTwoThousandTwentySevenNotesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">January Two Thousand Twenty Seven Notes [Member]</link:label>
    <link:label id="lab_htgc_JanuaryTwoThousandTwentySevenNotesMember_documentation_en-US" xlink:label="lab_htgc_JanuaryTwoThousandTwentySevenNotesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">January two thousand twenty seven notes.</link:label>
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    <link:label id="lab_htgc_ElectronicsComputerHardwareMember_49577a22-8d29-4888-8221-445bdb5eb244_terseLabel_en-US" xlink:label="lab_htgc_ElectronicsComputerHardwareMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Electronics &amp; Computer Hardware</link:label>
    <link:label id="lab_htgc_ElectronicsComputerHardwareMember_label_en-US" xlink:label="lab_htgc_ElectronicsComputerHardwareMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Electronics Computer Hardware [Member]</link:label>
    <link:label id="lab_htgc_ElectronicsComputerHardwareMember_documentation_en-US" xlink:label="lab_htgc_ElectronicsComputerHardwareMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Electronics &amp; computer hardware.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_ElectronicsComputerHardwareMember" xlink:href="htgc-20231231.xsd#htgc_ElectronicsComputerHardwareMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_ElectronicsComputerHardwareMember" xlink:to="lab_htgc_ElectronicsComputerHardwareMember" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_BrainCorporationMember_826df742-d3a7-47e8-9304-5e7c575ed962_terseLabel_en-US" xlink:label="lab_htgc_BrainCorporationMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Brain Corporation</link:label>
    <link:label id="lab_htgc_BrainCorporationMember_label_en-US" xlink:label="lab_htgc_BrainCorporationMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Brain Corporation [Member]</link:label>
    <link:label id="lab_htgc_BrainCorporationMember_documentation_en-US" xlink:label="lab_htgc_BrainCorporationMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Brain corporation.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_BrainCorporationMember" xlink:href="htgc-20231231.xsd#htgc_BrainCorporationMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_BrainCorporationMember" xlink:to="lab_htgc_BrainCorporationMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_InvestmentBasisSpreadVariableRate_3e7f5e66-20fd-4b6b-b2ca-e9befa343eb3_terseLabel_en-US" xlink:label="lab_us-gaap_InvestmentBasisSpreadVariableRate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Basis spread variable rate</link:label>
    <link:label id="lab_us-gaap_InvestmentBasisSpreadVariableRate_b2b2dbde-10e7-4a61-ad3a-c6b3e29026f9_verboseLabel_en-US" xlink:label="lab_us-gaap_InvestmentBasisSpreadVariableRate" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investment, basis spread, variable rate</link:label>
    <link:label id="lab_us-gaap_InvestmentBasisSpreadVariableRate_label_en-US" xlink:label="lab_us-gaap_InvestmentBasisSpreadVariableRate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investment, Basis Spread, Variable Rate</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentBasisSpreadVariableRate" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InvestmentBasisSpreadVariableRate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InvestmentBasisSpreadVariableRate" xlink:to="lab_us-gaap_InvestmentBasisSpreadVariableRate" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_AuditorFirmId_2a1efc7b-d19e-4eb0-abc8-a7a371ccb7d3_terseLabel_en-US" xlink:label="lab_dei_AuditorFirmId" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" 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/2023/dei-2023.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_htgc_TechnologyMember_a51d158c-36af-42e8-b906-0ed44aa9a4f9_terseLabel_en-US" xlink:label="lab_htgc_TechnologyMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Technology</link:label>
    <link:label id="lab_htgc_TechnologyMember_label_en-US" xlink:label="lab_htgc_TechnologyMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Technology [Member]</link:label>
    <link:label id="lab_htgc_TechnologyMember_documentation_en-US" xlink:label="lab_htgc_TechnologyMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Technology.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_TechnologyMember" xlink:href="htgc-20231231.xsd#htgc_TechnologyMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_TechnologyMember" xlink:to="lab_htgc_TechnologyMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityShellCompany_9720db3a-24db-4929-bbba-31a856830c22_terseLabel_en-US" xlink:label="lab_dei_EntityShellCompany" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" 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/2023/dei-2023.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_htgc_YipitLLCMember_03230785-4022-4a92-b470-1e7fc2adae81_terseLabel_en-US" xlink:label="lab_htgc_YipitLLCMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Yipit, LLC</link:label>
    <link:label id="lab_htgc_YipitLLCMember_label_en-US" xlink:label="lab_htgc_YipitLLCMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Yipit L L C [Member]</link:label>
    <link:label id="lab_htgc_YipitLLCMember_documentation_en-US" xlink:label="lab_htgc_YipitLLCMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Yipit, LLC.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_YipitLLCMember" xlink:href="htgc-20231231.xsd#htgc_YipitLLCMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_YipitLLCMember" xlink:to="lab_htgc_YipitLLCMember" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_AlamarBiosciencesIncMember_8c1cff08-e33e-41e8-aded-0766a43a0e66_terseLabel_en-US" xlink:label="lab_htgc_AlamarBiosciencesIncMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Alamar Biosciences, Inc.</link:label>
    <link:label id="lab_htgc_AlamarBiosciencesIncMember_label_en-US" xlink:label="lab_htgc_AlamarBiosciencesIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Alamar Biosciences, Inc. [Member]</link:label>
    <link:label id="lab_htgc_AlamarBiosciencesIncMember_documentation_en-US" xlink:label="lab_htgc_AlamarBiosciencesIncMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Alamar Biosciences, Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_AlamarBiosciencesIncMember" xlink:href="htgc-20231231.xsd#htgc_AlamarBiosciencesIncMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_AlamarBiosciencesIncMember" xlink:to="lab_htgc_AlamarBiosciencesIncMember" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_OurSuccessDependsOnAttractingAndRetainingQualifiedPersonnelInACompetitiveEnvironmentMember_label_en-US" xlink:label="lab_htgc_OurSuccessDependsOnAttractingAndRetainingQualifiedPersonnelInACompetitiveEnvironmentMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Our success depends on attracting and retaining qualified personnel in a competitive environment [Member]</link:label>
    <link:label id="lab_htgc_OurSuccessDependsOnAttractingAndRetainingQualifiedPersonnelInACompetitiveEnvironmentMember_documentation_en-US" xlink:label="lab_htgc_OurSuccessDependsOnAttractingAndRetainingQualifiedPersonnelInACompetitiveEnvironmentMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Our success depends on attracting and retaining qualified personnel in a competitive environment [Member]</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_OurSuccessDependsOnAttractingAndRetainingQualifiedPersonnelInACompetitiveEnvironmentMember" xlink:to="lab_htgc_OurSuccessDependsOnAttractingAndRetainingQualifiedPersonnelInACompetitiveEnvironmentMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_e67972bb-aff1-4f93-a905-5313962e19cb_periodStartLabel_en-US" xlink:label="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cash, cash equivalents and restricted cash at beginning of period</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:to="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_FairValueByAssetClassAxis_18aa17dc-d04f-4ae3-bb2c-ff647bdab1a0_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueByAssetClassAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Asset Class</link:label>
    <link:label id="lab_us-gaap_FairValueByAssetClassAxis_label_en-US" xlink:label="lab_us-gaap_FairValueByAssetClassAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Asset Class [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByAssetClassAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueByAssetClassAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueByAssetClassAxis" xlink:to="lab_us-gaap_FairValueByAssetClassAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_DashlaneIncMember_85871372-4c8b-4532-81a6-9ff437ffd44c_terseLabel_en-US" xlink:label="lab_htgc_DashlaneIncMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Dashlane, Inc.</link:label>
    <link:label id="lab_htgc_DashlaneIncMember_label_en-US" xlink:label="lab_htgc_DashlaneIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Dashlane, Inc. [Member]</link:label>
    <link:label id="lab_htgc_DashlaneIncMember_documentation_en-US" xlink:label="lab_htgc_DashlaneIncMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Dashlane, Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_DashlaneIncMember" xlink:href="htgc-20231231.xsd#htgc_DashlaneIncMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_DashlaneIncMember" xlink:to="lab_htgc_DashlaneIncMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent_7f0323b7-5bf7-4c23-b782-1fbf59928005_terseLabel_en-US" xlink:label="lab_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accounts payable and accrued liabilities</link:label>
    <link:label id="lab_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent_label_en-US" xlink:label="lab_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accounts Payable and Accrued Liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent" xlink:to="lab_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_SemiconductorsMember_1b125600-f5e9-43b6-a056-320411df32fb_terseLabel_en-US" xlink:label="lab_htgc_SemiconductorsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Semiconductors</link:label>
    <link:label id="lab_htgc_SemiconductorsMember_label_en-US" xlink:label="lab_htgc_SemiconductorsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Semiconductors [Member]</link:label>
    <link:label id="lab_htgc_SemiconductorsMember_documentation_en-US" xlink:label="lab_htgc_SemiconductorsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Semiconductors.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_SemiconductorsMember" xlink:href="htgc-20231231.xsd#htgc_SemiconductorsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_SemiconductorsMember" xlink:to="lab_htgc_SemiconductorsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_PercentageOfInvestmentPortfolio_eae5b732-f56f-4d72-a49f-43da3fec1511_terseLabel_en-US" xlink:label="lab_htgc_PercentageOfInvestmentPortfolio" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Percentage of total investment portfolio</link:label>
    <link:label id="lab_htgc_PercentageOfInvestmentPortfolio_label_en-US" xlink:label="lab_htgc_PercentageOfInvestmentPortfolio" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Percentage Of Investment Portfolio</link:label>
    <link:label id="lab_htgc_PercentageOfInvestmentPortfolio_documentation_en-US" xlink:label="lab_htgc_PercentageOfInvestmentPortfolio" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Percentage of investment portfolio.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_PercentageOfInvestmentPortfolio" xlink:href="htgc-20231231.xsd#htgc_PercentageOfInvestmentPortfolio"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_PercentageOfInvestmentPortfolio" xlink:to="lab_htgc_PercentageOfInvestmentPortfolio" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_DividendDeclaredSixMember_9331b7c7-57ed-4134-9010-4d9bd2a5ea95_terseLabel_en-US" xlink:label="lab_htgc_DividendDeclaredSixMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Dividend Declared Six</link:label>
    <link:label id="lab_htgc_DividendDeclaredSixMember_label_en-US" xlink:label="lab_htgc_DividendDeclaredSixMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Dividend Declared Six [Member]</link:label>
    <link:label id="lab_htgc_DividendDeclaredSixMember_documentation_en-US" xlink:label="lab_htgc_DividendDeclaredSixMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Dividend Declared Six [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_DividendDeclaredSixMember" xlink:href="htgc-20231231.xsd#htgc_DividendDeclaredSixMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_DividendDeclaredSixMember" xlink:to="lab_htgc_DividendDeclaredSixMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_OperatingLeaseCost_cacf4540-6f56-4ec5-932f-b07eb5e2957b_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseCost" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total operating lease cost</link:label>
    <link:label id="lab_us-gaap_OperatingLeaseCost_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseCost" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Operating Lease, Cost</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseCost" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingLeaseCost"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeaseCost" xlink:to="lab_us-gaap_OperatingLeaseCost" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LongTermDebtMaturingInYearsFourAndFive_2a0f6a78-c7b7-4b35-b618-2be31758523d_terseLabel_en-US" xlink:label="lab_us-gaap_LongTermDebtMaturingInYearsFourAndFive" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Debt 3-5 years</link:label>
    <link:label id="lab_us-gaap_LongTermDebtMaturingInYearsFourAndFive_label_en-US" xlink:label="lab_us-gaap_LongTermDebtMaturingInYearsFourAndFive" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Long-Term Debt, Maturity, Year Four and Five</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturingInYearsFourAndFive" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongTermDebtMaturingInYearsFourAndFive"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LongTermDebtMaturingInYearsFourAndFive" xlink:to="lab_us-gaap_LongTermDebtMaturingInYearsFourAndFive" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract_12669dac-e9c7-45b4-a2fd-42505cd34da6_terseLabel_en-US" xlink:label="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Denominator</link:label>
    <link:label id="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract_label_en-US" xlink:label="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted Average Number of Shares Outstanding Reconciliation [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract" xlink:to="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_CommonStockSharesIssued_60fc8aaf-a78d-4e3f-b327-67408339263f_terseLabel_en-US" xlink:label="lab_us-gaap_CommonStockSharesIssued" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Common stock issued (in shares)</link:label>
    <link:label id="lab_us-gaap_CommonStockSharesIssued_label_en-US" xlink:label="lab_us-gaap_CommonStockSharesIssued" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Common Stock, Shares, Issued</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesIssued" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockSharesIssued"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CommonStockSharesIssued" xlink:to="lab_us-gaap_CommonStockSharesIssued" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_TheNotesAreUnsecuredAndThereforeEffectivelySubordinatedToAnyCurrentOrFutureSecuredIndebtednessMember_label_en-US" xlink:label="lab_htgc_TheNotesAreUnsecuredAndThereforeEffectivelySubordinatedToAnyCurrentOrFutureSecuredIndebtednessMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">The Notes are unsecured and therefore effectively subordinated to any current or future secured indebtedness [Member]</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_TheNotesAreUnsecuredAndThereforeEffectivelySubordinatedToAnyCurrentOrFutureSecuredIndebtednessMember" xlink:to="lab_htgc_TheNotesAreUnsecuredAndThereforeEffectivelySubordinatedToAnyCurrentOrFutureSecuredIndebtednessMember" xlink:type="arc" order="1"/>
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    <link:label id="lab_htgc_JuneTwoThousandTwentyFiveNotesMember_968a127a-477a-4373-85da-9840c84f970e_terseLabel_en-US" xlink:label="lab_htgc_JuneTwoThousandTwentyFiveNotesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">June 2025 Notes</link:label>
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    <link:label id="lab_htgc_JuneTwoThousandTwentyFiveNotesMember_documentation_en-US" xlink:label="lab_htgc_JuneTwoThousandTwentyFiveNotesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">June two thousand twenty five notes.</link:label>
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    <link:label id="lab_us-gaap_InvestmentOwnedBalanceShares_9cf36d07-fc02-4cb6-8a1f-0226f44182a0_terseLabel_en-US" xlink:label="lab_us-gaap_InvestmentOwnedBalanceShares" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Shares</link:label>
