<?xml version="1.0" encoding="utf-8"?>
<!--XBRL document created with Toppan Merrill Bridge  11.3.0.1 -->
<!--Based on XBRL 2.1-->
<!--Created on: 5/20/2026 5:35:38 PM-->
<!--Modified on: 5/20/2026 5:35:38 PM-->
<link:linkbase xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:xlink="http://www.w3.org/1999/xlink">
  <roleRef xlink:type="simple" xlink:href="gbdc-20260519.xsd#DocumentDocumentAndEntityInformation" roleURI="http://golubcapitalbdc.com/role/DocumentDocumentAndEntityInformation" xmlns="http://www.xbrl.org/2003/linkbase" />
  <roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/cef/2025/cef-2025.xsd#N2" roleURI="http://xbrl.sec.gov/cef/role/N2" xmlns="http://www.xbrl.org/2003/linkbase" />
  <presentationLink xlink:role="http://golubcapitalbdc.com/role/DocumentDocumentAndEntityInformation" xlink:type="extended" xlink:title="995200090 - Document - Document and Entity Information" xmlns="http://www.xbrl.org/2003/linkbase">
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CoverAbstract" xlink:label="CoverAbstract" />
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentType" xlink:label="dei_DocumentType_639148953382673009" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="CoverAbstract" xlink:to="dei_DocumentType_639148953382673009" order="1" use="optional" />
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityRegistrantName" xlink:label="dei_EntityRegistrantName_639148953382673009" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="CoverAbstract" xlink:to="dei_EntityRegistrantName_639148953382673009" order="2" use="optional" />
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCentralIndexKey" xlink:label="dei_EntityCentralIndexKey_639148953382673009" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="CoverAbstract" xlink:to="dei_EntityCentralIndexKey_639148953382673009" order="3" use="optional" />
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AmendmentFlag" xlink:label="dei_AmendmentFlag_639148953382673009" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="CoverAbstract" xlink:to="dei_AmendmentFlag_639148953382673009" order="4" use="optional" />
  </presentationLink>
  <presentationLink xlink:role="http://xbrl.sec.gov/cef/role/N2" xlink:type="extended" xlink:title="995470 - Disclosure - N-2" xmlns="http://www.xbrl.org/2003/linkbase">
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_DebtInstrumentNameDomain_639148953382673009" xlink:to="gbdc_Debt2024SecuritizationMember_639148953382673009" order="1" use="optional" preferredLabel="http://www.xbrl.org/2003/role/label" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_DebtInstrumentNameDomain_639148953382673009" xlink:to="gbdc_JpmCreditFacilityMember_639148953382673009" order="2" use="optional" preferredLabel="http://www.xbrl.org/2003/role/label" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_DebtInstrumentNameDomain_639148953382673009" xlink:to="gbdc_AdviserRevolverMember_639148953382673009" order="3" use="optional" preferredLabel="http://www.xbrl.org/2003/role/label" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_DebtInstrumentNameDomain_639148953382673009" xlink:to="gbdc_Notes2026Member_639148953382721197" order="4" use="optional" preferredLabel="http://www.xbrl.org/2003/role/label" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_DebtInstrumentNameDomain_639148953382673009" xlink:to="gbdc_Notes2027Member_639148953382721197" order="5" use="optional" preferredLabel="http://www.xbrl.org/2003/role/label" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_DebtInstrumentNameDomain_639148953382673009" xlink:to="gbdc_Notes2028Member_639148953382721197" order="6" use="optional" preferredLabel="http://www.xbrl.org/2003/role/label" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_DebtInstrumentNameDomain_639148953382673009" xlink:to="gbdc_Notes2029Member_639148953382721197" order="7" use="optional" preferredLabel="http://www.xbrl.org/2003/role/label" />
    <loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="us-gaap_DebtInstrumentNameDomain_639148953382673009" />
    <loc xlink:type="locator" xlink:href="gbdc-20260519.xsd#gbdc_Debt2024SecuritizationMember" xlink:label="gbdc_Debt2024SecuritizationMember_639148953382673009" />
