<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019e467c-9a09-78c5-96c8-62df86cee1f9,g:e201ae34-0954-47d8-9b54-4d49e42b1b18-->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:ocsl="http://ocsl.com/20260630" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:dtr-types="http://www.xbrl.org/dtr/type/2024-01-31" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="http://ocsl.com/20260630">
  <xs:import namespace="http://fasb.org/srt/2026" schemaLocation="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd"/>
  <xs:import namespace="http://fasb.org/us-gaap/2026" schemaLocation="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd"/>
  <xs:import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/dtr/type/2024-01-31" schemaLocation="https://www.xbrl.org/dtr/type/2024-01-31/types.xsd"/>
  <xs:import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd"/>
  <xs:import namespace="http://xbrl.org/2006/xbrldi" schemaLocation="http://www.xbrl.org/2006/xbrldi-2006.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/cef-pre/2026" schemaLocation="https://xbrl.sec.gov/cef/2026/cef-2026_pre.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/dei/2026" schemaLocation="https://xbrl.sec.gov/dei/2026/dei-2026.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/ecd/2026" schemaLocation="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd"/>
  <xs:annotation>
    <xs:appinfo>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="ocsl-20260630_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="ocsl-20260630_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="ocsl-20260630_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="ocsl-20260630_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:type="simple"/>
      <link:roleType id="Cover" roleURI="http://ocsl.com/role/Cover">
        <link:definition>0000001 - Document - Cover</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedStatementsofAssetsandLiabilities" roleURI="http://ocsl.com/role/ConsolidatedStatementsofAssetsandLiabilities">
        <link:definition>0000002 - Statement - Consolidated Statements of Assets and Liabilities</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedStatementsofAssetsandLiabilitiesParenthetical" roleURI="http://ocsl.com/role/ConsolidatedStatementsofAssetsandLiabilitiesParenthetical">
        <link:definition>0000003 - Statement - Consolidated Statements of Assets and Liabilities (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedStatementsofOperations" roleURI="http://ocsl.com/role/ConsolidatedStatementsofOperations">
        <link:definition>0000004 - Statement - Consolidated Statements of Operations</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedStatementsofChangesinNetAssets" roleURI="http://ocsl.com/role/ConsolidatedStatementsofChangesinNetAssets">
        <link:definition>0000005 - Statement - Consolidated Statements of Changes in Net Assets</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedStatementofCashFlows" roleURI="http://ocsl.com/role/ConsolidatedStatementofCashFlows">
        <link:definition>0000006 - Statement - Consolidated Statement of Cash Flows</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedStatementofCashFlowsParenthetical" roleURI="http://ocsl.com/role/ConsolidatedStatementofCashFlowsParenthetical">
        <link:definition>0000007 - Statement - Consolidated Statement of Cash Flows (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedScheduleofInvestments" roleURI="http://ocsl.com/role/ConsolidatedScheduleofInvestments">
        <link:definition>0000008 - Statement - Consolidated Schedule of Investments</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedScheduleofInvestments_1" roleURI="http://ocsl.com/role/ConsolidatedScheduleofInvestments_1">
        <link:definition>0000008 - Statement - Consolidated Schedule of Investments</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedScheduleofInvestmentsDerivativesForeignCurrencyForwardContracts" roleURI="http://ocsl.com/role/ConsolidatedScheduleofInvestmentsDerivativesForeignCurrencyForwardContracts">
        <link:definition>0000009 - Statement - Consolidated Schedule of Investments - Derivatives, Foreign Currency Forward Contracts</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedScheduleofInvestmentsDerivativesForeignCurrencyForwardContracts_1" roleURI="http://ocsl.com/role/ConsolidatedScheduleofInvestmentsDerivativesForeignCurrencyForwardContracts_1">
        <link:definition>0000009 - Statement - Consolidated Schedule of Investments - Derivatives, Foreign Currency Forward Contracts</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedScheduleofInvestmentsDerivativesInterestRateSwap" roleURI="http://ocsl.com/role/ConsolidatedScheduleofInvestmentsDerivativesInterestRateSwap">
        <link:definition>0000010 - Statement - Consolidated Schedule of Investments - Derivatives, Interest Rate Swap</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedScheduleofInvestmentsDerivativesInterestRateSwap_1" roleURI="http://ocsl.com/role/ConsolidatedScheduleofInvestmentsDerivativesInterestRateSwap_1">
        <link:definition>0000010 - Statement - Consolidated Schedule of Investments - Derivatives, Interest Rate Swap</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedScheduleofInvestmentsParenthetical" roleURI="http://ocsl.com/role/ConsolidatedScheduleofInvestmentsParenthetical">
        <link:definition>0000011 - Statement - Consolidated Schedule of Investments - Parenthetical</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Organization" roleURI="http://ocsl.com/role/Organization">
        <link:definition>0000012 - Disclosure - Organization</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SignificantAccountingPolicies" roleURI="http://ocsl.com/role/SignificantAccountingPolicies">
        <link:definition>0000013 - Disclosure - Significant Accounting Policies</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PortfolioInvestments" roleURI="http://ocsl.com/role/PortfolioInvestments">
        <link:definition>0000014 - Disclosure - Portfolio Investments</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FeeIncome" roleURI="http://ocsl.com/role/FeeIncome">
        <link:definition>0000015 - Disclosure - Fee Income</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ShareDataandNetAssets" roleURI="http://ocsl.com/role/ShareDataandNetAssets">
        <link:definition>0000016 - Disclosure - Share Data and Net Assets</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Borrowings" roleURI="http://ocsl.com/role/Borrowings">