    <link:label id="lab_us-gaap_InvestmentOwnedBalanceShares_label_en-US" xlink:label="lab_us-gaap_InvestmentOwnedBalanceShares" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investment Owned, Balance, Shares</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentOwnedBalanceShares" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InvestmentOwnedBalanceShares"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InvestmentOwnedBalanceShares" xlink:to="lab_us-gaap_InvestmentOwnedBalanceShares" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_TwoThousandTwentyEightAssetBackedNotesMember_dbb7c408-45b9-44a0-87fc-27bad478cd7d_terseLabel_en-US" xlink:label="lab_htgc_TwoThousandTwentyEightAssetBackedNotesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">2028 Asset-Backed Notes</link:label>
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    <link:label id="lab_htgc_TwoThousandTwentyEightAssetBackedNotesMember_documentation_en-US" xlink:label="lab_htgc_TwoThousandTwentyEightAssetBackedNotesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Two thousand twenty eight asset-backed notes.</link:label>
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    <link:label id="lab_us-gaap_IncomeStatementAbstract_46f629b1-7109-45cc-8682-5e33e8085d82_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeStatementAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Income Statement [Abstract]</link:label>
    <link:label id="lab_us-gaap_IncomeStatementAbstract_label_en-US" xlink:label="lab_us-gaap_IncomeStatementAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Income Statement [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementAbstract"/>
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    <link:label id="lab_us-gaap_ScheduleOfInvestmentsLineItems_0d0ccae4-aeae-4806-bf9e-69e6510da3fa_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfInvestmentsLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule Of Investments [Line Items]</link:label>
    <link:label id="lab_us-gaap_ScheduleOfInvestmentsLineItems_label_en-US" xlink:label="lab_us-gaap_ScheduleOfInvestmentsLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Investments [Line Items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentsLineItems" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfInvestmentsLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems" xlink:to="lab_us-gaap_ScheduleOfInvestmentsLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_StockIssuedDuringPeriodSharesNewIssues_e7dbb4af-196c-485a-aad4-b2e724e5cdb0_verboseLabel_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodSharesNewIssues" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Public offering, net of offering expenses (in shares)</link:label>
    <link:label id="lab_us-gaap_StockIssuedDuringPeriodSharesNewIssues_c5e92708-d517-4a9c-a45e-057677ce1454_terseLabel_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodSharesNewIssues" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of Shares Issued (in shares)</link:label>
    <link:label id="lab_us-gaap_StockIssuedDuringPeriodSharesNewIssues_label_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodSharesNewIssues" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Stock Issued During Period, Shares, New Issues</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues" xlink:to="lab_us-gaap_StockIssuedDuringPeriodSharesNewIssues" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_BaseDividendMember_83189f77-0fe7-45c3-bd90-b97cba757094_terseLabel_en-US" xlink:label="lab_htgc_BaseDividendMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Base Dividend</link:label>
    <link:label id="lab_htgc_BaseDividendMember_label_en-US" xlink:label="lab_htgc_BaseDividendMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Base Dividend [Member]</link:label>
    <link:label id="lab_htgc_BaseDividendMember_documentation_en-US" xlink:label="lab_htgc_BaseDividendMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Base Dividend [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_BaseDividendMember" xlink:href="htgc-20231231.xsd#htgc_BaseDividendMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_BaseDividendMember" xlink:to="lab_htgc_BaseDividendMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ValuationTechniqueAxis_5c278b92-ed6a-4aba-8fc8-28d04291d601_terseLabel_en-US" xlink:label="lab_us-gaap_ValuationTechniqueAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Valuation Approach and Technique</link:label>
    <link:label id="lab_us-gaap_ValuationTechniqueAxis_label_en-US" xlink:label="lab_us-gaap_ValuationTechniqueAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Valuation Approach and Technique [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ValuationTechniqueAxis"/>
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    <link:label id="lab_htgc_EquityOfferingExpensesPolicyPolicyPolicyTextBlock_e0b5bf2f-d16a-4764-9e9e-d1ddeb344db3_terseLabel_en-US" xlink:label="lab_htgc_EquityOfferingExpensesPolicyPolicyPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Equity Offering Expenses</link:label>
    <link:label id="lab_htgc_EquityOfferingExpensesPolicyPolicyPolicyTextBlock_label_en-US" xlink:label="lab_htgc_EquityOfferingExpensesPolicyPolicyPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Equity Offering Expenses Policy Policy [Policy Text Block]</link:label>
    <link:label id="lab_htgc_EquityOfferingExpensesPolicyPolicyPolicyTextBlock_documentation_en-US" xlink:label="lab_htgc_EquityOfferingExpensesPolicyPolicyPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Equity offering expenses policy.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_EquityOfferingExpensesPolicyPolicyPolicyTextBlock" xlink:href="htgc-20231231.xsd#htgc_EquityOfferingExpensesPolicyPolicyPolicyTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_EquityOfferingExpensesPolicyPolicyPolicyTextBlock" xlink:to="lab_htgc_EquityOfferingExpensesPolicyPolicyPolicyTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_CashAndCashEquivalentsFairValueDisclosure_bf952041-ff42-4c23-8cd7-8ddc0bc8d0da_terseLabel_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsFairValueDisclosure" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cash and cash equivalents, fair value disclosure</link:label>
    <link:label id="lab_us-gaap_CashAndCashEquivalentsFairValueDisclosure_label_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsFairValueDisclosure" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cash and Cash Equivalents, Fair Value Disclosure</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CashAndCashEquivalentsFairValueDisclosure"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure" xlink:to="lab_us-gaap_CashAndCashEquivalentsFairValueDisclosure" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_AssetBackedNotes2017Member_label_en-US" xlink:label="lab_htgc_AssetBackedNotes2017Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Asset-Backed Notes 2017 [Member]</link:label>
    <link:label id="lab_htgc_AssetBackedNotes2017Member_documentation_en-US" xlink:label="lab_htgc_AssetBackedNotes2017Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Asset-Backed Notes 2017 [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_AssetBackedNotes2017Member" xlink:href="htgc-20231231.xsd#htgc_AssetBackedNotes2017Member"/>
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    <link:label id="lab_htgc_InvestmentCompanyDistributionToShareholdersPerShareExcludingCapitalShareTransactions_c7817715-9884-433b-8aab-f1100dd88e87_negatedLabel_en-US" xlink:label="lab_htgc_InvestmentCompanyDistributionToShareholdersPerShareExcludingCapitalShareTransactions" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Distributions of net investment income (in dollars per share)</link:label>
    <link:label id="lab_htgc_InvestmentCompanyDistributionToShareholdersPerShareExcludingCapitalShareTransactions_label_en-US" xlink:label="lab_htgc_InvestmentCompanyDistributionToShareholdersPerShareExcludingCapitalShareTransactions" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investment Company, Distribution To Shareholders, Per Share, Excluding Capital Share Transactions</link:label>
    <link:label id="lab_htgc_InvestmentCompanyDistributionToShareholdersPerShareExcludingCapitalShareTransactions_documentation_en-US" xlink:label="lab_htgc_InvestmentCompanyDistributionToShareholdersPerShareExcludingCapitalShareTransactions" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investment Company, Distribution To Shareholders, Per Share, Excluding Capital Share Transactions</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_InvestmentCompanyDistributionToShareholdersPerShareExcludingCapitalShareTransactions" xlink:href="htgc-20231231.xsd#htgc_InvestmentCompanyDistributionToShareholdersPerShareExcludingCapitalShareTransactions"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_InvestmentCompanyDistributionToShareholdersPerShareExcludingCapitalShareTransactions" xlink:to="lab_htgc_InvestmentCompanyDistributionToShareholdersPerShareExcludingCapitalShareTransactions" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_RVShareLLCMember_b3b9ad9b-abe9-4bb5-864f-08bc7c588113_terseLabel_en-US" xlink:label="lab_htgc_RVShareLLCMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">RVShare, LLC</link:label>
    <link:label id="lab_htgc_RVShareLLCMember_label_en-US" xlink:label="lab_htgc_RVShareLLCMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">R V Share L L C [Member]</link:label>
    <link:label id="lab_htgc_RVShareLLCMember_documentation_en-US" xlink:label="lab_htgc_RVShareLLCMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">RV Share, LLC.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_RVShareLLCMember" xlink:href="htgc-20231231.xsd#htgc_RVShareLLCMember"/>
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    <link:label id="lab_us-gaap_DerivativeLiabilities_6e287ad7-4669-4a37-9a68-9560b4ca1f43_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeLiabilities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Derivative liability</link:label>
    <link:label id="lab_us-gaap_DerivativeLiabilities_label_en-US" xlink:label="lab_us-gaap_DerivativeLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Derivative Liability</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeLiabilities" xlink:to="lab_us-gaap_DerivativeLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_AlladaptImmunotherapeuticsIncMember_f3643fd4-df20-498d-82d8-a834c8a5e325_terseLabel_en-US" xlink:label="lab_htgc_AlladaptImmunotherapeuticsIncMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Alladapt Immunotherapeutics Inc.</link:label>
    <link:label id="lab_htgc_AlladaptImmunotherapeuticsIncMember_label_en-US" xlink:label="lab_htgc_AlladaptImmunotherapeuticsIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Alladapt Immunotherapeutics Inc. [Member]</link:label>
    <link:label id="lab_htgc_AlladaptImmunotherapeuticsIncMember_documentation_en-US" xlink:label="lab_htgc_AlladaptImmunotherapeuticsIncMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Alladapt Immunotherapeutics Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_AlladaptImmunotherapeuticsIncMember" xlink:href="htgc-20231231.xsd#htgc_AlladaptImmunotherapeuticsIncMember"/>
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    <link:label id="lab_htgc_NumeratorForBasicAndDilutedChangeInNetAssetsPerCommonShareAbstract_ceff2f65-0b5c-4254-a45e-02d6106ad021_terseLabel_en-US" xlink:label="lab_htgc_NumeratorForBasicAndDilutedChangeInNetAssetsPerCommonShareAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Numerator</link:label>
    <link:label id="lab_htgc_NumeratorForBasicAndDilutedChangeInNetAssetsPerCommonShareAbstract_label_en-US" xlink:label="lab_htgc_NumeratorForBasicAndDilutedChangeInNetAssetsPerCommonShareAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Numerator For Basic And Diluted Change In Net Assets Per Common Share [Abstract]</link:label>
    <link:label id="lab_htgc_NumeratorForBasicAndDilutedChangeInNetAssetsPerCommonShareAbstract_documentation_en-US" xlink:label="lab_htgc_NumeratorForBasicAndDilutedChangeInNetAssetsPerCommonShareAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Numerator for basic and diluted change in net assets per common share.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_NumeratorForBasicAndDilutedChangeInNetAssetsPerCommonShareAbstract" xlink:href="htgc-20231231.xsd#htgc_NumeratorForBasicAndDilutedChangeInNetAssetsPerCommonShareAbstract"/>
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    <link:label id="lab_htgc_DividendDeclaredTwoMember_44aa510f-2837-4119-9820-793aeb41ad6f_terseLabel_en-US" xlink:label="lab_htgc_DividendDeclaredTwoMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Dividend Declared Two</link:label>
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    <link:label id="lab_us-gaap_PaymentsForRepurchaseOfCommonStock_f6762856-a94b-438a-b288-4816154f638a_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsForRepurchaseOfCommonStock" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Retirement of employee shares, net</link:label>
    <link:label id="lab_us-gaap_PaymentsForRepurchaseOfCommonStock_label_en-US" xlink:label="lab_us-gaap_PaymentsForRepurchaseOfCommonStock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Payments for Repurchase of Common Stock</link:label>
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    <link:label id="lab_htgc_CybermaxxIntermediateHoldingsIncMember_cb3aca1c-b54a-4c95-931d-dd33adfec988_terseLabel_en-US" xlink:label="lab_htgc_CybermaxxIntermediateHoldingsIncMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cybermaxx Intermediate Holdings, Inc.</link:label>
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    <link:label id="lab_dei_EntityCommonStockSharesOutstanding_adfed74f-b424-4f56-bee6-651fb7b7b3ad_terseLabel_en-US" xlink:label="lab_dei_EntityCommonStockSharesOutstanding" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Common Stock, Shares Outstanding</link:label>
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    <link:label id="lab_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_d531e964-7bea-45d8-8f65-b56f08e8b1e0_terseLabel_en-US" xlink:label="lab_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Supplemental disclosures of cash flow information and non-cash investing and financing activities:</link:label>
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    <link:label id="lab_htgc_NonCashRealizedLossExtinguishmentDebt_dd71b439-8de9-4d97-97f2-b2e460ab5356_terseLabel_en-US" xlink:label="lab_htgc_NonCashRealizedLossExtinguishmentDebt" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Realized loss on extinguishment of debt</link:label>
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    <link:label id="lab_htgc_NonCashRealizedLossExtinguishmentDebt_documentation_en-US" xlink:label="lab_htgc_NonCashRealizedLossExtinguishmentDebt" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Non-Cash portion of realized loss recognized upon extinguishment of debt.</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_NonCashRealizedLossExtinguishmentDebt" xlink:to="lab_htgc_NonCashRealizedLossExtinguishmentDebt" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_ComponentsOfDistributableEarningsOnTaxBasisTableTextBlock_ca184a77-e578-4740-a745-bb89bee39c32_terseLabel_en-US" xlink:label="lab_htgc_ComponentsOfDistributableEarningsOnTaxBasisTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Components of Distributable Earnings on a Tax Basis</link:label>
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    <link:label id="lab_us-gaap_FairValueByFairValueHierarchyLevelAxis_7ec2efc1-1359-4227-8d9a-48a4d6d6b7c9_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Fair Value Hierarchy and NAV</link:label>
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    <link:label id="lab_us-gaap_RetainedEarningsAccumulatedDeficit_23d8bc5b-60d0-4fbe-aef8-1119a6518c42_terseLabel_en-US" xlink:label="lab_us-gaap_RetainedEarningsAccumulatedDeficit" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total distributable earnings</link:label>
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    <link:label id="lab_us-gaap_CollateralDomain_5704b30b-e44d-49aa-a1a4-d6b4aac2f1e6_terseLabel_en-US" xlink:label="lab_us-gaap_CollateralDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Collateral Held [Domain]</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CollateralDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CollateralDomain" xlink:to="lab_us-gaap_CollateralDomain" xlink:type="arc" order="1"/>
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    <link:label id="lab_us-gaap_DebtInstrumentFaceAmount_0ef60ebe-96f5-41bb-8787-16907f17e0ec_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentFaceAmount" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Outstanding balance</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentFaceAmount_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentFaceAmount" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Debt Instrument, Face Amount</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentFaceAmount" xlink:to="lab_us-gaap_DebtInstrumentFaceAmount" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_OtherControlInvestmentsMember_1c3ea716-d687-4ec3-9b0d-94f806218236_terseLabel_en-US" xlink:label="lab_htgc_OtherControlInvestmentsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other Control Investments</link:label>