    <loc xlink:type="locator" xlink:href="gbdc-20260519.xsd#gbdc_JpmCreditFacilityMember" xlink:label="gbdc_JpmCreditFacilityMember_639148953382673009" />
    <loc xlink:type="locator" xlink:href="gbdc-20260519.xsd#gbdc_AdviserRevolverMember" xlink:label="gbdc_AdviserRevolverMember_639148953382673009" />
    <loc xlink:type="locator" xlink:href="gbdc-20260519.xsd#gbdc_Notes2026Member" xlink:label="gbdc_Notes2026Member_639148953382721197" />
    <loc xlink:type="locator" xlink:href="gbdc-20260519.xsd#gbdc_Notes2027Member" xlink:label="gbdc_Notes2027Member_639148953382721197" />
    <loc xlink:type="locator" xlink:href="gbdc-20260519.xsd#gbdc_Notes2028Member" xlink:label="gbdc_Notes2028Member_639148953382721197" />
    <loc xlink:type="locator" xlink:href="gbdc-20260519.xsd#gbdc_Notes2029Member" xlink:label="gbdc_Notes2029Member_639148953382721197" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_ClassOfStockDomain_639148953382673009" xlink:to="gbdc_CommonSharesMember_639148953382673009" order="1" use="optional" preferredLabel="http://www.xbrl.org/2003/role/label" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_ClassOfStockDomain_639148953382673009" xlink:to="gbdc_PreferredSharesMember_639148953382673009" order="2" use="optional" preferredLabel="http://www.xbrl.org/2003/role/label" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_ClassOfStockDomain_639148953382673009" xlink:to="gbdc_SubscriptionRightsMember_639148953382673009" order="3" use="optional" preferredLabel="http://www.xbrl.org/2003/role/label" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_ClassOfStockDomain_639148953382673009" xlink:to="gbdc_WarrantsMember_639148953382673009" order="4" use="optional" preferredLabel="http://www.xbrl.org/2003/role/label" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_ClassOfStockDomain_639148953382673009" xlink:to="gbdc_DebtSecurityMember_639148953382673009" order="5" use="optional" preferredLabel="http://www.xbrl.org/2003/role/label" />
    <loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain" xlink:label="us-gaap_ClassOfStockDomain_639148953382673009" />
    <loc xlink:type="locator" xlink:href="gbdc-20260519.xsd#gbdc_CommonSharesMember" xlink:label="gbdc_CommonSharesMember_639148953382673009" />
    <loc xlink:type="locator" xlink:href="gbdc-20260519.xsd#gbdc_PreferredSharesMember" xlink:label="gbdc_PreferredSharesMember_639148953382673009" />
    <loc xlink:type="locator" xlink:href="gbdc-20260519.xsd#gbdc_SubscriptionRightsMember" xlink:label="gbdc_SubscriptionRightsMember_639148953382673009" />
    <loc xlink:type="locator" xlink:href="gbdc-20260519.xsd#gbdc_WarrantsMember" xlink:label="gbdc_WarrantsMember_639148953382673009" />
    <loc xlink:type="locator" xlink:href="gbdc-20260519.xsd#gbdc_DebtSecurityMember" xlink:label="gbdc_DebtSecurityMember_639148953382673009" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="cef_AllRisksMember_639148953382721197" xlink:to="gbdc_NotesWillBeUnsecuredAndThereforeWillBeEffectivelySubordinatedToAnySecuredIndebtednessCurrentlyIncurredOrMayIncurInFutureMember_639148953382721197" order="3" use="optional" preferredLabel="http://www.xbrl.org/2003/role/label" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="cef_AllRisksMember_639148953382721197" xlink:to="gbdc_NotesWillBeStructurallySubordinatedToIndebtednessAndOtherLiabilitiesOfSubsidiariesMember_639148953382736475" order="4" use="optional" preferredLabel="http://www.xbrl.org/2003/role/label" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="cef_AllRisksMember_639148953382721197" xlink:to="gbdc_IndentureGoverningNotesWillContainLimitedProtectionForHoldersOfNotesMember_639148953382737272" order="5" use="optional" preferredLabel="http://www.xbrl.org/2003/role/label" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="cef_AllRisksMember_639148953382721197" xlink:to="gbdc_DebtOutstandingIncreaseAffectPaymentObligationsUnderNotesAndOtherDebtMember_639148953382737272" order="6" use="optional" preferredLabel="http://www.xbrl.org/2003/role/label" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="cef_AllRisksMember_639148953382721197" xlink:to="gbdc_ActiveTradingMarketForNotesNotAbleToResellMember_639148953382738