        <link:definition>0000017 - Disclosure - Borrowings</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="TaxableDistributableIncomeandDividendDistributions" roleURI="http://ocsl.com/role/TaxableDistributableIncomeandDividendDistributions">
        <link:definition>0000018 - Disclosure - Taxable/Distributable Income and Dividend Distributions</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RealizedGainsorLossesandNetUnrealizedAppreciationorDepreciation" roleURI="http://ocsl.com/role/RealizedGainsorLossesandNetUnrealizedAppreciationorDepreciation">
        <link:definition>0000019 - Disclosure - Realized Gains or Losses and Net Unrealized Appreciation or Depreciation</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConcentrationofCreditRisks" roleURI="http://ocsl.com/role/ConcentrationofCreditRisks">
        <link:definition>0000020 - Disclosure - Concentration of Credit Risks</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RelatedPartyTransactions" roleURI="http://ocsl.com/role/RelatedPartyTransactions">
        <link:definition>0000021 - Disclosure - Related Party Transactions</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FinancialHighlights" roleURI="http://ocsl.com/role/FinancialHighlights">
        <link:definition>0000022 - Disclosure - Financial Highlights</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DerivativeInstruments" roleURI="http://ocsl.com/role/DerivativeInstruments">
        <link:definition>0000023 - Disclosure - Derivative Instruments</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CommitmentsandContingencies" roleURI="http://ocsl.com/role/CommitmentsandContingencies">
        <link:definition>0000024 - Disclosure - Commitments and Contingencies</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SubsequentEvents" roleURI="http://ocsl.com/role/SubsequentEvents">
        <link:definition>0000025 - Disclosure - Subsequent Events</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Schedule1214" roleURI="http://ocsl.com/role/Schedule1214">
        <link:definition>0000026 - Disclosure - Schedule&#160;12-14</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SignificantAccountingPoliciesPolicies" roleURI="http://ocsl.com/role/SignificantAccountingPoliciesPolicies">
        <link:definition>9955511 - Disclosure - Significant Accounting Policies (Policies)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PortfolioInvestmentsTables" roleURI="http://ocsl.com/role/PortfolioInvestmentsTables">
        <link:definition>9955512 - Disclosure - Portfolio Investments (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ShareDataandNetAssetsTables" roleURI="http://ocsl.com/role/ShareDataandNetAssetsTables">
        <link:definition>9955513 - Disclosure - Share Data and Net Assets (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BorrowingsTables" roleURI="http://ocsl.com/role/BorrowingsTables">
        <link:definition>9955514 - Disclosure - Borrowings (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="TaxableDistributableIncomeandDividendDistributionsTables" roleURI="http://ocsl.com/role/TaxableDistributableIncomeandDividendDistributionsTables">
        <link:definition>9955515 - Disclosure - Taxable/Distributable Income and Dividend Distributions (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RealizedGainsorLossesandNetUnrealizedAppreciationorDepreciationTables" roleURI="http://ocsl.com/role/RealizedGainsorLossesandNetUnrealizedAppreciationorDepreciationTables">
        <link:definition>9955516 - Disclosure - Realized Gains or Losses and Net Unrealized Appreciation or Depreciation (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FinancialHighlightsTables" roleURI="http://ocsl.com/role/FinancialHighlightsTables">
        <link:definition>9955517 - Disclosure - Financial Highlights (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DerivativeInstrumentsTables" roleURI="http://ocsl.com/role/DerivativeInstrumentsTables">
        <link:definition>9955518 - Disclosure - Derivative Instruments (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CommitmentsandContingenciesTables" roleURI="http://ocsl.com/role/CommitmentsandContingenciesTables">
        <link:definition>9955519 - Disclosure - Commitments and Contingencies (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SignificantAccountingPoliciesDetails" roleURI="http://ocsl.com/role/SignificantAccountingPoliciesDetails">
        <link:definition>9955520 - Disclosure - Significant Accounting Policies (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PortfolioInvestmentsNarrativeDetails" roleURI="http://ocsl.com/role/PortfolioInvestmentsNarrativeDetails">
        <link:definition>9955521 - Disclosure - Portfolio Investments - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PortfolioInvestmentsNarrativeDetails_1" roleURI="http://ocsl.com/role/PortfolioInvestmentsNarrativeDetails_1">
        <link:definition>9955521 - Disclosure - Portfolio Investments - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PortfolioInvestmentsScheduleofCompositionofInvestmentsDetails" roleURI="http://ocsl.com/role/PortfolioInvestmentsScheduleofCompositionofInvestmentsDetails">
        <link:definition>9955522 - Disclosure - Portfolio Investments - Schedule of Composition of Investments (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PortfolioInvestmentsScheduleofFinancialInstrumentsCarriedatFairValueDetails" roleURI="http://ocsl.com/role/PortfolioInvestmentsScheduleofFinancialInstrumentsCarriedatFairValueDetails">
        <link:definition>9955523 - Disclosure - Portfolio Investments - Schedule of Financial Instruments Carried at Fair Value (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PortfolioInvestmentsScheduleofRollForwardintheChangesinFairValueDetails" roleURI="http://ocsl.com/role/PortfolioInvestmentsScheduleofRollForwardintheChangesinFairValueDetails">
        <link:definition>9955524 - Disclosure - Portfolio Investments - Schedule of Roll-Forward in the Changes in Fair Value (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PortfolioInvestmentsScheduleofRollForwardintheChangesinFairValueDetails_1" roleURI="http://ocsl.com/role/PortfolioInvestmentsScheduleofRollForwardintheChangesinFairValueDetails_1">
        <link:definition>9955524 - Disclosure - Portfolio Investments - Schedule of Roll-Forward in the Changes in Fair Value (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PortfolioInvestmentsScheduleofSignificantUnobservableInputsforLevel3InvestmentsDetails" roleURI="http://ocsl.com/role/PortfolioInvestmentsScheduleofSignificantUnobservableInputsforLevel3InvestmentsDetails">