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    <link:label id="lab_htgc_OtherControlInvestmentsMember_documentation_en-US" xlink:label="lab_htgc_OtherControlInvestmentsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other Control Investments</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_OtherControlInvestmentsMember" xlink:href="htgc-20231231.xsd#htgc_OtherControlInvestmentsMember"/>
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    <link:label id="lab_htgc_WeightedAverageNumberOfSharesOutstandingBasicAndDilutedAbstract_f34bd983-c75b-441c-b9f6-53ee2a3f8148_terseLabel_en-US" xlink:label="lab_htgc_WeightedAverageNumberOfSharesOutstandingBasicAndDilutedAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted average shares outstanding:</link:label>
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    <link:label id="lab_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain_2c6f6883-7fb4-4faf-a562-a81fdc64ab1d_terseLabel_en-US" xlink:label="lab_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Equity Method Investment, Nonconsolidated Investee [Domain]</link:label>
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    <link:label id="lab_dei_EntityAddressStateOrProvince_45df597f-cf25-4bae-bc03-c606a86ae697_terseLabel_en-US" xlink:label="lab_dei_EntityAddressStateOrProvince" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Address, State or Province</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityAddressStateOrProvince" xlink:to="lab_dei_EntityAddressStateOrProvince" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_BaseAndSupplementalDividendMember_a3f426ab-22c5-4c5e-a02b-4fd24702cab7_terseLabel_en-US" xlink:label="lab_htgc_BaseAndSupplementalDividendMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Base And Supplemental Dividend</link:label>
    <link:label id="lab_htgc_BaseAndSupplementalDividendMember_label_en-US" xlink:label="lab_htgc_BaseAndSupplementalDividendMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Base And Supplemental Dividend [Member]</link:label>
    <link:label id="lab_htgc_BaseAndSupplementalDividendMember_documentation_en-US" xlink:label="lab_htgc_BaseAndSupplementalDividendMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Base And Supplemental Dividend [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_BaseAndSupplementalDividendMember" xlink:href="htgc-20231231.xsd#htgc_BaseAndSupplementalDividendMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_BaseAndSupplementalDividendMember" xlink:to="lab_htgc_BaseAndSupplementalDividendMember" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_InformationServicesMember_f95f0a74-f677-49b5-ace1-fc232f749f3f_terseLabel_en-US" xlink:label="lab_htgc_InformationServicesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Information Services</link:label>
    <link:label id="lab_htgc_InformationServicesMember_label_en-US" xlink:label="lab_htgc_InformationServicesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Information Services [Member]</link:label>
    <link:label id="lab_htgc_InformationServicesMember_documentation_en-US" xlink:label="lab_htgc_InformationServicesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Information services.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_InformationServicesMember" xlink:href="htgc-20231231.xsd#htgc_InformationServicesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_InformationServicesMember" xlink:to="lab_htgc_InformationServicesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_49679a98-7450-4b5c-99cd-6be2f7c9d064_terseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cash flows from (used in) operating activities:</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Net Cash Provided by (Used in) Operating Activities [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_ScheduleOfUnamortizedCapitalizedFeeIncomeTableTextBlock_ed9903ed-bb4f-41b5-a311-822b57cefa90_terseLabel_en-US" xlink:label="lab_htgc_ScheduleOfUnamortizedCapitalizedFeeIncomeTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Unamortized Capitalized Fee Income</link:label>
    <link:label id="lab_htgc_ScheduleOfUnamortizedCapitalizedFeeIncomeTableTextBlock_label_en-US" xlink:label="lab_htgc_ScheduleOfUnamortizedCapitalizedFeeIncomeTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule Of Unamortized Capitalized Fee Income [Table Text Block]</link:label>
    <link:label id="lab_htgc_ScheduleOfUnamortizedCapitalizedFeeIncomeTableTextBlock_documentation_en-US" xlink:label="lab_htgc_ScheduleOfUnamortizedCapitalizedFeeIncomeTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule Of Unamortized Capitalized Fee Income</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_ScheduleOfUnamortizedCapitalizedFeeIncomeTableTextBlock" xlink:href="htgc-20231231.xsd#htgc_ScheduleOfUnamortizedCapitalizedFeeIncomeTableTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_ScheduleOfUnamortizedCapitalizedFeeIncomeTableTextBlock" xlink:to="lab_htgc_ScheduleOfUnamortizedCapitalizedFeeIncomeTableTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_AccretionAmortizationOfDiscountsAndPremiumsInvestmentsConvertibleNotes_c0e3b0eb-ffda-4b34-9f47-59bd3a151094_negatedTerseLabel_en-US" xlink:label="lab_htgc_AccretionAmortizationOfDiscountsAndPremiumsInvestmentsConvertibleNotes" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accretion of loan discount on convertible notes</link:label>
    <link:label id="lab_htgc_AccretionAmortizationOfDiscountsAndPremiumsInvestmentsConvertibleNotes_label_en-US" xlink:label="lab_htgc_AccretionAmortizationOfDiscountsAndPremiumsInvestmentsConvertibleNotes" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accretion (Amortization) Of Discounts And Premiums, Investments, Convertible Notes</link:label>
    <link:label id="lab_htgc_AccretionAmortizationOfDiscountsAndPremiumsInvestmentsConvertibleNotes_documentation_en-US" xlink:label="lab_htgc_AccretionAmortizationOfDiscountsAndPremiumsInvestmentsConvertibleNotes" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accretion (Amortization) Of Discounts And Premiums, Investments, Convertible Notes</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_AccretionAmortizationOfDiscountsAndPremiumsInvestmentsConvertibleNotes" xlink:href="htgc-20231231.xsd#htgc_AccretionAmortizationOfDiscountsAndPremiumsInvestmentsConvertibleNotes"/>
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    <link:label id="lab_htgc_InvestmentCompanyCapitalShareTransactionIncreaseDecreasePerShare_29949104-9320-4762-a393-f22a977183e9_terseLabel_en-US" xlink:label="lab_htgc_InvestmentCompanyCapitalShareTransactionIncreaseDecreasePerShare" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Net increase (decrease) in net assets from capital share transactions (in dollars per share)</link:label>
    <link:label id="lab_htgc_InvestmentCompanyCapitalShareTransactionIncreaseDecreasePerShare_label_en-US" xlink:label="lab_htgc_InvestmentCompanyCapitalShareTransactionIncreaseDecreasePerShare" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investment Company, Capital Share Transaction, Increase (Decrease), Per Share</link:label>
    <link:label id="lab_htgc_InvestmentCompanyCapitalShareTransactionIncreaseDecreasePerShare_documentation_en-US" xlink:label="lab_htgc_InvestmentCompanyCapitalShareTransactionIncreaseDecreasePerShare" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investment Company, Capital Share Transaction, Increase (Decrease), Per Share</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_InvestmentCompanyCapitalShareTransactionIncreaseDecreasePerShare" xlink:href="htgc-20231231.xsd#htgc_InvestmentCompanyCapitalShareTransactionIncreaseDecreasePerShare"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_InvestmentCompanyCapitalShareTransactionIncreaseDecreasePerShare" xlink:to="lab_htgc_InvestmentCompanyCapitalShareTransactionIncreaseDecreasePerShare" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_Notes2025Member_label_en-US" xlink:label="lab_htgc_Notes2025Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Notes 2025 [Member]</link:label>
    <link:label id="lab_htgc_Notes2025Member_documentation_en-US" xlink:label="lab_htgc_Notes2025Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Notes 2025 [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_Notes2025Member" xlink:href="htgc-20231231.xsd#htgc_Notes2025Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_Notes2025Member" xlink:to="lab_htgc_Notes2025Member" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_EarningPerShareBasicAndDilutedAbstract_f2db3b9c-a358-46ba-abd9-ebc7b989d695_terseLabel_en-US" xlink:label="lab_htgc_EarningPerShareBasicAndDilutedAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Change in net assets resulting from operations per common share:</link:label>
    <link:label id="lab_htgc_EarningPerShareBasicAndDilutedAbstract_label_en-US" xlink:label="lab_htgc_EarningPerShareBasicAndDilutedAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Earning Per Share Basic And Diluted [Abstract]</link:label>
    <link:label id="lab_htgc_EarningPerShareBasicAndDilutedAbstract_documentation_en-US" xlink:label="lab_htgc_EarningPerShareBasicAndDilutedAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Earning per share basic And diluted.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_EarningPerShareBasicAndDilutedAbstract" xlink:href="htgc-20231231.xsd#htgc_EarningPerShareBasicAndDilutedAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_EarningPerShareBasicAndDilutedAbstract" xlink:to="lab_htgc_EarningPerShareBasicAndDilutedAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_InvestmentCompanyPortfolioTurnover_14267fc9-5fb9-433e-8cff-0b1884b7cd6b_terseLabel_en-US" xlink:label="lab_us-gaap_InvestmentCompanyPortfolioTurnover" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Portfolio turnover rate</link:label>
    <link:label id="lab_us-gaap_InvestmentCompanyPortfolioTurnover_label_en-US" xlink:label="lab_us-gaap_InvestmentCompanyPortfolioTurnover" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investment Company, Portfolio Turnover</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentCompanyPortfolioTurnover" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InvestmentCompanyPortfolioTurnover"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InvestmentCompanyPortfolioTurnover" xlink:to="lab_us-gaap_InvestmentCompanyPortfolioTurnover" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_ChangeInNetAssetsPerCommonShareAbstract_94f9a744-82b3-47d2-9ad7-7c74a3182677_terseLabel_en-US" xlink:label="lab_htgc_ChangeInNetAssetsPerCommonShareAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Change in net assets per common share:</link:label>
    <link:label id="lab_htgc_ChangeInNetAssetsPerCommonShareAbstract_label_en-US" xlink:label="lab_htgc_ChangeInNetAssetsPerCommonShareAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Change In Net Assets Per Common Share [Abstract]</link:label>
    <link:label id="lab_htgc_ChangeInNetAssetsPerCommonShareAbstract_documentation_en-US" xlink:label="lab_htgc_ChangeInNetAssetsPerCommonShareAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Change in net assets per common share.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_ChangeInNetAssetsPerCommonShareAbstract" xlink:href="htgc-20231231.xsd#htgc_ChangeInNetAssetsPerCommonShareAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_ChangeInNetAssetsPerCommonShareAbstract" xlink:to="lab_htgc_ChangeInNetAssetsPerCommonShareAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_UndistributedEarningsLossAvailableToCommonShareholdersBasic_3b43814d-630d-466e-bf97-b0cbbc6bb7cf_totalLabel_en-US" xlink:label="lab_us-gaap_UndistributedEarningsLossAvailableToCommonShareholdersBasic" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total Earnings, net of total distributions</link:label>
    <link:label id="lab_us-gaap_UndistributedEarningsLossAvailableToCommonShareholdersBasic_label_en-US" xlink:label="lab_us-gaap_UndistributedEarningsLossAvailableToCommonShareholdersBasic" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Undistributed Earnings (Loss) Available to Common Shareholders, Basic</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UndistributedEarningsLossAvailableToCommonShareholdersBasic" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_UndistributedEarningsLossAvailableToCommonShareholdersBasic"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_UndistributedEarningsLossAvailableToCommonShareholdersBasic" xlink:to="lab_us-gaap_UndistributedEarningsLossAvailableToCommonShareholdersBasic" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_InvestmentCompanyRegulatedStatus_1c66e425-eb23-4dc6-b057-fa4a0f9ff3aa_terseLabel_en-US" xlink:label="lab_us-gaap_InvestmentCompanyRegulatedStatus" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investment company regulated status</link:label>
    <link:label id="lab_us-gaap_InvestmentCompanyRegulatedStatus_label_en-US" xlink:label="lab_us-gaap_InvestmentCompanyRegulatedStatus" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investment Company, Regulated Status [true false]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentCompanyRegulatedStatus" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InvestmentCompanyRegulatedStatus"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InvestmentCompanyRegulatedStatus" xlink:to="lab_us-gaap_InvestmentCompanyRegulatedStatus" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_MeasurementInputDiscountForLackOfMarketabilityMember_225c3271-1643-43b3-b8cd-5ad9ec00c97a_terseLabel_en-US" xlink:label="lab_us-gaap_MeasurementInputDiscountForLackOfMarketabilityMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Discount for Lack of Marketability</link:label>
    <link:label id="lab_us-gaap_MeasurementInputDiscountForLackOfMarketabilityMember_label_en-US" xlink:label="lab_us-gaap_MeasurementInputDiscountForLackOfMarketabilityMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Measurement Input, Discount for Lack of Marketability [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputDiscountForLackOfMarketabilityMember" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_MeasurementInputDiscountForLackOfMarketabilityMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_MeasurementInputDiscountForLackOfMarketabilityMember" xlink:to="lab_us-gaap_MeasurementInputDiscountForLackOfMarketabilityMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_cca17158-82c4-49a6-bbdb-adf29d73d0c3_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Asset Class</link:label>
    <link:label id="lab_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_label_en-US" xlink:label="lab_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Asset Class [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
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    <link:label id="lab_htgc_HerculesCapitalFourLPMember_0349805f-75d4-452d-89e4-50fac9c9c4c1_terseLabel_en-US" xlink:label="lab_htgc_HerculesCapitalFourLPMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">HC IV</link:label>
    <link:label id="lab_htgc_HerculesCapitalFourLPMember_label_en-US" xlink:label="lab_htgc_HerculesCapitalFourLPMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Hercules Capital Four L P [Member]</link:label>
    <link:label id="lab_htgc_HerculesCapitalFourLPMember_documentation_en-US" xlink:label="lab_htgc_HerculesCapitalFourLPMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Hercules capital four, L.P.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_HerculesCapitalFourLPMember" xlink:href="htgc-20231231.xsd#htgc_HerculesCapitalFourLPMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_HerculesCapitalFourLPMember" xlink:to="lab_htgc_HerculesCapitalFourLPMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ClassOfStockDomain_3c2467af-a08a-4e25-a864-714b4d976557_terseLabel_en-US" xlink:label="lab_us-gaap_ClassOfStockDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Class of Stock</link:label>
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    <link:label id="lab_us-gaap_InvestmentCompanyAbstract_b9fb0524-586e-4f8a-b68b-6d3993c04198_terseLabel_en-US" xlink:label="lab_us-gaap_InvestmentCompanyAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investment Company [Abstract]</link:label>
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    <link:label id="lab_htgc_PerformanceVestingAwardMember_c325c11a-b405-4c99-9e93-bb83681c205f_terseLabel_en-US" xlink:label="lab_htgc_PerformanceVestingAwardMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Performance Vesting Award</link:label>
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    <link:label id="lab_htgc_PerformanceVestingAwardMember_documentation_en-US" xlink:label="lab_htgc_PerformanceVestingAwardMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Performance Vesting Award [Member]</link:label>
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    <link:label id="lab_us-gaap_InvestmentOwnedAtFairValue_70227cb5-930a-4b05-b84c-7df04942999e_terseLabel_en-US" xlink:label="lab_us-gaap_InvestmentOwnedAtFairValue" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investments, at fair value:</link:label>