957" order="7" use="optional" preferredLabel="http://www.xbrl.org/2003/role/label" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="cef_AllRisksMember_639148953382721197" xlink:to="gbdc_DefaultOnObligationsToPayOtherIndebtednessMayNotBeAbleToMakePaymentsOnNotesMember_639148953382738957" order="8" use="optional" preferredLabel="http://www.xbrl.org/2003/role/label" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="cef_AllRisksMember_639148953382721197" xlink:to="gbdc_DowngradeOrWithdrawalOfRatingAssignedByRatingAgencyToNotesMember_639148953382738957" order="9" use="optional" preferredLabel="http://www.xbrl.org/2003/role/label" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="cef_AllRisksMember_639148953382721197" xlink:to="gbdc_IncreaseInMarketInterestRatesResultsInMarketValueOfNotesMember_639148953382738957" order="10" use="optional" preferredLabel="http://www.xbrl.org/2003/role/label" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="cef_AllRisksMember_639148953382721197" xlink:to="gbdc_OptionalRedemptionProvisionAffectReturnOnNotesMember_639148953382738957" order="11" use="optional" preferredLabel="http://www.xbrl.org/2003/role/label" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="cef_AllRisksMember_639148953382721197" xlink:to="gbdc_MayNotBeAbleToRepurchaseNotesUponChangeOfControlRepurchaseEventMember_639148953382738957" order="12" use="optional" preferredLabel="http://www.xbrl.org/2003/role/label" />
    <loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/cef/2025/cef-2025.xsd#cef_AllRisksMember" xlink:label="cef_AllRisksMember_639148953382721197" />
    <loc xlink:type="locator" xlink:href="gbdc-20260519.xsd#gbdc_NotesWillBeUnsecuredAndThereforeWillBeEffectivelySubordinatedToAnySecuredIndebtednessCurrentlyIncurredOrMayIncurInFutureMember" xlink:label="gbdc_NotesWillBeUnsecuredAndThereforeWillBeEffectivelySubordinatedToAnySecuredIndebtednessCurrentlyIncurredOrMayIncurInFutureMember_639148953382721197" />
    <loc xlink:type="locator" xlink:href="gbdc-20260519.xsd#gbdc_NotesWillBeStructurallySubordinatedToIndebtednessAndOtherLiabilitiesOfSubsidiariesMember" xlink:label="gbdc_NotesWillBeStructurallySubordinatedToIndebtednessAndOtherLiabilitiesOfSubsidiariesMember_639148953382736475" />
    <loc xlink:type="locator" xlink:href="gbdc-20260519.xsd#gbdc_IndentureGoverningNotesWillContainLimitedProtectionForHoldersOfNotesMember" xlink:label="gbdc_IndentureGoverningNotesWillContainLimitedProtectionForHoldersOfNotesMember_639148953382737272" />
    <loc xlink:type="locator" xlink:href="gbdc-20260519.xsd#gbdc_DebtOutstandingIncreaseAffectPaymentObligationsUnderNotesAndOtherDebtMember" xlink:label="gbdc_DebtOutstandingIncreaseAffectPaymentObligationsUnderNotesAndOtherDebtMember_639148953382737272" />
    <loc xlink:type="locator" xlink:href="gbdc-20260519.xsd#gbdc_ActiveTradingMarketForNotesNotAbleToResellMember" xlink:label="gbdc_ActiveTradingMarketForNotesNotAbleToResellMember_639148953382738957" />
    <loc xlink:type="locator" xlink:href="gbdc-20260519.xsd#gbdc_DefaultOnObligationsToPayOtherIndebtednessMayNotBeAbleToMakePaymentsOnNotesMember" xlink:label="gbdc_DefaultOnObligationsToPayOtherIndebtednessMayNotBeAbleToMakePaymentsOnNotesMember_639148953382738957" />
    <loc xlink:type="locator" xlink:href="gbdc-20260519.xsd#gbdc_DowngradeOrWithdrawalOfRatingAssignedByRatingAgencyToNotesMember" xlink:label="gbdc_DowngradeOrWithdrawalOfRatingAssignedByRatingAgencyToNotesMember_639148953382738957" />
    <loc xlink:type="locator" xlink:href="gbdc-20260519.xsd#gbdc_IncreaseInMarketInterestRatesResultsInMarketValueOfNotesMember" xlink:label="gbdc_IncreaseInMarketInterestRatesResultsInMarketValueOfNotesMember_639148953382738957" />
    <loc xlink:type="locator" xlink:href="gbdc-20260519.xsd#gbdc_OptionalRedemptionProvisionAffectReturnOnNotesMember" xlink:label="gbdc_OptionalRedemptionProvisionAffectReturnOnNotesMember_639148953382738957" />
    <loc xlink:type="locator" xlink:href="gbdc-20260519.xsd#gbdc_MayNotBeAbleToRepurchaseNotesUponChangeOfControlRepurchaseEventMember" xlink:label="gbdc_MayNotBeAbleToRepurchaseNotesUponChangeOfControlRepurchaseEventMember_639148953382738957" />
  </presentationLink>
</link:linkbase>