        <link:definition>9955525 - Disclosure - Portfolio Investments - Schedule of Significant Unobservable Inputs for Level 3 Investments (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PortfolioInvestmentsScheduleofFinancialInstrumentsDisclosedbutCarriedatFairValueDetails" roleURI="http://ocsl.com/role/PortfolioInvestmentsScheduleofFinancialInstrumentsDisclosedbutCarriedatFairValueDetails">
        <link:definition>9955526 - Disclosure - Portfolio Investments - Schedule of Financial Instruments Disclosed, but Carried at Fair Value (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PortfolioInvestmentsScheduleofPortfolioCompositionDetails" roleURI="http://ocsl.com/role/PortfolioInvestmentsScheduleofPortfolioCompositionDetails">
        <link:definition>9955527 - Disclosure - Portfolio Investments - Schedule of Portfolio Composition (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PortfolioInvestmentsScheduleofPortfolioofInvestmentsbyIndustryDetails" roleURI="http://ocsl.com/role/PortfolioInvestmentsScheduleofPortfolioofInvestmentsbyIndustryDetails">
        <link:definition>9955528 - Disclosure - Portfolio Investments - Schedule of Portfolio of Investments by Industry (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PortfolioInvestmentsScheduleofPortfolioDetails" roleURI="http://ocsl.com/role/PortfolioInvestmentsScheduleofPortfolioDetails">
        <link:definition>9955529 - Disclosure - Portfolio Investments - Schedule of Portfolio (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PortfolioInvestmentsScheduleofPortfolioDetails_1" roleURI="http://ocsl.com/role/PortfolioInvestmentsScheduleofPortfolioDetails_1">
        <link:definition>9955529 - Disclosure - Portfolio Investments - Schedule of Portfolio (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PortfolioInvestmentsScheduleofPortfolioListingDetails" roleURI="http://ocsl.com/role/PortfolioInvestmentsScheduleofPortfolioListingDetails">
        <link:definition>9955530 - Disclosure - Portfolio Investments - Schedule of Portfolio Listing (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PortfolioInvestmentsScheduleofPortfolioListingDetails_1" roleURI="http://ocsl.com/role/PortfolioInvestmentsScheduleofPortfolioListingDetails_1">
        <link:definition>9955530 - Disclosure - Portfolio Investments - Schedule of Portfolio Listing (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PortfolioInvestmentsScheduleofSummarizedBalanceSheetInformationDetails" roleURI="http://ocsl.com/role/PortfolioInvestmentsScheduleofSummarizedBalanceSheetInformationDetails">
        <link:definition>9955531 - Disclosure - Portfolio Investments - Schedule of Summarized Balance Sheet Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PortfolioInvestmentsScheduleofSummarizedStatementofOperationsInformationDetails" roleURI="http://ocsl.com/role/PortfolioInvestmentsScheduleofSummarizedStatementofOperationsInformationDetails">
        <link:definition>9955532 - Disclosure - Portfolio Investments - Schedule of Summarized Statement of Operations Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FeeIncomeDetails" roleURI="http://ocsl.com/role/FeeIncomeDetails">
        <link:definition>9955533 - Disclosure - Fee Income (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ShareDataandNetAssetsScheduleofBasicandDilutedEarningsPerShareDetails" roleURI="http://ocsl.com/role/ShareDataandNetAssetsScheduleofBasicandDilutedEarningsPerShareDetails">
        <link:definition>9955534 - Disclosure - Share Data and Net Assets - Schedule of Basic and Diluted Earnings Per Share (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ShareDataandNetAssetsScheduleofChangesinNetAssetsDetails" roleURI="http://ocsl.com/role/ShareDataandNetAssetsScheduleofChangesinNetAssetsDetails">
        <link:definition>9955535 - Disclosure - Share Data and Net Assets - Schedule of Changes in Net Assets (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ShareDataandNetAssetsNarrativeDetails" roleURI="http://ocsl.com/role/ShareDataandNetAssetsNarrativeDetails">
        <link:definition>9955536 - Disclosure - Share Data and Net Assets - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ShareDataandNetAssetsScheduleofDistributionsDetails" roleURI="http://ocsl.com/role/ShareDataandNetAssetsScheduleofDistributionsDetails">
        <link:definition>9955537 - Disclosure - Share Data and Net Assets - Schedule of Distributions (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ShareDataandNetAssetsScheduleofCommonStockIssuedandSoldDetails" roleURI="http://ocsl.com/role/ShareDataandNetAssetsScheduleofCommonStockIssuedandSoldDetails">
        <link:definition>9955538 - Disclosure - Share Data and Net Assets - Schedule of Common Stock Issued and Sold (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BorrowingsNarrativeDetails" roleURI="http://ocsl.com/role/BorrowingsNarrativeDetails">
        <link:definition>9955539 - Disclosure - Borrowings - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BorrowingsScheduleofComponentsoftheCarryingValueofNotesDetails" roleURI="http://ocsl.com/role/BorrowingsScheduleofComponentsoftheCarryingValueofNotesDetails">
        <link:definition>9955540 - Disclosure - Borrowings - Schedule of Components of the Carrying Value of Notes (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BorrowingsScheduleofComponentsofInterestandOtherDebtExpensesDetails" roleURI="http://ocsl.com/role/BorrowingsScheduleofComponentsofInterestandOtherDebtExpensesDetails">
        <link:definition>9955541 - Disclosure - Borrowings - Schedule of Components of Interest and Other Debt Expenses (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="TaxableDistributableIncomeandDividendDistributionsNarrativeDetails" roleURI="http://ocsl.com/role/TaxableDistributableIncomeandDividendDistributionsNarrativeDetails">
        <link:definition>9955542 - Disclosure - Taxable/Distributable Income and Dividend Distributions - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="TaxableDistributableIncomeandDividendDistributionsScheduleofReconciliationofNetIncreaseDecreaseinNetAssetsResultingfromOperationsDetails" roleURI="http://ocsl.com/role/TaxableDistributableIncomeandDividendDistributionsScheduleofReconciliationofNetIncreaseDecreaseinNetAssetsResultingfromOperationsDetails">