    <link:label id="lab_us-gaap_InvestmentOwnedAtFairValue_61f26235-6fde-47ac-a900-5a61e5c94111_verboseLabel_en-US" xlink:label="lab_us-gaap_InvestmentOwnedAtFairValue" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investments at Fair Value</link:label>
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    <link:label id="lab_us-gaap_InvestmentOwnedAtFairValue_10e57ff3-2238-4069-9dea-f2168ae470c1_periodStartLabel_en-US" xlink:label="lab_us-gaap_InvestmentOwnedAtFairValue" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Fair value beginning balance</link:label>
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    <link:label id="lab_us-gaap_OperatingLeaseLiability_ecca99ec-2cd5-4047-a343-274b9bc75bb7_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiability" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Operating lease liability</link:label>
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    <link:label id="lab_us-gaap_OperatingLeaseLiability_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiability" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Operating Lease, Liability</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeaseLiability" xlink:to="lab_us-gaap_OperatingLeaseLiability" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_WeMayExperienceFluctuationsInOurQuarterlyOperatingResultsMember_label_en-US" xlink:label="lab_htgc_WeMayExperienceFluctuationsInOurQuarterlyOperatingResultsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">We May Experience Fluctuations In Our Quarterly Operating Results [Member]</link:label>
    <link:label id="lab_htgc_WeMayExperienceFluctuationsInOurQuarterlyOperatingResultsMember_documentation_en-US" xlink:label="lab_htgc_WeMayExperienceFluctuationsInOurQuarterlyOperatingResultsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">We may experience fluctuations in our quarterly operating results.</link:label>
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    <link:label id="lab_htgc_StreamlineHealthcareSolutionsMember_d5e73cf6-7315-404f-a28c-b021dc23c5ba_terseLabel_en-US" xlink:label="lab_htgc_StreamlineHealthcareSolutionsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Streamline Healthcare Solutions</link:label>
    <link:label id="lab_htgc_StreamlineHealthcareSolutionsMember_label_en-US" xlink:label="lab_htgc_StreamlineHealthcareSolutionsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Streamline Healthcare Solutions [Member]</link:label>
    <link:label id="lab_htgc_StreamlineHealthcareSolutionsMember_documentation_en-US" xlink:label="lab_htgc_StreamlineHealthcareSolutionsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Streamline Healthcare Solutions [Member]</link:label>
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    <link:label id="lab_htgc_Notes2024Member_label_en-US" xlink:label="lab_htgc_Notes2024Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Notes 2024 [Member]</link:label>
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    <link:label id="lab_us-gaap_VestingDomain_9646c8ff-a6bb-47f3-adeb-7aebe3f49be9_terseLabel_en-US" xlink:label="lab_us-gaap_VestingDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Vesting [Domain]</link:label>
    <link:label id="lab_us-gaap_VestingDomain_label_en-US" xlink:label="lab_us-gaap_VestingDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Vesting [Domain]</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_VestingDomain" xlink:to="lab_us-gaap_VestingDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_LiabilityClassifiedAwardsMember_3543c419-da61-4d4c-94cd-21c1ca96c978_terseLabel_en-US" xlink:label="lab_htgc_LiabilityClassifiedAwardsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Liability Classified Awards</link:label>
    <link:label id="lab_htgc_LiabilityClassifiedAwardsMember_label_en-US" xlink:label="lab_htgc_LiabilityClassifiedAwardsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Liability Classified Awards [Member]</link:label>
    <link:label id="lab_htgc_LiabilityClassifiedAwardsMember_documentation_en-US" xlink:label="lab_htgc_LiabilityClassifiedAwardsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Liability Classified Awards [Member]</link:label>
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    <link:label id="lab_htgc_ExcludingCashAndCashEquivalentMember_44aa5448-ea2c-4c2c-9f2d-868d8fc01f54_terseLabel_en-US" xlink:label="lab_htgc_ExcludingCashAndCashEquivalentMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total Investments, at fair value</link:label>
    <link:label id="lab_htgc_ExcludingCashAndCashEquivalentMember_label_en-US" xlink:label="lab_htgc_ExcludingCashAndCashEquivalentMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Excluding Cash And Cash Equivalent [Member]</link:label>
    <link:label id="lab_htgc_ExcludingCashAndCashEquivalentMember_documentation_en-US" xlink:label="lab_htgc_ExcludingCashAndCashEquivalentMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Excluding Cash And Cash Equivalent Member</link:label>
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    <link:label id="lab_htgc_DistributionsReinvested_9b6731ec-364c-4840-9289-88868ab4ba78_terseLabel_en-US" xlink:label="lab_htgc_DistributionsReinvested" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Distributions reinvested</link:label>
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    <link:label id="lab_htgc_DistributionsReinvested_documentation_en-US" xlink:label="lab_htgc_DistributionsReinvested" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Distributions reinvested.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_DistributionsReinvested" xlink:href="htgc-20231231.xsd#htgc_DistributionsReinvested"/>
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    <link:label id="lab_htgc_InvestmentsMaturityMonthAndYear_fa6abb1b-1da3-4966-8328-aed69acad2e4_terseLabel_en-US" xlink:label="lab_htgc_InvestmentsMaturityMonthAndYear" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Maturity Date</link:label>
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    <link:label id="lab_htgc_InvestmentsMaturityMonthAndYear_documentation_en-US" xlink:label="lab_htgc_InvestmentsMaturityMonthAndYear" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investments Maturity Month and Year.</link:label>
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    <link:label id="lab_us-gaap_PlanNameAxis_e1d50b9a-49c2-4885-b2d0-dd2cf26f5fc2_terseLabel_en-US" xlink:label="lab_us-gaap_PlanNameAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Plan Name</link:label>
    <link:label id="lab_us-gaap_PlanNameAxis_label_en-US" xlink:label="lab_us-gaap_PlanNameAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Plan Name [Axis]</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PlanNameAxis" xlink:to="lab_us-gaap_PlanNameAxis" xlink:type="arc" order="1"/>
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    <link:label id="lab_htgc_WeightedAverageDebtPerCommonShare_documentation_en-US" xlink:label="lab_htgc_WeightedAverageDebtPerCommonShare" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted average debt per common share.</link:label>
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    <link:label id="lab_us-gaap_DebtDisclosureAbstract_db2db462-a675-4f37-8ff7-038c3dd44f02_terseLabel_en-US" xlink:label="lab_us-gaap_DebtDisclosureAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Debt Disclosure [Abstract]</link:label>
    <link:label id="lab_us-gaap_DebtDisclosureAbstract_label_en-US" xlink:label="lab_us-gaap_DebtDisclosureAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Debt Disclosure [Abstract]</link:label>
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    <link:label id="lab_us-gaap_EarningsPerShareAbstract_fb92cca4-93b1-4595-aed3-068b75a3b52c_terseLabel_en-US" xlink:label="lab_us-gaap_EarningsPerShareAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Earnings Per Share [Abstract]</link:label>
    <link:label id="lab_us-gaap_EarningsPerShareAbstract_label_en-US" xlink:label="lab_us-gaap_EarningsPerShareAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Earnings Per Share [Abstract]</link:label>
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    <link:label id="lab_htgc_TecturaCorporationMember_edbe87f7-7319-4d32-89a2-2d3c3cdf798d_terseLabel_en-US" xlink:label="lab_htgc_TecturaCorporationMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Tectura Corporation</link:label>
    <link:label id="lab_htgc_TecturaCorporationMember_label_en-US" xlink:label="lab_htgc_TecturaCorporationMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Tectura Corporation [Member]</link:label>
    <link:label id="lab_htgc_TecturaCorporationMember_documentation_en-US" xlink:label="lab_htgc_TecturaCorporationMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Tectura corporation.</link:label>
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    <link:label id="lab_us-gaap_CommonStockValue_7aca8c55-3c9b-45a7-8242-8cd39ba125fc_terseLabel_en-US" xlink:label="lab_us-gaap_CommonStockValue" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Common stock, par value</link:label>
    <link:label id="lab_us-gaap_CommonStockValue_label_en-US" xlink:label="lab_us-gaap_CommonStockValue" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Common Stock, Value, Issued</link:label>
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    <link:label id="lab_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_8b26af7b-fb38-419c-afc6-7ef006bbed45_terseLabel_en-US" xlink:label="lab_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Organization, Consolidation and Presentation of Financial Statements [Abstract]</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract"/>
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    <link:label id="lab_us-gaap_RestrictedCash_48bb658d-d30b-436d-938b-dab7aecbbb40_terseLabel_en-US" xlink:label="lab_us-gaap_RestrictedCash" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Restricted cash (amounts related to a VIE $17,114 and $10,079, respectively)</link:label>
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    <link:label id="lab_us-gaap_RestrictedCash_label_en-US" xlink:label="lab_us-gaap_RestrictedCash" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Restricted Cash</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCash" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestrictedCash"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RestrictedCash" xlink:to="lab_us-gaap_RestrictedCash" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityFilerCategory_1f4232b7-f440-418e-9474-04e894eb1a78_terseLabel_en-US" xlink:label="lab_dei_EntityFilerCategory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" 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/2023/dei-2023.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_htgc_WeThroughOurWhollyOwnedSubsidiaryIssueDebtSecuritiesGuaranteedByTheSbaAndSoldInTheCapitalMarketsMember_label_en-US" xlink:label="lab_htgc_WeThroughOurWhollyOwnedSubsidiaryIssueDebtSecuritiesGuaranteedByTheSbaAndSoldInTheCapitalMarketsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">We, Through Our Wholly Owned Subsidiary, Issue Debt Securities Guaranteed By The SBA And Sold In The Capital Markets [Member]</link:label>
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    <link:label id="lab_htgc_CountPortfolioCompaniesGreaterThanFivePercent_1a361892-e8df-40b2-856d-7e3c6efa5585_terseLabel_en-US" xlink:label="lab_htgc_CountPortfolioCompaniesGreaterThanFivePercent" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of portfolio companies</link:label>
    <link:label id="lab_htgc_CountPortfolioCompaniesGreaterThanFivePercent_label_en-US" xlink:label="lab_htgc_CountPortfolioCompaniesGreaterThanFivePercent" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Count Portfolio Companies Greater Than Five Percent</link:label>
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    <link:label id="lab_us-gaap_StatementTable_55a2c53b-9b14-4bd2-8c18-590dbd450cf5_terseLabel_en-US" xlink:label="lab_us-gaap_StatementTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Statement [Table]</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementTable"/>
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    <link:label id="lab_us-gaap_InvestmentInterestRateFloor_5a5a255b-1c0f-4cab-b1c1-63aecf1b038a_terseLabel_en-US" xlink:label="lab_us-gaap_InvestmentInterestRateFloor" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Interest rate floor</link:label>
    <link:label id="lab_us-gaap_InvestmentInterestRateFloor_label_en-US" xlink:label="lab_us-gaap_InvestmentInterestRateFloor" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investment, Interest Rate, Floor</link:label>
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    <link:label id="lab_us-gaap_TaxBasisOfInvestmentsGrossUnrealizedDepreciation_70fc0f73-1bf2-4f83-81d0-e462da8f120c_terseLabel_en-US" xlink:label="lab_us-gaap_TaxBasisOfInvestmentsGrossUnrealizedDepreciation" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Tax basis of investments, gross, unrealized depreciation</link:label>
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    <link:label id="lab_htgc_G1TherapeuticsIncMember_46407922-8cf6-4857-bd1a-a9e8aa78eaeb_terseLabel_en-US" xlink:label="lab_htgc_G1TherapeuticsIncMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">G1 Therapeutics, Inc.</link:label>
    <link:label id="lab_htgc_G1TherapeuticsIncMember_label_en-US" xlink:label="lab_htgc_G1TherapeuticsIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">G1 Therapeutics Inc [Member]</link:label>
    <link:label id="lab_htgc_G1TherapeuticsIncMember_documentation_en-US" xlink:label="lab_htgc_G1TherapeuticsIncMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">G1 Therapeutics, Inc.</link:label>
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    <link:label id="lab_htgc_PercentageOfAssetsHeld_54778674-d47b-49e1-8787-ba55565e8728_terseLabel_en-US" xlink:label="lab_htgc_PercentageOfAssetsHeld" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Percentage of total assets held</link:label>
    <link:label id="lab_htgc_PercentageOfAssetsHeld_label_en-US" xlink:label="lab_htgc_PercentageOfAssetsHeld" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Percentage Of Assets Held</link:label>
    <link:label id="lab_htgc_PercentageOfAssetsHeld_documentation_en-US" xlink:label="lab_htgc_PercentageOfAssetsHeld" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Percentage of assets held.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_PercentageOfAssetsHeld" xlink:href="htgc-20231231.xsd#htgc_PercentageOfAssetsHeld"/>
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    <link:label id="lab_us-gaap_FairValueByBalanceSheetGroupingTable_b76052bd-628f-4785-bef8-4395e8facaa9_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueByBalanceSheetGroupingTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Fair Value By Balance Sheet Grouping [Table]</link:label>
    <link:label id="lab_us-gaap_FairValueByBalanceSheetGroupingTable_label_en-US" xlink:label="lab_us-gaap_FairValueByBalanceSheetGroupingTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Fair Value, by Balance Sheet Grouping [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByBalanceSheetGroupingTable" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueByBalanceSheetGroupingTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable" xlink:to="lab_us-gaap_FairValueByBalanceSheetGroupingTable" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DebtPolicyTextBlock_1233dd19-97de-48d7-8e89-4d05f5fe12b0_terseLabel_en-US" xlink:label="lab_us-gaap_DebtPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Debt</link:label>
    <link:label id="lab_us-gaap_DebtPolicyTextBlock_label_en-US" xlink:label="lab_us-gaap_DebtPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Debt, Policy [Policy Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtPolicyTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtPolicyTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtPolicyTextBlock" xlink:to="lab_us-gaap_DebtPolicyTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_DrugDeliveryMember_c256a674-ccfe-420e-9877-6d0e5864407f_terseLabel_en-US" xlink:label="lab_htgc_DrugDeliveryMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Drug Delivery</link:label>
    <link:label id="lab_htgc_DrugDeliveryMember_label_en-US" xlink:label="lab_htgc_DrugDeliveryMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Drug Delivery [Member]</link:label>
    <link:label id="lab_htgc_DrugDeliveryMember_documentation_en-US" xlink:label="lab_htgc_DrugDeliveryMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Drug delivery.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_DrugDeliveryMember" xlink:href="htgc-20231231.xsd#htgc_DrugDeliveryMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_DrugDeliveryMember" xlink:to="lab_htgc_DrugDeliveryMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ContractualObligationDueInNextTwelveMonths_21d1de5e-6593-4d80-afd2-93f18755a32f_terseLabel_en-US" xlink:label="lab_us-gaap_ContractualObligationDueInNextTwelveMonths" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Contractual Obligations Less than 1 year</link:label>