        <link:definition>9955543 - Disclosure - Taxable/Distributable Income and Dividend Distributions - Schedule of Reconciliation of Net Increase (Decrease) in Net Assets Resulting from Operations (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="TaxableDistributableIncomeandDividendDistributionsScheduleofComponentsofAccumulatedOverdistributedEarningsDetails" roleURI="http://ocsl.com/role/TaxableDistributableIncomeandDividendDistributionsScheduleofComponentsofAccumulatedOverdistributedEarningsDetails">
        <link:definition>9955544 - Disclosure - Taxable/Distributable Income and Dividend Distributions - Schedule of Components of Accumulated Overdistributed Earnings (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RealizedGainsorLossesandNetUnrealizedAppreciationorDepreciationScheduleofAggregateNetRealizedGainsDetails" roleURI="http://ocsl.com/role/RealizedGainsorLossesandNetUnrealizedAppreciationorDepreciationScheduleofAggregateNetRealizedGainsDetails">
        <link:definition>9955545 - Disclosure - Realized Gains or Losses and Net Unrealized Appreciation or Depreciation - Schedule of Aggregate Net Realized Gains (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RealizedGainsorLossesandNetUnrealizedAppreciationorDepreciationNarrativeDetails" roleURI="http://ocsl.com/role/RealizedGainsorLossesandNetUnrealizedAppreciationorDepreciationNarrativeDetails">
        <link:definition>9955546 - Disclosure - Realized Gains or Losses and Net Unrealized Appreciation or Depreciation - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RelatedPartyTransactionsDetails" roleURI="http://ocsl.com/role/RelatedPartyTransactionsDetails">
        <link:definition>9955547 - Disclosure - Related Party Transactions (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FinancialHighlightsDetails" roleURI="http://ocsl.com/role/FinancialHighlightsDetails">
        <link:definition>9955548 - Disclosure - Financial Highlights (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DerivativeInstrumentsScheduleofForeignCurrencyForwardContractsandInterestRateSwapDetails" roleURI="http://ocsl.com/role/DerivativeInstrumentsScheduleofForeignCurrencyForwardContractsandInterestRateSwapDetails">
        <link:definition>9955549 - Disclosure - Derivative Instruments - Schedule of Foreign Currency Forward Contracts and Interest Rate Swap (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DerivativeInstrumentsScheduleofForeignCurrencyForwardContractsandInterestRateSwapDetails_1" roleURI="http://ocsl.com/role/DerivativeInstrumentsScheduleofForeignCurrencyForwardContractsandInterestRateSwapDetails_1">
        <link:definition>9955549 - Disclosure - Derivative Instruments - Schedule of Foreign Currency Forward Contracts and Interest Rate Swap (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DerivativeInstrumentsNarrativeDetails" roleURI="http://ocsl.com/role/DerivativeInstrumentsNarrativeDetails">
        <link:definition>9955550 - Disclosure - Derivative Instruments - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CommitmentsandContingenciesNarrativeDetails" roleURI="http://ocsl.com/role/CommitmentsandContingenciesNarrativeDetails">
        <link:definition>9955551 - Disclosure - Commitments and Contingencies - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CommitmentsandContingenciesScheduleofUnfundedCommitmentsbyInvestmentDetails" roleURI="http://ocsl.com/role/CommitmentsandContingenciesScheduleofUnfundedCommitmentsbyInvestmentDetails">
        <link:definition>9955552 - Disclosure - Commitments and Contingencies - Schedule of Unfunded Commitments by Investment (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CommitmentsandContingenciesScheduleofUnfundedCommitmentsbyInvestmentDetails_1" roleURI="http://ocsl.com/role/CommitmentsandContingenciesScheduleofUnfundedCommitmentsbyInvestmentDetails_1">
        <link:definition>9955552 - Disclosure - Commitments and Contingencies - Schedule of Unfunded Commitments by Investment (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SubsequentEventsDetails" roleURI="http://ocsl.com/role/SubsequentEventsDetails">
        <link:definition>9955553 - Disclosure - Subsequent Events (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Schedule1214ScheduleofInvestmentsinandAdvancestoAffiliatesDetails" roleURI="http://ocsl.com/role/Schedule1214ScheduleofInvestmentsinandAdvancestoAffiliatesDetails">
        <link:definition>9955554 - Disclosure - Schedule&#160;12-14 - Schedule of Investments in and Advances to Affiliates (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Schedule1214ScheduleofInvestmentsinandAdvancestoAffiliatesDetails_1" roleURI="http://ocsl.com/role/Schedule1214ScheduleofInvestmentsinandAdvancestoAffiliatesDetails_1">
        <link:definition>9955554 - Disclosure - Schedule&#160;12-14 - Schedule of Investments in and Advances to Affiliates (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
    </xs:appinfo>
  </xs:annotation>
  <xs:element id="ocsl_DueFromPortfolioCompanies" abstract="false" name="DueFromPortfolioCompanies" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ocsl_InvestmentUnaffiliatedIssuerPIKMember" abstract="true" name="InvestmentUnaffiliatedIssuerPIKMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_InterestIncomeOperatingIncludingDeposits" abstract="false" name="InterestIncomeOperatingIncludingDeposits" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ocsl_PIKInterestIncomeAbstract" abstract="true" name="PIKInterestIncomeAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="ocsl_FeeIncomeAbstract" abstract="true" name="FeeIncomeAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="ocsl_AdministrativeFeesExpenseAdministratorFees" abstract="false" name="AdministrativeFeesExpenseAdministratorFees" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ocsl_InvestmentOwnedRecognizedUnrealizedAppreciationDepreciationNetAbstract" abstract="true" name="InvestmentOwnedRecognizedUnrealizedAppreciationDepreciationNetAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="ocsl_NetRealizedGainsLossesAbstract" abstract="true" name="NetRealizedGainsLossesAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="ocsl_DistributionsToStockholders" abstract="false" name="DistributionsToStockholders" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ocsl_InvestmentCompanyShareholderTransactionsIncreaseDecrease" abstract="false" name="InvestmentCompanyShareholderTransactionsIncreaseDecrease" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ocsl_StockIssuedDuringPeriodValuePrivatePlacement" abstract="false" name="StockIssuedDuringPeriodValuePrivatePlacement" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ocsl_InvestmentCompanyCapitalShareTransactionsIncreaseDecrease" abstract="false" name="InvestmentCompanyCapitalShareTransactionsIncreaseDecrease" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ocsl_AdjustmentsToReconcileNetAssetsFromOperationsToCashProvidedByUsedInOperatingActivitiesAbstract" abstract="true" name="AdjustmentsToReconcileNetAssetsFromOperationsToCashProvidedByUsedInOperatingActivitiesAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="ocsl_IncreaseDecreaseInDueFromPortfolioCompanies" abstract="false" name="IncreaseDecreaseInDueFromPortfolioCompanies" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ocsl_NoncashFinancingItemsAbstract" abstract="true" name="NoncashFinancingItemsAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="ocsl_ShortTermInvestmentFundMember" abstract="true" name="ShortTermInvestmentFundMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_InvestmentOwnedOwnershipPercentage" abstract="false" name="InvestmentOwnedOwnershipPercentage" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="ocsl_MoneyMarketFundsFairValueDisclosure" abstract="false" name="MoneyMarketFundsFairValueDisclosure" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ocsl_EarnoutShareVestingAxis" abstract="true" name="EarnoutShareVestingAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="ocsl_EarnoutShareVestingDomain" abstract="true" name="EarnoutShareVestingDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_EarnoutShareVestingTrancheTwoMember" abstract="true" name="EarnoutShareVestingTrancheTwoMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_MoneyMarketFundsPercentOfNetAssets" abstract="false" name="MoneyMarketFundsPercentOfNetAssets" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="ocsl_DebtInstrumentFloorInterestRate" abstract="false" name="DebtInstrumentFloorInterestRate" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="ocsl_PercentageOfTotalAssetsRepresentingQualifyingAssets" abstract="false" name="PercentageOfTotalAssetsRepresentingQualifyingAssets" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="ocsl_PercentageOfTotalAssetsRepresentingNonQualifyingAssets" abstract="false" name="PercentageOfTotalAssetsRepresentingNonQualifyingAssets" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="ocsl_InvestmentOwnedBalanceShareVWAPThreshold" abstract="false" name="InvestmentOwnedBalanceShareVWAPThreshold" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="ocsl_InvestmentOwnedBalanceShareTradingDays" abstract="false" name="InvestmentOwnedBalanceShareTradingDays" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="ocsl_InvestmentOwnedBalanceSharesVWAPConsecutiveTradingDays" abstract="false" name="InvestmentOwnedBalanceSharesVWAPConsecutiveTradingDays" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="ocsl_FeeIncomeTextBlock" abstract="false" name="FeeIncomeTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="ocsl_InvestmentCompanyRealizedGainsLossesAndNetUnrealizedAppreciationDepreciationTextBlock" abstract="false" name="InvestmentCompanyRealizedGainsLossesAndNetUnrealizedAppreciationDepreciationTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="ocsl_DueFromPortfolioCompaniesPolicyPolicyTextBlock" abstract="false" name="DueFromPortfolioCompaniesPolicyPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="ocsl_UnsettledInvestmentTransactionsPolicyPolicyTextBlock" abstract="false" name="UnsettledInvestmentTransactionsPolicyPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="ocsl_DeferredFinancingCostsPolicyPolicyTextBlock" abstract="false" name="DeferredFinancingCostsPolicyPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="ocsl_DeferredOfferingCostsPolicyPolicyTextBlock" abstract="false" name="DeferredOfferingCostsPolicyPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="ocsl_InvestmentCompanyComponentsOfDistributableEarningsAccumulatedLossesTableTextBlock" abstract="false" name="InvestmentCompanyComponentsOfDistributableEarningsAccumulatedLossesTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="ocsl_ScheduleForFinancialSupportForNonconsolidatedEntityTableTextBlock" abstract="false" name="ScheduleForFinancialSupportForNonconsolidatedEntityTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="ocsl_InvestmentOwnedFairValueMember" abstract="true" name="InvestmentOwnedFairValueMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_InvestmentOwnedCostMember" abstract="true" name="InvestmentOwnedCostMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_NonAccrualStatusDebtSecuritiesMember" abstract="true" name="NonAccrualStatusDebtSecuritiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_InvestmentTypeConcentrationRiskMember" abstract="true" name="InvestmentTypeConcentrationRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_NumberOfInvestments" abstract="false" name="NumberOfInvestments" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="ocsl_SLFJVIMember" abstract="true" name="SLFJVIMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_OCSIGlickJVLLCMember" abstract="true" name="OCSIGlickJVLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_SLFJVINotesMember" abstract="true" name="SLFJVINotesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_SLFJVILLCMember" abstract="true" name="SLFJVILLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_GlickJVLLCMember" abstract="true" name="GlickJVLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_GlickJVNotesMember" abstract="true" name="GlickJVNotesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_TheJVsMember" abstract="true" name="TheJVsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_InvestmentOwnedAtFairValueMember" abstract="true" name="InvestmentOwnedAtFairValueMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_DebtSecuritiesSeniorSecuredMember" abstract="true" name="DebtSecuritiesSeniorSecuredMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_DebtSecuritiesSubordinatedIncludingJVDebtInstrumentsMember" abstract="true" name="DebtSecuritiesSubordinatedIncludingJVDebtInstrumentsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_A2027NotesMember" abstract="true" name="A2027NotesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_A2029NotesMember" abstract="true" name="A2029NotesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_A2030NotesMember" abstract="true" name="A2030NotesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_SLFJVIFacilityMember" abstract="true" name="SLFJVIFacilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_GlickJVFacilityMember" abstract="true" name="GlickJVFacilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_KemperMember" abstract="true" name="KemperMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_VariableRatePeriodAxis" abstract="true" name="VariableRatePeriodAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="ocsl_VariableRatePeriodDomain" abstract="true" name="VariableRatePeriodDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_UntilNovember32023Member" abstract="true" name="UntilNovember32023Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_InvestmentCompanyNumberOfBorrowers" abstract="false" name="InvestmentCompanyNumberOfBorrowers" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="ocsl_NumberOfBoardOfDirectors" abstract="false" name="NumberOfBoardOfDirectors" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="ocsl_NumberOfBoardOfDirectorsSelectedByCompany" abstract="false" name="NumberOfBoardOfDirectorsSelectedByCompany" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="ocsl_NumberOfBoardOfDirectorsSelectedByCounterparty" abstract="false" name="NumberOfBoardOfDirectorsSelectedByCounterparty" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="ocsl_NumberOfInvestmentCommitteeMembersSelectedByCompany" abstract="false" name="NumberOfInvestmentCommitteeMembersSelectedByCompany" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="ocsl_NumberOfInvestmentCommitteeMembersSelectedByCounterparty" abstract="false" name="NumberOfInvestmentCommitteeMembersSelectedByCounterparty" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="ocsl_InvestmentExchangedCost" abstract="false" name="InvestmentExchangedCost" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ocsl_InvestmentCompanyFinancialSupportToInvesteeContractuallyRequiredAndProvidedAmount" abstract="false" name="InvestmentCompanyFinancialSupportToInvesteeContractuallyRequiredAndProvidedAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ocsl_InvestmentCompanyFinancialSupportFundedForEquityInterestInInvesteeAmount" abstract="false" name="InvestmentCompanyFinancialSupportFundedForEquityInterestInInvesteeAmount" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ocsl_InvestmentCompanyFinancialCommitmentToInvesteeByCompanyAndCounterpartyAggregateAmount" abstract="false" name="InvestmentCompanyFinancialCommitmentToInvesteeByCompanyAndCounterpartyAggregateAmount" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ocsl_InvestmentCompanyFinancialCommitmentToInvesteeAggregateAmount" abstract="false" name="InvestmentCompanyFinancialCommitmentToInvesteeAggregateAmount" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ocsl_InvestmentCompanyFinancialCommitmentToInvesteeByCounterpartyAggregateAmount" abstract="false" name="InvestmentCompanyFinancialCommitmentToInvesteeByCounterpartyAggregateAmount" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ocsl_InvestmentCompanyFinancialSupportFundedForInvesteeByCompanyAndCounterpartyAmount" abstract="false" name="InvestmentCompanyFinancialSupportFundedForInvesteeByCompanyAndCounterpartyAmount" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ocsl_InvestmentCompanyFinancialSupportFundedForInvesteeAmount" abstract="false" name="InvestmentCompanyFinancialSupportFundedForInvesteeAmount" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ocsl_DebtSecuritiesJVMember" abstract="true" name="DebtSecuritiesJVMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_EquitySecuritiesJVMember" abstract="true" name="EquitySecuritiesJVMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_DebtSecuritiesFloatingRateMember" abstract="true" name="DebtSecuritiesFloatingRateMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_DebtSecuritiesFixedRateMember" abstract="true" name="DebtSecuritiesFixedRateMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_DebtSecuritiesPercentageOfDebtPortfolio" abstract="false" name="DebtSecuritiesPercentageOfDebtPortfolio" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="ocsl_EquitySecuritiesPreferredMember" abstract="true" name="EquitySecuritiesPreferredMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_EquitySecuritiesCommonAndWarrantsIncludingJVInvestmentsMember" abstract="true" name="EquitySecuritiesCommonAndWarrantsIncludingJVInvestmentsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_EquitySecuritiesCommonAndWarrantsMember" abstract="true" name="EquitySecuritiesCommonAndWarrantsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_InvestmentChangeInMarketQuotesOrLiquidityMember" abstract="true" name="InvestmentChangeInMarketQuotesOrLiquidityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSalesAndSettlements" abstract="false" name="FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSalesAndSettlements" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ocsl_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPIKInterestIncomeCapitalized" abstract="false" name="FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPIKInterestIncomeCapitalized" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ocsl_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAccretionOfDiscount" abstract="false" name="FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAccretionOfDiscount" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ocsl_EquitySecuritiesPreferredCommonMember" abstract="true" name="EquitySecuritiesPreferredCommonMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_ValuationEnterpriseValueMember" abstract="true" name="ValuationEnterpriseValueMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_ValuationTransactionPrecedentMember" abstract="true" name="ValuationTransactionPrecedentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_ValuationBrokerQuotationsMember" abstract="true" name="ValuationBrokerQuotationsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_MeasurementInputMarketYieldMember" abstract="true" name="MeasurementInputMarketYieldMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_MeasurementInputTransactionPriceMember" abstract="true" name="MeasurementInputTransactionPriceMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_MeasurementInputBrokerQuotedPriceMember" abstract="true" name="MeasurementInputBrokerQuotedPriceMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_MeasurementInputAssetMultipleMember" abstract="true" name="MeasurementInputAssetMultipleMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_SyndicatedFacilityMember" abstract="true" name="SyndicatedFacilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_EquitySecuritiesJVLLCMember" abstract="true" name="EquitySecuritiesJVLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_InvestmentOwnedAtCostMember" abstract="true" name="InvestmentOwnedAtCostMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_ApplicationSoftwareMember" abstract="true" name="ApplicationSoftwareMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_MultiSectorHoldingsMember" abstract="true" name="MultiSectorHoldingsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_HealthCareServicesMember" abstract="true" name="HealthCareServicesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_HealthCareEquipmentMember" abstract="true" name="HealthCareEquipmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_InteractiveMediaServicesMember" abstract="true" name="InteractiveMediaServicesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_AerospaceDefenseMember" abstract="true" name="AerospaceDefenseMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_PharmaceuticalsMember" abstract="true" name="PharmaceuticalsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_MetalGlassPlasticContainersMember" abstract="true" name="MetalGlassPlasticContainersMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_SpecializedConsumerServicesMember" abstract="true" name="SpecializedConsumerServicesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_DiversifiedSupportServicesMember" abstract="true" name="DiversifiedSupportServicesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_EnvironmentalFacilitiesServicesMember" abstract="true" name="EnvironmentalFacilitiesServicesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_HealthCareTechnologyMember" abstract="true" name="HealthCareTechnologyMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_SoftDrinksNonAlcoholicBeveragesMember" abstract="true" name="SoftDrinksNonAlcoholicBeveragesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_SpecializedFinanceMember" abstract="true" name="SpecializedFinanceMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_LifeSciencesToolsServicesMember" abstract="true" name="LifeSciencesToolsServicesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_DiversifiedFinancialServicesMember" abstract="true" name="DiversifiedFinancialServicesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_AlternativeCarriersMember" abstract="true" name="AlternativeCarriersMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_SystemsSoftwareMember" abstract="true" name="SystemsSoftwareMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_AirFreightLogisticsMember" abstract="true" name="AirFreightLogisticsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_CommunicationsEquipmentMember" abstract="true" name="CommunicationsEquipmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_DataProcessingOutsourcedServicesMember" abstract="true" name="DataProcessingOutsourcedServicesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_AutomotiveRetailMember" abstract="true" name="AutomotiveRetailMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_RealEstateOperatingCompaniesMember" abstract="true" name="RealEstateOperatingCompaniesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_PackagedFoodsMeatsMember" abstract="true" name="PackagedFoodsMeatsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_BuildingProductsMember" abstract="true" name="BuildingProductsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_CableSatelliteMember" abstract="true" name="CableSatelliteMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_AirportServicesMember" abstract="true" name="AirportServicesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_BiotechnologyMember" abstract="true" name="BiotechnologyMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_HealthCareSuppliesMember" abstract="true" name="HealthCareSuppliesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_ConstructionMachineryHeavyTransportationEquipmentMember" abstract="true" name="ConstructionMachineryHeavyTransportationEquipmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_ConstructionEngineeringMember" abstract="true" name="ConstructionEngineeringMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_PassengerGroundTransportationMember" abstract="true" name="PassengerGroundTransportationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_ElectricalComponentsEquipmentMember" abstract="true" name="ElectricalComponentsEquipmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_DrugRetailMember" abstract="true" name="DrugRetailMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_HealthCareDistributorsMember" abstract="true" name="HealthCareDistributorsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_InsuranceBrokersMember" abstract="true" name="InsuranceBrokersMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_AdvertisingIndustryMember" abstract="true" name="AdvertisingIndustryMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_RealEstateServicesMember" abstract="true" name="RealEstateServicesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_OilGasExplorationProductionMember" abstract="true" name="OilGasExplorationProductionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_HotelsResortsCruiseLinesMember" abstract="true" name="HotelsResortsCruiseLinesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_IndustrialMachinerySuppliesComponentsMember" abstract="true" name="IndustrialMachinerySuppliesComponentsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_DiversifiedChemicalsMember" abstract="true" name="DiversifiedChemicalsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_CasinosGamingMember" abstract="true" name="CasinosGamingMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_EducationServicesMember" abstract="true" name="EducationServicesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_DistillersVintnersMember" abstract="true" name="DistillersVintnersMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_OilGasStorageTransportationMember" abstract="true" name="OilGasStorageTransportationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_PropertyCasualtyInsuranceMember" abstract="true" name="PropertyCasualtyInsuranceMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_DistributorsMember" abstract="true" name="DistributorsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_OfficeServicesSuppliesMember" abstract="true" name="OfficeServicesSuppliesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_PersonalCareProductsMember" abstract="true" name="PersonalCareProductsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_ApparelRetailMember" abstract="true" name="ApparelRetailMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_ResearchConsultingServicesMember" abstract="true