    <link:label id="lab_us-gaap_ContractualObligationDueInNextTwelveMonths_label_en-US" xlink:label="lab_us-gaap_ContractualObligationDueInNextTwelveMonths" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Contractual Obligation, to be Paid, Year One</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractualObligationDueInNextTwelveMonths" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ContractualObligationDueInNextTwelveMonths"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ContractualObligationDueInNextTwelveMonths" xlink:to="lab_us-gaap_ContractualObligationDueInNextTwelveMonths" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_DebtIssuanceCostsPolicyPolicyPolicyTextBlock_2f884fe4-8484-4b02-ac6b-6a35344e137f_terseLabel_en-US" xlink:label="lab_htgc_DebtIssuanceCostsPolicyPolicyPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Debt Issuance Costs</link:label>
    <link:label id="lab_htgc_DebtIssuanceCostsPolicyPolicyPolicyTextBlock_label_en-US" xlink:label="lab_htgc_DebtIssuanceCostsPolicyPolicyPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Debt Issuance Costs Policy Policy [Policy Text Block]</link:label>
    <link:label id="lab_htgc_DebtIssuanceCostsPolicyPolicyPolicyTextBlock_documentation_en-US" xlink:label="lab_htgc_DebtIssuanceCostsPolicyPolicyPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Debt issuance costs policy.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_DebtIssuanceCostsPolicyPolicyPolicyTextBlock" xlink:href="htgc-20231231.xsd#htgc_DebtIssuanceCostsPolicyPolicyPolicyTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_DebtIssuanceCostsPolicyPolicyPolicyTextBlock" xlink:to="lab_htgc_DebtIssuanceCostsPolicyPolicyPolicyTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_SurgicalDevicesMember_74fd85f7-47a5-4559-a7a5-4a201f1bd04b_terseLabel_en-US" xlink:label="lab_htgc_SurgicalDevicesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Surgical Devices</link:label>
    <link:label id="lab_htgc_SurgicalDevicesMember_label_en-US" xlink:label="lab_htgc_SurgicalDevicesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Surgical Devices [Member]</link:label>
    <link:label id="lab_htgc_SurgicalDevicesMember_documentation_en-US" xlink:label="lab_htgc_SurgicalDevicesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Surgical devices.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_SurgicalDevicesMember" xlink:href="htgc-20231231.xsd#htgc_SurgicalDevicesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_SurgicalDevicesMember" xlink:to="lab_htgc_SurgicalDevicesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_NatureOfOperations_e844fc06-25e7-46df-8662-770e50e32dd3_terseLabel_en-US" xlink:label="lab_us-gaap_NatureOfOperations" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Description of Business</link:label>
    <link:label id="lab_us-gaap_NatureOfOperations_label_en-US" xlink:label="lab_us-gaap_NatureOfOperations" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Nature of Operations [Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NatureOfOperations" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NatureOfOperations"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NatureOfOperations" xlink:to="lab_us-gaap_NatureOfOperations" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_WeMayNotBeAbleToPrepayTheNotesOrCreditFacilitiesUponAChangeInControlMember_label_en-US" xlink:label="lab_htgc_WeMayNotBeAbleToPrepayTheNotesOrCreditFacilitiesUponAChangeInControlMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">We May Not Be Able To Prepay The Notes Or Credit Facilities Upon A Change In Control [Member]</link:label>
    <link:label id="lab_htgc_WeMayNotBeAbleToPrepayTheNotesOrCreditFacilitiesUponAChangeInControlMember_documentation_en-US" xlink:label="lab_htgc_WeMayNotBeAbleToPrepayTheNotesOrCreditFacilitiesUponAChangeInControlMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">We may not be able to prepay the notes or credit facilities upon a change in control.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_WeMayNotBeAbleToPrepayTheNotesOrCreditFacilitiesUponAChangeInControlMember" xlink:href="htgc-20231231.xsd#htgc_WeMayNotBeAbleToPrepayTheNotesOrCreditFacilitiesUponAChangeInControlMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_WeMayNotBeAbleToPrepayTheNotesOrCreditFacilitiesUponAChangeInControlMember" xlink:to="lab_htgc_WeMayNotBeAbleToPrepayTheNotesOrCreditFacilitiesUponAChangeInControlMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_AccountsNotesAndLoansReceivableLineItems_9d89d283-a357-4c77-a33b-cdaca6314dfa_terseLabel_en-US" xlink:label="lab_us-gaap_AccountsNotesAndLoansReceivableLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accounts, Notes, Loans and Financing Receivable [Line Items]</link:label>
    <link:label id="lab_us-gaap_AccountsNotesAndLoansReceivableLineItems_label_en-US" xlink:label="lab_us-gaap_AccountsNotesAndLoansReceivableLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accounts, Notes, Loans and Financing Receivable [Line Items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccountsNotesAndLoansReceivableLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems" xlink:to="lab_us-gaap_AccountsNotesAndLoansReceivableLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage_d2178637-64c7-4cc2-8938-926985746049_verboseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Interest Rate</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage_08a7dc98-6c06-4637-8708-1872f9e22346_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Debt instrument, interest rate</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Debt Instrument, Interest Rate, Stated Percentage</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:to="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_DependingOnFundingRequirementsWeMayNeedToRaiseAdditionalCapitalToMeetOurUnfundedCommitmentsThroughAdditionalBorrowingsMember_label_en-US" xlink:label="lab_htgc_DependingOnFundingRequirementsWeMayNeedToRaiseAdditionalCapitalToMeetOurUnfundedCommitmentsThroughAdditionalBorrowingsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Depending on funding requirements, we may need to raise additional capital to meet our unfunded commitments through additional borrowings [Member]</link:label>
    <link:label id="lab_htgc_DependingOnFundingRequirementsWeMayNeedToRaiseAdditionalCapitalToMeetOurUnfundedCommitmentsThroughAdditionalBorrowingsMember_documentation_en-US" xlink:label="lab_htgc_DependingOnFundingRequirementsWeMayNeedToRaiseAdditionalCapitalToMeetOurUnfundedCommitmentsThroughAdditionalBorrowingsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Depending on funding requirements, we may need to raise additional capital to meet our unfunded commitments through additional borrowings [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_DependingOnFundingRequirementsWeMayNeedToRaiseAdditionalCapitalToMeetOurUnfundedCommitmentsThroughAdditionalBorrowingsMember" xlink:href="htgc-20231231.xsd#htgc_DependingOnFundingRequirementsWeMayNeedToRaiseAdditionalCapitalToMeetOurUnfundedCommitmentsThroughAdditionalBorrowingsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_DependingOnFundingRequirementsWeMayNeedToRaiseAdditionalCapitalToMeetOurUnfundedCommitmentsThroughAdditionalBorrowingsMember" xlink:to="lab_htgc_DependingOnFundingRequirementsWeMayNeedToRaiseAdditionalCapitalToMeetOurUnfundedCommitmentsThroughAdditionalBorrowingsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_StatementOfFinancialPositionAbstract_230f8321-0e60-41d8-b76b-d03d89bd02f4_terseLabel_en-US" xlink:label="lab_us-gaap_StatementOfFinancialPositionAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Statement of Financial Position [Abstract]</link:label>
    <link:label id="lab_us-gaap_StatementOfFinancialPositionAbstract_label_en-US" xlink:label="lab_us-gaap_StatementOfFinancialPositionAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Statement of Financial Position [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementOfFinancialPositionAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementOfFinancialPositionAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StatementOfFinancialPositionAbstract" xlink:to="lab_us-gaap_StatementOfFinancialPositionAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_WeMayExposeOurselvesToRisksIfWeEngageInHedgingTransactionsMember_label_en-US" xlink:label="lab_htgc_WeMayExposeOurselvesToRisksIfWeEngageInHedgingTransactionsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">We may expose ourselves to risks if we engage in hedging transactions [Member]</link:label>
    <link:label id="lab_htgc_WeMayExposeOurselvesToRisksIfWeEngageInHedgingTransactionsMember_documentation_en-US" xlink:label="lab_htgc_WeMayExposeOurselvesToRisksIfWeEngageInHedgingTransactionsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">We may expose ourselves to risks if we engage in hedging transactions [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_WeMayExposeOurselvesToRisksIfWeEngageInHedgingTransactionsMember" xlink:href="htgc-20231231.xsd#htgc_WeMayExposeOurselvesToRisksIfWeEngageInHedgingTransactionsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_WeMayExposeOurselvesToRisksIfWeEngageInHedgingTransactionsMember" xlink:to="lab_htgc_WeMayExposeOurselvesToRisksIfWeEngageInHedgingTransactionsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_StockholdersEquity_746a99d6-24e9-41b7-a9b9-ff2eeda22131_totalLabel_en-US" xlink:label="lab_us-gaap_StockholdersEquity" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total net assets</link:label>
    <link:label id="lab_us-gaap_StockholdersEquity_d8a000d9-6b42-4d2e-8214-2030f781850c_periodStartLabel_en-US" xlink:label="lab_us-gaap_StockholdersEquity" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Beginning balance</link:label>
    <link:label id="lab_us-gaap_StockholdersEquity_8200fee5-fd7a-4fd1-812a-242539189afc_periodEndLabel_en-US" xlink:label="lab_us-gaap_StockholdersEquity" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Ending balance</link:label>
    <link:label id="lab_us-gaap_StockholdersEquity_3bfabce1-9ab9-496d-9d44-01b846fd4df9_terseLabel_en-US" xlink:label="lab_us-gaap_StockholdersEquity" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Net assets at end of period</link:label>
    <link:label id="lab_us-gaap_StockholdersEquity_label_en-US" xlink:label="lab_us-gaap_StockholdersEquity" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Equity, Attributable to Parent</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockholdersEquity"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StockholdersEquity" xlink:to="lab_us-gaap_StockholdersEquity" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_AxsomeTherapeuticsIncMember_79c9fd68-20ea-4a57-8324-ec834e84cd09_terseLabel_en-US" xlink:label="lab_htgc_AxsomeTherapeuticsIncMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Axsome Therapeutics, Inc.</link:label>
    <link:label id="lab_htgc_AxsomeTherapeuticsIncMember_label_en-US" xlink:label="lab_htgc_AxsomeTherapeuticsIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Axsome Therapeutics Inc [Member]</link:label>
    <link:label id="lab_htgc_AxsomeTherapeuticsIncMember_documentation_en-US" xlink:label="lab_htgc_AxsomeTherapeuticsIncMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Axsome Therapeutics, Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_AxsomeTherapeuticsIncMember" xlink:href="htgc-20231231.xsd#htgc_AxsomeTherapeuticsIncMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_AxsomeTherapeuticsIncMember" xlink:to="lab_htgc_AxsomeTherapeuticsIncMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DebtInstrumentCollateral_7bcf5c86-3794-4f27-af57-b8a33d313240_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentCollateral" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Debt instrument, collateral</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentCollateral_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentCollateral" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Debt Instrument, Collateral</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCollateral" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentCollateral"/>
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    <link:label id="lab_htgc_TwoThousandThirtyThreeNotesMember_4fd432fe-0491-4803-8070-c360ed45e8dd_terseLabel_en-US" xlink:label="lab_htgc_TwoThousandThirtyThreeNotesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">2033 Notes</link:label>
    <link:label id="lab_htgc_TwoThousandThirtyThreeNotesMember_label_en-US" xlink:label="lab_htgc_TwoThousandThirtyThreeNotesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Two Thousand Thirty Three Notes [Member]</link:label>
    <link:label id="lab_htgc_TwoThousandThirtyThreeNotesMember_documentation_en-US" xlink:label="lab_htgc_TwoThousandThirtyThreeNotesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Two thousand thirty three notes.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_TwoThousandThirtyThreeNotesMember" xlink:href="htgc-20231231.xsd#htgc_TwoThousandThirtyThreeNotesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_TwoThousandThirtyThreeNotesMember" xlink:to="lab_htgc_TwoThousandThirtyThreeNotesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_OperatingLeaseRightOfUseAsset_81f203e3-911a-492c-94b8-23172dbd0372_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseRightOfUseAsset" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Right of use asset</link:label>
    <link:label id="lab_us-gaap_OperatingLeaseRightOfUseAsset_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseRightOfUseAsset" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Operating Lease, Right-of-Use Asset</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeaseRightOfUseAsset" xlink:to="lab_us-gaap_OperatingLeaseRightOfUseAsset" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DebtInstrumentTable_5f3ab24c-4f63-4e60-9b4c-44c1b35c7e9e_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Debt Instrument [Table]</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentTable_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Long-Term Debt Instruments [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentTable" xlink:to="lab_us-gaap_DebtInstrumentTable" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_UndistributedEarnings_735e41c3-8cc5-4fbc-bbfd-ba0bc9315434_verboseLabel_en-US" xlink:label="lab_us-gaap_UndistributedEarnings" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Earnings, net of distributions attributable to common shares</link:label>
    <link:label id="lab_us-gaap_UndistributedEarnings_label_en-US" xlink:label="lab_us-gaap_UndistributedEarnings" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Undistributed Earnings, Basic</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UndistributedEarnings" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_UndistributedEarnings"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_UndistributedEarnings" xlink:to="lab_us-gaap_UndistributedEarnings" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_43ee9e5b-9c4a-4521-9fa1-9a81ad8f54fd_totalLabel_en-US" xlink:label="lab_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Numerator for diluted change in net assets per common share</link:label>
    <link:label id="lab_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_label_en-US" xlink:label="lab_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Net Income (Loss) Available to Common Stockholders, Diluted</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted" xlink:to="lab_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_ValuationTechniqueOtherMember_2c85eeaf-543c-445f-b4ac-c9342622a6f0_terseLabel_en-US" xlink:label="lab_htgc_ValuationTechniqueOtherMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other</link:label>
    <link:label id="lab_htgc_ValuationTechniqueOtherMember_label_en-US" xlink:label="lab_htgc_ValuationTechniqueOtherMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Valuation Technique Other [Member]</link:label>
    <link:label id="lab_htgc_ValuationTechniqueOtherMember_documentation_en-US" xlink:label="lab_htgc_ValuationTechniqueOtherMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Valuation technique other.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_ValuationTechniqueOtherMember" xlink:href="htgc-20231231.xsd#htgc_ValuationTechniqueOtherMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_ValuationTechniqueOtherMember" xlink:to="lab_htgc_ValuationTechniqueOtherMember" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_RemainingMaxAwardValue_7c4f95e6-9173-422e-af60-e56a91548710_terseLabel_en-US" xlink:label="lab_htgc_RemainingMaxAwardValue" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Remaining max award value</link:label>
    <link:label id="lab_htgc_RemainingMaxAwardValue_label_en-US" xlink:label="lab_htgc_RemainingMaxAwardValue" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Remaining Max Award Value</link:label>
    <link:label id="lab_htgc_RemainingMaxAwardValue_documentation_en-US" xlink:label="lab_htgc_RemainingMaxAwardValue" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Remaining max award value</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_RemainingMaxAwardValue" xlink:href="htgc-20231231.xsd#htgc_RemainingMaxAwardValue"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_RemainingMaxAwardValue" xlink:to="lab_htgc_RemainingMaxAwardValue" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityAddressCityOrTown_c6cf97ce-4cfa-4bb7-9c87-71a00290f95c_terseLabel_en-US" xlink:label="lab_dei_EntityAddressCityOrTown" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" 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/2023/dei-2023.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_htgc_OurBusinessModelDependsToASignificantExtentUponStrongReferralRelationshipsMember_label_en-US" xlink:label="lab_htgc_OurBusinessModelDependsToASignificantExtentUponStrongReferralRelationshipsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Our business model depends to a significant extent upon strong referral relationships [Member]</link:label>
    <link:label id="lab_htgc_OurBusinessModelDependsToASignificantExtentUponStrongReferralRelationshipsMember_documentation_en-US" xlink:label="lab_htgc_OurBusinessModelDependsToASignificantExtentUponStrongReferralRelationshipsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Our business model depends to a significant extent upon strong referral relationships [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_OurBusinessModelDependsToASignificantExtentUponStrongReferralRelationshipsMember" xlink:href="htgc-20231231.xsd#htgc_OurBusinessModelDependsToASignificantExtentUponStrongReferralRelationshipsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_OurBusinessModelDependsToASignificantExtentUponStrongReferralRelationshipsMember" xlink:to="lab_htgc_OurBusinessModelDependsToASignificantExtentUponStrongReferralRelationshipsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_DronedeployIncMember_4415601f-10ec-45fb-9a16-29a2a7351fec_terseLabel_en-US" xlink:label="lab_htgc_DronedeployIncMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Dronedeploy, Inc.</link:label>
    <link:label id="lab_htgc_DronedeployIncMember_label_en-US" xlink:label="lab_htgc_DronedeployIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Dronedeploy, Inc. [Member]</link:label>
    <link:label id="lab_htgc_DronedeployIncMember_documentation_en-US" xlink:label="lab_htgc_DronedeployIncMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Dronedeploy, Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_DronedeployIncMember" xlink:href="htgc-20231231.xsd#htgc_DronedeployIncMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_DronedeployIncMember" xlink:to="lab_htgc_DronedeployIncMember" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_AlchemerLLCMember_c9290736-d969-4d50-9dfa-a75299a78088_terseLabel_en-US" xlink:label="lab_htgc_AlchemerLLCMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Alchemer LLC</link:label>
    <link:label id="lab_htgc_AlchemerLLCMember_label_en-US" xlink:label="lab_htgc_AlchemerLLCMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Alchemer L L C [Member]</link:label>
    <link:label id="lab_htgc_AlchemerLLCMember_documentation_en-US" xlink:label="lab_htgc_AlchemerLLCMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Alchemer LLC.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_AlchemerLLCMember" xlink:href="htgc-20231231.xsd#htgc_AlchemerLLCMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_AlchemerLLCMember" xlink:to="lab_htgc_AlchemerLLCMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_FairValueOfFinancialInstrumentsPolicy_181d1316-8b0d-4b64-9d99-884f3055848b_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueOfFinancialInstrumentsPolicy" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Valuation of Investments</link:label>
    <link:label id="lab_us-gaap_FairValueOfFinancialInstrumentsPolicy_label_en-US" xlink:label="lab_us-gaap_FairValueOfFinancialInstrumentsPolicy" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Fair Value of Financial Instruments, Policy [Policy Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueOfFinancialInstrumentsPolicy" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueOfFinancialInstrumentsPolicy"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueOfFinancialInstrumentsPolicy" xlink:to="lab_us-gaap_FairValueOfFinancialInstrumentsPolicy" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_DirectorPlanMember_1bcc1ac0-974d-4eee-ae1a-5d32e5765510_terseLabel_en-US" xlink:label="lab_htgc_DirectorPlanMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Director Plan</link:label>
    <link:label id="lab_htgc_DirectorPlanMember_label_en-US" xlink:label="lab_htgc_DirectorPlanMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Director Plan [Member]</link:label>
    <link:label id="lab_htgc_DirectorPlanMember_documentation_en-US" xlink:label="lab_htgc_DirectorPlanMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Director Plan</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_DirectorPlanMember" xlink:href="htgc-20231231.xsd#htgc_DirectorPlanMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_DirectorPlanMember" xlink:to="lab_htgc_DirectorPlanMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_CommonStockSharesAuthorized_b77e1d4a-13f6-479e-8683-0a4befabc41f_terseLabel_en-US" xlink:label="lab_us-gaap_CommonStockSharesAuthorized" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Common stock authorized (in shares)</link:label>
    <link:label id="lab_us-gaap_CommonStockSharesAuthorized_label_en-US" xlink:label="lab_us-gaap_CommonStockSharesAuthorized" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Common Stock, Shares Authorized</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesAuthorized" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockSharesAuthorized"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CommonStockSharesAuthorized" xlink:to="lab_us-gaap_CommonStockSharesAuthorized" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ScheduleOfInvestmentsAbstract_84772b75-47f7-4b43-87c9-672e11576bf6_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfInvestmentsAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Investments [Abstract]</link:label>
    <link:label id="lab_us-gaap_ScheduleOfInvestmentsAbstract_label_en-US" xlink:label="lab_us-gaap_ScheduleOfInvestmentsAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Investments [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentsAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfInvestmentsAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfInvestmentsAbstract" xlink:to="lab_us-gaap_ScheduleOfInvestmentsAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_DocumentInformationTable_653f3b5b-ea2b-4d76-ae42-0e27e9482d02_terseLabel_en-US" xlink:label="lab_dei_DocumentInformationTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" 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/2023/dei-2023.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_htgc_TaxableIncomePerShare_f316ac55-8637-41cb-a451-4b7e16cf628c_terseLabel_en-US" xlink:label="lab_htgc_TaxableIncomePerShare" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Taxable income, per share (in dollars per share)</link:label>
    <link:label id="lab_htgc_TaxableIncomePerShare_label_en-US" xlink:label="lab_htgc_TaxableIncomePerShare" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Taxable Income Per Share</link:label>
    <link:label id="lab_htgc_TaxableIncomePerShare_documentation_en-US" xlink:label="lab_htgc_TaxableIncomePerShare" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Taxable income per share.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_TaxableIncomePerShare" xlink:href="htgc-20231231.xsd#htgc_TaxableIncomePerShare"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_TaxableIncomePerShare" xlink:to="lab_htgc_TaxableIncomePerShare" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_SummaryOfInvestmentHoldingsLineItems_8af76d77-c149-4abe-afd9-eaf714eb4618_terseLabel_en-US" xlink:label="lab_us-gaap_SummaryOfInvestmentHoldingsLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Summary of Investment Holdings</link:label>
    <link:label id="lab_us-gaap_SummaryOfInvestmentHoldingsLineItems_label_en-US" xlink:label="lab_us-gaap_SummaryOfInvestmentHoldingsLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Summary of Investment Holdings [Line Items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SummaryOfInvestmentHoldingsLineItems" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SummaryOfInvestmentHoldingsLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SummaryOfInvestmentHoldingsLineItems" xlink:to="lab_us-gaap_SummaryOfInvestmentHoldingsLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LineOfCreditFacilityLenderDomain_e50e0ae3-a15f-40e2-aae8-b1c9dea695b7_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityLenderDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Line of Credit Facility, Lender</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLenderDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LineOfCreditFacilityLenderDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditFacilityLenderDomain" xlink:to="lab_us-gaap_LineOfCreditFacilityLenderDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_IndemnificationDisclosureTextBlock_9442b169-35e3-41d3-8404-ccf9e797334b_terseLabel_en-US" xlink:label="lab_htgc_IndemnificationDisclosureTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Indemnification</link:label>
    <link:label id="lab_htgc_IndemnificationDisclosureTextBlock_label_en-US" xlink:label="lab_htgc_IndemnificationDisclosureTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Indemnification Disclosure [Text Block]</link:label>
    <link:label id="lab_htgc_IndemnificationDisclosureTextBlock_documentation_en-US" xlink:label="lab_htgc_IndemnificationDisclosureTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Indemnification Disclosure [Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_IndemnificationDisclosureTextBlock" xlink:href="htgc-20231231.xsd#htgc_IndemnificationDisclosureTextBlock"/>
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    <link:label id="lab_us-gaap_TaxBasisOfInvestmentsUnrealizedAppreciationDepreciationNet_0ce64d82-d2f9-4fe8-ae65-ccdf8368da99_terseLabel_en-US" xlink:label="lab_us-gaap_TaxBasisOfInvestmentsUnrealizedAppreciationDepreciationNet" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Tax basis of investments, unrealized appreciation (depreciation), net</link:label>
    <link:label id="lab_us-gaap_TaxBasisOfInvestmentsUnrealizedAppreciationDepreciationNet_label_en-US" xlink:label="lab_us-gaap_TaxBasisOfInvestmentsUnrealizedAppreciationDepreciationNet" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investment, Tax Basis, Unrealized Gain (Loss)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxBasisOfInvestmentsUnrealizedAppreciationDepreciationNet" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TaxBasisOfInvestmentsUnrealizedAppreciationDepreciationNet"/>
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    <link:label id="lab_us-gaap_OtherAssetsFairValueDisclosure_3e9664d1-c0e9-4e9c-9f30-1d3a373f2365_terseLabel_en-US" xlink:label="lab_us-gaap_OtherAssetsFairValueDisclosure" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other assets</link:label>
    <link:label id="lab_us-gaap_OtherAssetsFairValueDisclosure_label_en-US" xlink:label="lab_us-gaap_OtherAssetsFairValueDisclosure" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other Assets, Fair Value Disclosure</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsFairValueDisclosure" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherAssetsFairValueDisclosure"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherAssetsFairValueDisclosure" xlink:to="lab_us-gaap_OtherAssetsFairValueDisclosure" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_OneMonthSecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember_811b73b6-6249-489b-a60c-0ce182412099_terseLabel_en-US" xlink:label="lab_htgc_OneMonthSecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">1-month SOFR</link:label>
    <link:label id="lab_htgc_OneMonthSecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember_label_en-US" xlink:label="lab_htgc_OneMonthSecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">One Month Secured Overnight Financing Rate Sofr Overnight Index Swap Rate [Member]</link:label>
    <link:label id="lab_htgc_OneMonthSecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember_documentation_en-US" xlink:label="lab_htgc_OneMonthSecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">One month secured overnight financing rate sofr overnight index swap rate member.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_OneMonthSecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember" xlink:href="htgc-20231231.xsd#htgc_OneMonthSecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_OneMonthSecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember" xlink:to="lab_htgc_OneMonthSecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_AllAssetsWithNegativePledgeOnIntellectualPropertyMember_80c6b28b-4344-499a-9def-2438540fc67c_terseLabel_en-US" xlink:label="lab_htgc_AllAssetsWithNegativePledgeOnIntellectualPropertyMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">All assets with negative pledge on intellectual property</link:label>
    <link:label id="lab_htgc_AllAssetsWithNegativePledgeOnIntellectualPropertyMember_label_en-US" xlink:label="lab_htgc_AllAssetsWithNegativePledgeOnIntellectualPropertyMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">All Assets with Negative Pledge on Intellectual Property [Member]</link:label>
    <link:label id="lab_htgc_AllAssetsWithNegativePledgeOnIntellectualPropertyMember_documentation_en-US" xlink:label="lab_htgc_AllAssetsWithNegativePledgeOnIntellectualPropertyMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">All Assets with Negative Pledge on Intellectual Property [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_AllAssetsWithNegativePledgeOnIntellectualPropertyMember" xlink:href="htgc-20231231.xsd#htgc_AllAssetsWithNegativePledgeOnIntellectualPropertyMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_AllAssetsWithNegativePledgeOnIntellectualPropertyMember" xlink:to="lab_htgc_AllAssetsWithNegativePledgeOnIntellectualPropertyMember" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_CerosIncMember_8dd18812-fd60-47a0-a4d3-557dc3995fd0_terseLabel_en-US" xlink:label="lab_htgc_CerosIncMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Ceros, Inc.</link:label>
    <link:label id="lab_htgc_CerosIncMember_label_en-US" xlink:label="lab_htgc_CerosIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Ceros, Inc. [Member]</link:label>
    <link:label id="lab_htgc_CerosIncMember_documentation_en-US" xlink:label="lab_htgc_CerosIncMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Ceros, Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_CerosIncMember" xlink:href="htgc-20231231.xsd#htgc_CerosIncMember"/>
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    <link:label id="lab_htgc_TarsusPharmaceuticalsIncMember_2c9bdeba-ffe2-4ee4-86be-2a83a778a4d3_terseLabel_en-US" xlink:label="lab_htgc_TarsusPharmaceuticalsIncMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Tarsus Pharmaceuticals, Inc.</link:label>
    <link:label id="lab_htgc_TarsusPharmaceuticalsIncMember_label_en-US" xlink:label="lab_htgc_TarsusPharmaceuticalsIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Tarsus Pharmaceuticals Inc [Member]</link:label>
    <link:label id="lab_htgc_TarsusPharmaceuticalsIncMember_documentation_en-US" xlink:label="lab_htgc_TarsusPharmaceuticalsIncMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Tarsus Pharmaceuticals, Inc.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_TarsusPharmaceuticalsIncMember" xlink:href="htgc-20231231.xsd#htgc_TarsusPharmaceuticalsIncMember"/>
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    <link:label id="lab_htgc_PRIMEInterestRateMember_aaf23698-51c9-43b2-bc6a-86786ab1b3f1_terseLabel_en-US" xlink:label="lab_htgc_PRIMEInterestRateMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">PRIME</link:label>
    <link:label id="lab_htgc_PRIMEInterestRateMember_label_en-US" xlink:label="lab_htgc_PRIMEInterestRateMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">P R I M E Interest Rate [Member]</link:label>
    <link:label id="lab_htgc_PRIMEInterestRateMember_documentation_en-US" xlink:label="lab_htgc_PRIMEInterestRateMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">PRIME Interest Rate.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_PRIMEInterestRateMember" xlink:href="htgc-20231231.xsd#htgc_PRIMEInterestRateMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_PRIMEInterestRateMember" xlink:to="lab_htgc_PRIMEInterestRateMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_dc05414e-70f4-416b-8ffd-df6dba9c6852_terseLabel_en-US" xlink:label="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Adjustments to reconcile net increase in net assets resulting from operations to net cash provided by (used in) operating activities:</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract"/>
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    <link:label id="lab_us-gaap_RelatedPartyTransactionsAbstract_b5d0a5c4-60b5-4336-9c21-9d9a575cbcf2_terseLabel_en-US" xlink:label="lab_us-gaap_RelatedPartyTransactionsAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Related Party Transactions [Abstract]</link:label>
    <link:label id="lab_us-gaap_RelatedPartyTransactionsAbstract_label_en-US" xlink:label="lab_us-gaap_RelatedPartyTransactionsAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Related Party Transactions [Abstract]</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RelatedPartyTransactionsAbstract" xlink:to="lab_us-gaap_RelatedPartyTransactionsAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_MeasurementInputTypeAxis_da634b70-1595-40a4-a67c-f31eb8d837d0_terseLabel_en-US" xlink:label="lab_us-gaap_MeasurementInputTypeAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Measurement Input Type</link:label>
    <link:label id="lab_us-gaap_MeasurementInputTypeAxis_label_en-US" xlink:label="lab_us-gaap_MeasurementInputTypeAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Measurement Input Type [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_MeasurementInputTypeAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_MeasurementInputTypeAxis" xlink:to="lab_us-gaap_MeasurementInputTypeAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_PaymentOfFeesForCreditFacilitiesAndDebentures_47044be9-9bd6-46b2-af07-686c7bd0bace_negatedLabel_en-US" xlink:label="lab_htgc_PaymentOfFeesForCreditFacilitiesAndDebentures" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Fees paid for credit facilities and debentures</link:label>
    <link:label id="lab_htgc_PaymentOfFeesForCreditFacilitiesAndDebentures_label_en-US" xlink:label="lab_htgc_PaymentOfFeesForCreditFacilitiesAndDebentures" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Payment Of Fees For Credit Facilities And Debentures</link:label>
    <link:label id="lab_htgc_PaymentOfFeesForCreditFacilitiesAndDebentures_documentation_en-US" xlink:label="lab_htgc_PaymentOfFeesForCreditFacilitiesAndDebentures" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Payment of fees for credit facilities and debentures.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_PaymentOfFeesForCreditFacilitiesAndDebentures" xlink:href="htgc-20231231.xsd#htgc_PaymentOfFeesForCreditFacilitiesAndDebentures"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_PaymentOfFeesForCreditFacilitiesAndDebentures" xlink:to="lab_htgc_PaymentOfFeesForCreditFacilitiesAndDebentures" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_KhorosPkaLithiumTechnologiesMember_1436dc2d-a096-49dc-9a27-14c9a9db17d1_terseLabel_en-US" xlink:label="lab_htgc_KhorosPkaLithiumTechnologiesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Khoros (p.k.a Lithium Technologies)</link:label>
    <link:label id="lab_htgc_KhorosPkaLithiumTechnologiesMember_label_en-US" xlink:label="lab_htgc_KhorosPkaLithiumTechnologiesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Khoros (p.k.a Lithium Technologies) [Member]</link:label>
    <link:label id="lab_htgc_KhorosPkaLithiumTechnologiesMember_documentation_en-US" xlink:label="lab_htgc_KhorosPkaLithiumTechnologiesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Khoros (p.k.a Lithium Technologies)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_KhorosPkaLithiumTechnologiesMember" xlink:href="htgc-20231231.xsd#htgc_KhorosPkaLithiumTechnologiesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_KhorosPkaLithiumTechnologiesMember" xlink:to="lab_htgc_KhorosPkaLithiumTechnologiesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_InvestmentHoldingsScheduleOfInvestmentsTableTextBlock_89eea27c-8c06-43c5-9451-6a03c9d6aad5_terseLabel_en-US" xlink:label="lab_us-gaap_InvestmentHoldingsScheduleOfInvestmentsTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Investments Portfolio</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InvestmentHoldingsScheduleOfInvestmentsTableTextBlock" xlink:to="lab_us-gaap_InvestmentHoldingsScheduleOfInvestmentsTableTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_UnfundedCommitmentsDueInThirdYear_91b7a992-29a9-4f7c-8123-2cf4014907f1_terseLabel_en-US" xlink:label="lab_htgc_UnfundedCommitmentsDueInThirdYear" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">2026</link:label>
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    <link:label id="lab_us-gaap_AdditionalPaidInCapital_7224f905-501a-41de-b442-ba7b1d53a98a_terseLabel_en-US" xlink:label="lab_us-gaap_AdditionalPaidInCapital" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Capital in excess of par value</link:label>
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    <link:label id="lab_htgc_SBADebenturesIssuedOnNovemberFifteenTwoThousandAndTwentyOneMember_documentation_en-US" xlink:label="lab_htgc_SBADebenturesIssuedOnNovemberFifteenTwoThousandAndTwentyOneMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">SBA debentures issued on november fifteen, two thousand and twenty one.</link:label>
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    <link:label id="lab_htgc_SBADebenturesIssuedOnAugustTwentyTwoThousandAndTwentyOneMember_documentation_en-US" xlink:label="lab_htgc_SBADebenturesIssuedOnAugustTwentyTwoThousandAndTwentyOneMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">SBA debentures issued on august twenty, two thousand and twenty one.</link:label>
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    <link:label id="lab_us-gaap_IncomeTaxPolicyTextBlock_65fb97ea-8b7f-4b68-92a6-aa980aff23af_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxPolicyTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Income Taxes</link:label>
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    <link:label id="lab_htgc_TheRespectiveIndenturesUnderWhichTheNotesWereIssuedContainLimitedProtectionsForTheHoldersOfTheNotesMember_documentation_en-US" xlink:label="lab_htgc_TheRespectiveIndenturesUnderWhichTheNotesWereIssuedContainLimitedProtectionsForTheHoldersOfTheNotesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">The respective indentures under which the notes were issued contain limited protections for the holders of the notes.</link:label>
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    <link:label id="lab_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_0e9b867c-4ea7-4c86-82a6-1265bade85a2_terseLabel_en-US" xlink:label="lab_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Related Party</link:label>
    <link:label id="lab_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_label_en-US" xlink:label="lab_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Related Party, Type [Axis]</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:to="lab_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_SBADebenturesIssuedOnOctoberTwentyOneTwoThousandAndTwentyOneMember_25fd478d-72ec-444d-a0d1-139df50e8348_terseLabel_en-US" xlink:label="lab_htgc_SBADebenturesIssuedOnOctoberTwentyOneTwoThousandAndTwentyOneMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">SBA Debentures Issued on October 21, 2021</link:label>
    <link:label id="lab_htgc_SBADebenturesIssuedOnOctoberTwentyOneTwoThousandAndTwentyOneMember_label_en-US" xlink:label="lab_htgc_SBADebenturesIssuedOnOctoberTwentyOneTwoThousandAndTwentyOneMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">S B A Debentures Issued On October Twenty One Two Thousand And Twenty One [Member]</link:label>
    <link:label id="lab_htgc_SBADebenturesIssuedOnOctoberTwentyOneTwoThousandAndTwentyOneMember_documentation_en-US" xlink:label="lab_htgc_SBADebenturesIssuedOnOctoberTwentyOneTwoThousandAndTwentyOneMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">SBA debentures issued on cctober twenty one, two thousand and twenty one.</link:label>
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    <link:label id="lab_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_096a0117-c440-4ed7-a71d-ce191222d380_terseLabel_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Issuance of common stock under equity-based award plans (in shares)</link:label>
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    <link:label id="lab_htgc_IncludedInCostMember_05810c9a-5f87-4b73-a2ca-68fcea37c2be_terseLabel_en-US" xlink:label="lab_htgc_IncludedInCostMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Offset against debt investment cost</link:label>
    <link:label id="lab_htgc_IncludedInCostMember_9038fa45-ff9c-45fd-9ce2-ca7e026d94a1_verboseLabel_en-US" xlink:label="lab_htgc_IncludedInCostMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Included within debt investment cost</link:label>
    <link:label id="lab_htgc_IncludedInCostMember_label_en-US" xlink:label="lab_htgc_IncludedInCostMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Included in Cost [Member]</link:label>
    <link:label id="lab_htgc_IncludedInCostMember_documentation_en-US" xlink:label="lab_htgc_IncludedInCostMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Included in Cost [Member]</link:label>
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    <link:label id="lab_htgc_AggregateUnrealizedAppreciationAndDepreciationOfInvestmentOverFederalIncomeTaxTableTextBlock_d668ec4c-e619-46e3-aafa-3d42f84df7f9_terseLabel_en-US" xlink:label="lab_htgc_AggregateUnrealizedAppreciationAndDepreciationOfInvestmentOverFederalIncomeTaxTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Aggregate Unrealized Appreciation And Depreciation of Investment Over Federal Income Tax</link:label>
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    <link:label id="lab_dei_EntityRegistrantName_300cc0a4-813c-4538-8a9e-d8c80cad78ac_terseLabel_en-US" xlink:label="lab_dei_EntityRegistrantName" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Registrant Name</link:label>
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    <link:label id="lab_us-gaap_IncreaseDecreaseInOtherOperatingAssets_9980a910-a1d7-4d62-97f2-2ccfe14c6bfd_negatedLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOtherOperatingAssets" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other assets</link:label>
    <link:label id="lab_us-gaap_IncreaseDecreaseInOtherOperatingAssets_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOtherOperatingAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Increase (Decrease) in Other Operating Assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncreaseDecreaseInOtherOperatingAssets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets" xlink:to="lab_us-gaap_IncreaseDecreaseInOtherOperatingAssets" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ContractualObligationDueInFourthAndFifthYear_b71139e4-73b0-423f-bedb-6306eccc76e9_terseLabel_en-US" xlink:label="lab_us-gaap_ContractualObligationDueInFourthAndFifthYear" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Contractual Obligations 3-5 years</link:label>
    <link:label id="lab_us-gaap_ContractualObligationDueInFourthAndFifthYear_label_en-US" xlink:label="lab_us-gaap_ContractualObligationDueInFourthAndFifthYear" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Contractual Obligation, to be Paid, Year Four and Five</link:label>
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    <link:label id="lab_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_752cef44-6224-46e0-8012-6be52ff79495_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationAwardTrancheTwoMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share-Based Payment Arrangement, Tranche Two</link:label>
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    <link:label id="lab_htgc_ScheduleOfReclassifiedAccumulatedRealizedGainLossToAdditionalPaidInCapitalTableTextBlock_d18ccb0d-7fd1-4e5d-9ca2-f49e025b441d_terseLabel_en-US" xlink:label="lab_htgc_ScheduleOfReclassifiedAccumulatedRealizedGainLossToAdditionalPaidInCapitalTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Reclassified Accumulated Realized Gain (loss) to Additional Paid-in Capital</link:label>
    <link:label id="lab_htgc_ScheduleOfReclassifiedAccumulatedRealizedGainLossToAdditionalPaidInCapitalTableTextBlock_label_en-US" xlink:label="lab_htgc_ScheduleOfReclassifiedAccumulatedRealizedGainLossToAdditionalPaidInCapitalTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule Of Reclassified Accumulated Realized Gain (Loss) To Additional Paid-in Capital [Table Text Block]</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_htgc_ScheduleOfReclassifiedAccumulatedRealizedGainLossToAdditionalPaidInCapitalTableTextBlock" xlink:href="htgc-20231231.xsd#htgc_ScheduleOfReclassifiedAccumulatedRealizedGainLossToAdditionalPaidInCapitalTableTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_ScheduleOfReclassifiedAccumulatedRealizedGainLossToAdditionalPaidInCapitalTableTextBlock" xlink:to="lab_htgc_ScheduleOfReclassifiedAccumulatedRealizedGainLossToAdditionalPaidInCapitalTableTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_InvestmentIssuerAffiliationAxis_c261f392-3f1e-4a0e-819f-057366727071_terseLabel_en-US" xlink:label="lab_us-gaap_InvestmentIssuerAffiliationAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investment, Issuer Affiliation [Axis]</link:label>
    <link:label id="lab_us-gaap_InvestmentIssuerAffiliationAxis_label_en-US" xlink:label="lab_us-gaap_InvestmentIssuerAffiliationAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investment, Issuer Affiliation [Axis]</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InvestmentIssuerAffiliationAxis" xlink:to="lab_us-gaap_InvestmentIssuerAffiliationAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_AuditorName_d7b2cb95-e73c-4abf-9c1c-005f0b29e2c1_terseLabel_en-US" xlink:label="lab_dei_AuditorName" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" 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/2023/dei-2023.xsd#dei_AuditorName"/>
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    <link:label id="lab_htgc_WeightedAveragePerformanceConditionsInLiability_4654cda8-bfb8-4ff5-958f-002630d636a1_terseLabel_en-US" xlink:label="lab_htgc_WeightedAveragePerformanceConditionsInLiability" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted average performance conditions in liability</link:label>
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    <link:label id="lab_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures_955af8d2-dfbd-45a1-8bcd-15131284ee39_terseLabel_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Issuance of common stock under equity-based award plans</link:label>
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    <link:label id="lab_dei_EntityCentralIndexKey_658236f0-f659-4896-aa05-c826ae5a1372_terseLabel_en-US" xlink:label="lab_dei_EntityCentralIndexKey" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Central Index Key</link:label>
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    <link:label id="lab_us-gaap_AmortizationOfFinancingCostsAndDiscounts_51fffd40-1768-4fd6-a1f4-71ac1679ea65_terseLabel_en-US" xlink:label="lab_us-gaap_AmortizationOfFinancingCostsAndDiscounts" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Amortization of debt fees and issuance costs</link:label>
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    <link:label id="lab_htgc_OurWhollyOwnedSubsidiaryIsLicensedByTheSbaAndThereforeSubjectToSbicRegulationsMember_label_en-US" xlink:label="lab_htgc_OurWhollyOwnedSubsidiaryIsLicensedByTheSbaAndThereforeSubjectToSbicRegulationsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Our Wholly Owned Subsidiary Is Licensed By The SBA, And Therefore Subject To SBIC Regulations [Member]</link:label>
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    <link:label id="lab_us-gaap_DividendPayableDateToBePaidDayMonthAndYear_a7314c66-3649-4c56-8159-c398d46d462d_verboseLabel_en-US" xlink:label="lab_us-gaap_DividendPayableDateToBePaidDayMonthAndYear" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Payment Date</link:label>
    <link:label id="lab_us-gaap_DividendPayableDateToBePaidDayMonthAndYear_label_en-US" xlink:label="lab_us-gaap_DividendPayableDateToBePaidDayMonthAndYear" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Dividends Payable, Date to be Paid</link:label>
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    <link:label id="lab_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1_7dde51ee-23f9-47da-a025-6cdbdfe018df_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Net Realized Gains (Losses)</link:label>
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    <link:label id="lab_us-gaap_AllocatedShareBasedCompensationExpense_49d29aec-a44a-4ae5-bbe6-902cf3856015_terseLabel_en-US" xlink:label="lab_us-gaap_AllocatedShareBasedCompensationExpense" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Stock-based compensation</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_htgc_FailureToComplyWithApplicableLawsOrRegulationsAndChangesInLawsOrRegulationsGoverningOurOperationsMayAdverselyAffectOurBusinessOrCauseUsToAlterOurBusinessStrategyMember" xlink:href="htgc-20231231.xsd#htgc_FailureToComplyWithApplicableLawsOrRegulationsAndChangesInLawsOrRegulationsGoverningOurOperationsMayAdverselyAffectOurBusinessOrCauseUsToAlterOurBusinessStrategyMember"/>
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    <link:label id="lab_htgc_ShareBasedCompensationArrangementByShareBasedPaymentAwardDisposalPeriodAfterVesting_28767b1d-2a18-4e32-847b-cb1de2d4f420_terseLabel_en-US" xlink:label="lab_htgc_ShareBasedCompensationArrangementByShareBasedPaymentAwardDisposalPeriodAfterVesting" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disposal period after vesting</link:label>
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    <link:label id="lab_us-gaap_IncomeStatementCompensationItemsAbstract_d4f9d991-3e1e-45f7-9652-3a3018a2f210_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeStatementCompensationItemsAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Employee compensation:</link:label>
    <link:label id="lab_us-gaap_IncomeStatementCompensationItemsAbstract_label_en-US" xlink:label="lab_us-gaap_IncomeStatementCompensationItemsAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Compensation Items [Abstract]</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeStatementCompensationItemsAbstract" xlink:to="lab_us-gaap_IncomeStatementCompensationItemsAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_StockIssuedDuringPeriodValueNewIssues_1e5889fd-7133-4c66-b5b0-725abbf7b1ef_verboseLabel_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodValueNewIssues" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Public offering, net of offering expenses</link:label>
    <link:label id="lab_us-gaap_StockIssuedDuringPeriodValueNewIssues_label_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodValueNewIssues" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Stock Issued During Period, Value, New Issues</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodValueNewIssues"/>
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    <link:label id="lab_dei_EntityDomain_fd6afa4c-c094-41f0-8657-2d03c6e7f940_terseLabel_en-US" xlink:label="lab_dei_EntityDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity</link:label>
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    <link:label id="lab_us-gaap_LongtermDebtTypeAxis_50d3e81e-85f2-4bf0-8f26-7140e6e14a2c_terseLabel_en-US" xlink:label="lab_us-gaap_LongtermDebtTypeAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Long-Term Debt, Type</link:label>
    <link:label id="lab_us-gaap_LongtermDebtTypeAxis_label_en-US" xlink:label="lab_us-gaap_LongtermDebtTypeAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Long-Term Debt, Type [Axis]</link:label>
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    <link:label id="lab_dei_AmendmentFlag_aa8c0d39-1ef4-4918-a164-e6f0e98a3f0e_terseLabel_en-US" xlink:label="lab_dei_AmendmentFlag" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" 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/2023/dei-2023.xsd#dei_AmendmentFlag"/>
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    <link:label id="lab_htgc_FlightScheduleProLLCMember_8f38e164-23f7-46ba-b1c2-46b02112daa0_terseLabel_en-US" xlink:label="lab_htgc_FlightScheduleProLLCMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Flight Schedule Pro, LLC</link:label>
    <link:label id="lab_htgc_FlightScheduleProLLCMember_label_en-US" xlink:label="lab_htgc_FlightScheduleProLLCMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Flight Schedule Pro, LLC [Member]</link:label>
    <link:label id="lab_htgc_FlightScheduleProLLCMember_documentation_en-US" xlink:label="lab_htgc_FlightScheduleProLLCMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Flight Schedule Pro, LLC</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_FlightScheduleProLLCMember" xlink:href="htgc-20231231.xsd#htgc_FlightScheduleProLLCMember"/>
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    <link:label id="lab_htgc_DerivativeInstrumentMember_5af74142-db51-4a53-8d19-7c9d3fedabe8_verboseLabel_en-US" xlink:label="lab_htgc_DerivativeInstrumentMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Derivative Instruments</link:label>
    <link:label id="lab_htgc_DerivativeInstrumentMember_label_en-US" xlink:label="lab_htgc_DerivativeInstrumentMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Derivative Instrument [Member]</link:label>
    <link:label id="lab_htgc_DerivativeInstrumentMember_documentation_en-US" xlink:label="lab_htgc_DerivativeInstrumentMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Derivative Instrument [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_DerivativeInstrumentMember" xlink:href="htgc-20231231.xsd#htgc_DerivativeInstrumentMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_DerivativeInstrumentMember" xlink:to="lab_htgc_DerivativeInstrumentMember" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_WeAreSubjectToRisksAssociatedWithTheCurrentInterestRateEnvironmentAndChangesInInterestRatesWillAffectOurCostOfCapitalNetInvestmentIncomeAndTheValueOfOurInvestmentsMember_label_en-US" xlink:label="lab_htgc_WeAreSubjectToRisksAssociatedWithTheCurrentInterestRateEnvironmentAndChangesInInterestRatesWillAffectOurCostOfCapitalNetInvestmentIncomeAndTheValueOfOurInvestmentsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">We are subject to risks associated with the current interest rate environment and changes in interest rates will affect our cost of capital, net investment income and the value of our investments [Member]</link:label>
    <link:label id="lab_htgc_WeAreSubjectToRisksAssociatedWithTheCurrentInterestRateEnvironmentAndChangesInInterestRatesWillAffectOurCostOfCapitalNetInvestmentIncomeAndTheValueOfOurInvestmentsMember_documentation_en-US" xlink:label="lab_htgc_WeAreSubjectToRisksAssociatedWithTheCurrentInterestRateEnvironmentAndChangesInInterestRatesWillAffectOurCostOfCapitalNetInvestmentIncomeAndTheValueOfOurInvestmentsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">We are subject to risks associated with the current interest rate environment and changes in interest rates will affect our cost of capital, net investment income and the value of our investments [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_WeAreSubjectToRisksAssociatedWithTheCurrentInterestRateEnvironmentAndChangesInInterestRatesWillAffectOurCostOfCapitalNetInvestmentIncomeAndTheValueOfOurInvestmentsMember" xlink:href="htgc-20231231.xsd#htgc_WeAreSubjectToRisksAssociatedWithTheCurrentInterestRateEnvironmentAndChangesInInterestRatesWillAffectOurCostOfCapitalNetInvestmentIncomeAndTheValueOfOurInvestmentsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_WeAreSubjectToRisksAssociatedWithTheCurrentInterestRateEnvironmentAndChangesInInterestRatesWillAffectOurCostOfCapitalNetInvestmentIncomeAndTheValueOfOurInvestmentsMember" xlink:to="lab_htgc_WeAreSubjectToRisksAssociatedWithTheCurrentInterestRateEnvironmentAndChangesInInterestRatesWillAffectOurCostOfCapitalNetInvestmentIncomeAndTheValueOfOurInvestmentsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_AprilTwoThousandTwentyFiveNotesMember_f7a687de-6341-4b74-9c83-0d257d79cfc2_terseLabel_en-US" xlink:label="lab_htgc_AprilTwoThousandTwentyFiveNotesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">April 2025 Notes</link:label>
    <link:label id="lab_htgc_AprilTwoThousandTwentyFiveNotesMember_label_en-US" xlink:label="lab_htgc_AprilTwoThousandTwentyFiveNotesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">April Two Thousand Twenty Five Notes [Member]</link:label>
    <link:label id="lab_htgc_AprilTwoThousandTwentyFiveNotesMember_documentation_en-US" xlink:label="lab_htgc_AprilTwoThousandTwentyFiveNotesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">April two thousand twenty five notes.</link:label>
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    <link:label id="lab_us-gaap_OperatingExpensesAbstract_83d4a2c6-1507-4de2-9836-91971555d7af_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingExpensesAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Operating expenses:</link:label>
    <link:label id="lab_us-gaap_OperatingExpensesAbstract_label_en-US" xlink:label="lab_us-gaap_OperatingExpensesAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Operating Expenses [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpensesAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingExpensesAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingExpensesAbstract" xlink:to="lab_us-gaap_OperatingExpensesAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_DeferredFeesMember_3e8b9075-6e61-4864-8f04-302875005756_terseLabel_en-US" xlink:label="lab_htgc_DeferredFeesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Deferred obligation contingent on funding or other milestone</link:label>
    <link:label id="lab_htgc_DeferredFeesMember_75a35850-6678-4838-8568-acbdef868780_verboseLabel_en-US" xlink:label="lab_htgc_DeferredFeesMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Deferred receivable related to expired commitments</link:label>
    <link:label id="lab_htgc_DeferredFeesMember_label_en-US" xlink:label="lab_htgc_DeferredFeesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Deferred Fees [Member]</link:label>
    <link:label id="lab_htgc_DeferredFeesMember_documentation_en-US" xlink:label="lab_htgc_DeferredFeesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Deferred Fees [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_DeferredFeesMember" xlink:href="htgc-20231231.xsd#htgc_DeferredFeesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_DeferredFeesMember" xlink:to="lab_htgc_DeferredFeesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_NumberOfPubliclyTradedCompanies_4edf0556-6f4a-4ad1-909a-bfb5d9e85214_terseLabel_en-US" xlink:label="lab_htgc_NumberOfPubliclyTradedCompanies" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of publicly traded companies</link:label>
    <link:label id="lab_htgc_NumberOfPubliclyTradedCompanies_label_en-US" xlink:label="lab_htgc_NumberOfPubliclyTradedCompanies" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number Of Publicly Traded Companies</link:label>
    <link:label id="lab_htgc_NumberOfPubliclyTradedCompanies_documentation_en-US" xlink:label="lab_htgc_NumberOfPubliclyTradedCompanies" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of publicly traded companies.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_NumberOfPubliclyTradedCompanies" xlink:href="htgc-20231231.xsd#htgc_NumberOfPubliclyTradedCompanies"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_NumberOfPubliclyTradedCompanies" xlink:to="lab_htgc_NumberOfPubliclyTradedCompanies" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_LeaseAndLicenseObligationsMember_1d41c250-c7a9-4896-9096-42f458bda741_terseLabel_en-US" xlink:label="lab_htgc_LeaseAndLicenseObligationsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Lease and License Obligations</link:label>
    <link:label id="lab_htgc_LeaseAndLicenseObligationsMember_label_en-US" xlink:label="lab_htgc_LeaseAndLicenseObligationsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Lease And License Obligations [Member]</link:label>
    <link:label id="lab_htgc_LeaseAndLicenseObligationsMember_documentation_en-US" xlink:label="lab_htgc_LeaseAndLicenseObligationsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Lease and license obligations.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_LeaseAndLicenseObligationsMember" xlink:href="htgc-20231231.xsd#htgc_LeaseAndLicenseObligationsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_LeaseAndLicenseObligationsMember" xlink:to="lab_htgc_LeaseAndLicenseObligationsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_Assets_5ad3a8a7-5160-4b78-ad86-2881ac3e7de8_totalLabel_en-US" xlink:label="lab_us-gaap_Assets" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total assets</link:label>
    <link:label id="lab_us-gaap_Assets_label_en-US" xlink:label="lab_us-gaap_Assets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_Assets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_Assets" xlink:to="lab_us-gaap_Assets" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_CumulativeUnrealizedGainLossOnDerivatives_f7a9da6c-2919-4de0-896b-fa5e984d2dd2_terseLabel_en-US" xlink:label="lab_htgc_CumulativeUnrealizedGainLossOnDerivatives" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Derivatives, gain (loss) value</link:label>
    <link:label id="lab_htgc_CumulativeUnrealizedGainLossOnDerivatives_label_en-US" xlink:label="lab_htgc_CumulativeUnrealizedGainLossOnDerivatives" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cumulative Unrealized Gain Loss On Derivatives</link:label>
    <link:label id="lab_htgc_CumulativeUnrealizedGainLossOnDerivatives_documentation_en-US" xlink:label="lab_htgc_CumulativeUnrealizedGainLossOnDerivatives" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cumulative Unrealized Gain Loss On Derivatives</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_CumulativeUnrealizedGainLossOnDerivatives" xlink:href="htgc-20231231.xsd#htgc_CumulativeUnrealizedGainLossOnDerivatives"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_CumulativeUnrealizedGainLossOnDerivatives" xlink:to="lab_htgc_CumulativeUnrealizedGainLossOnDerivatives" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ContractualObligationDueInSecondAndThirdYear_d0b64d50-e419-4d20-8883-d7db053ff37c_terseLabel_en-US" xlink:label="lab_us-gaap_ContractualObligationDueInSecondAndThirdYear" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Contractual Obligations 1-3 years</link:label>
    <link:label id="lab_us-gaap_ContractualObligationDueInSecondAndThirdYear_label_en-US" xlink:label="lab_us-gaap_ContractualObligationDueInSecondAndThirdYear" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Contractual Obligation, to be Paid, Year Two and Three</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractualObligationDueInSecondAndThirdYear" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ContractualObligationDueInSecondAndThirdYear"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ContractualObligationDueInSecondAndThirdYear" xlink:to="lab_us-gaap_ContractualObligationDueInSecondAndThirdYear" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_SBADebenturesIssuedOnJanuaryTwentyOneTwoThousandAndTwentyTwoMember_a1487ce7-d20c-4ea3-9a0a-d8a77cd07c65_terseLabel_en-US" xlink:label="lab_htgc_SBADebenturesIssuedOnJanuaryTwentyOneTwoThousandAndTwentyTwoMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">SBA Debentures Issued on January 21, 2022</link:label>
    <link:label id="lab_htgc_SBADebenturesIssuedOnJanuaryTwentyOneTwoThousandAndTwentyTwoMember_label_en-US" xlink:label="lab_htgc_SBADebenturesIssuedOnJanuaryTwentyOneTwoThousandAndTwentyTwoMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">S B A Debentures Issued On January Twenty One Two Thousand And Twenty Two [Member]</link:label>
    <link:label id="lab_htgc_SBADebenturesIssuedOnJanuaryTwentyOneTwoThousandAndTwentyTwoMember_documentation_en-US" xlink:label="lab_htgc_SBADebenturesIssuedOnJanuaryTwentyOneTwoThousandAndTwentyTwoMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">SBA debentures issued on january twenty one, two thousand and twenty two.</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htgc_SBADebenturesIssuedOnJanuaryTwentyOneTwoThousandAndTwentyTwoMember" xlink:to="lab_htgc_SBADebenturesIssuedOnJanuaryTwentyOneTwoThousandAndTwentyTwoMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_036cd11d-9110-4894-8a4a-7eef7f64de03_terseLabel_en-US" xlink:label="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Stock-based compensation</link:label>
    <link:label id="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_label_en-US" xlink:label="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">APIC, Share-Based Payment Arrangement, Increase for Cost Recognition</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue" xlink:to="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LaborAndRelatedExpense_458cf833-170f-40e7-a514-af6bc851c26e_terseLabel_en-US" xlink:label="lab_us-gaap_LaborAndRelatedExpense" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Compensation and benefits</link:label>
    <link:label id="lab_us-gaap_LaborAndRelatedExpense_label_en-US" xlink:label="lab_us-gaap_LaborAndRelatedExpense" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Labor and Related Expense</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LaborAndRelatedExpense" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LaborAndRelatedExpense"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LaborAndRelatedExpense" xlink:to="lab_us-gaap_LaborAndRelatedExpense" xlink:type="arc" order="1"/>
    <link:label id="lab_htgc_GrossCAAdditions_f4e1f812-8b49-4228-a682-3bba05aa140e_terseLabel_en-US" xlink:label="lab_htgc_GrossCAAdditions" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Gross Additions</link:label>
    <link:label id="lab_htgc_GrossCAAdditions_label_en-US" xlink:label="lab_htgc_GrossCAAdditions" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Gross C A Additions</link:label>
    <link:label id="lab_htgc_GrossCAAdditions_documentation_en-US" xlink:label="lab_htgc_GrossCAAdditions" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Gross C A additions.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_htgc_GrossCAAdditions" xlink:href="htgc-20231231.xsd#htgc_GrossCAAdditions"/>
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