" name="ResearchConsultingServicesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_InternetServicesInfrastructureMember" abstract="true" name="InternetServicesInfrastructureMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_BroadlineRetailMember" abstract="true" name="BroadlineRetailMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_HousewaresSpecialtiesMember" abstract="true" name="HousewaresSpecialtiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_MoviesEntertainmentMember" abstract="true" name="MoviesEntertainmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_HomeFurnishingsMember" abstract="true" name="HomeFurnishingsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_DiversifiedRealEstateActivitiesMember" abstract="true" name="DiversifiedRealEstateActivitiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_HomeImprovementRetailMember" abstract="true" name="HomeImprovementRetailMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_Gold1Member" abstract="true" name="Gold1Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_RealEstateDevelopmentMember" abstract="true" name="RealEstateDevelopmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_PaperPlasticPackagingProductsMaterialsMember" abstract="true" name="PaperPlasticPackagingProductsMaterialsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_FinancialExchangesDataMember" abstract="true" name="FinancialExchangesDataMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_Advertising1Member" abstract="true" name="Advertising1Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_InvestmentSectorConcentrationRiskMember" abstract="true" name="InvestmentSectorConcentrationRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_A30DaySOFRMember" abstract="true" name="A30DaySOFRMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_A90DaySOFRMember" abstract="true" name="A90DaySOFRMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_A180DaySOFRMember" abstract="true" name="A180DaySOFRMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_SeniorCreditFacilityMember" abstract="true" name="SeniorCreditFacilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_FeeIncomeRecurring" abstract="false" name="FeeIncomeRecurring" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ocsl_InvestmentCompanyAccumulatedOverdistributedEarningsMember" abstract="true" name="InvestmentCompanyAccumulatedOverdistributedEarningsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_StockIssuedDuringPeriodSharesPrivatePlacement" abstract="false" name="StockIssuedDuringPeriodSharesPrivatePlacement" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="ocsl_AtTheMarketMember" abstract="true" name="AtTheMarketMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_DividendReinvestmentPlanPercentOfCurrentMarketPrice" abstract="false" name="DividendReinvestmentPlanPercentOfCurrentMarketPrice" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="ocsl_SaleOfStockMaximumAggregateOfferingAmount" abstract="false" name="SaleOfStockMaximumAggregateOfferingAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ocsl_DistributionTypeQuarterlyMember" abstract="true" name="DistributionTypeQuarterlyMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_DistributionTypeSupplementalMember" abstract="true" name="DistributionTypeSupplementalMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_InvestmentCompanyDistributionToShareholdersAndTaxReturnOfCapitalPerShare" abstract="false" name="InvestmentCompanyDistributionToShareholdersAndTaxReturnOfCapitalPerShare" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="ocsl_SaleOfStockConsiderationReceivedOnTransactionExcludingOfferingCosts" abstract="false" name="SaleOfStockConsiderationReceivedOnTransactionExcludingOfferingCosts" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ocsl_ProceedsFromIssuanceOfCommonStockNet" abstract="false" name="ProceedsFromIssuanceOfCommonStockNet" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ocsl_A2025NotesMember" abstract="true" name="A2025NotesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_LondonInterbankOfferedRateLIBOR1Member" abstract="true" name="LondonInterbankOfferedRateLIBOR1Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_DebtCovenantAxis" abstract="true" name="DebtCovenantAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="ocsl_DebtCovenantDomain" abstract="true" name="DebtCovenantDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_GreaterThan1.60xBorrowingsBaseMember" abstract="true" name="GreaterThan1.60xBorrowingsBaseMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_LineOfCreditFacilityAccordionFeatureIncreaseLimit" abstract="false" name="LineOfCreditFacilityAccordionFeatureIncreaseLimit" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ocsl_DebtInstrumentCovenantTotalAssetsToTotalIndebtednessRatio" abstract="false" name="DebtInstrumentCovenantTotalAssetsToTotalIndebtednessRatio" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="ocsl_DebtInstrumentCovenantConsolidatedEBITDAToConsolidatedInterestExpenseRatio" abstract="false" name="DebtInstrumentCovenantConsolidatedEBITDAToConsolidatedInterestExpenseRatio" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="ocsl_InterestExpenseEffectOfInterestRateSwap" abstract="false" name="InterestExpenseEffectOfInterestRateSwap" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ocsl_CapitalLossCarryforwardAxis" abstract="true" name="CapitalLossCarryforwardAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="ocsl_CapitalLossCarryforwardDomain" abstract="true" name="CapitalLossCarryforwardDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_ShortTermCapitalLossCarryforwardMember" abstract="true" name="ShortTermCapitalLossCarryforwardMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_LongTermCapitalLossCarryforwardMember" abstract="true" name="LongTermCapitalLossCarryforwardMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_IncomeTaxTaxableIncomeTypeAxis" abstract="true" name="IncomeTaxTaxableIncomeTypeAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="ocsl_IncomeTaxTaxableIncomeTypeDomain" abstract="true" name="IncomeTaxTaxableIncomeTypeDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_InvestmentIncomeExpenseNetMember" abstract="true" name="InvestmentIncomeExpenseNetMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_RealizedAndUnrealizedGainsLossesNetMember" abstract="true" name="RealizedAndUnrealizedGainsLossesNetMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_InvestmentCompanyTaxBasisCapitalGainsIncentiveFeesDifferencesIncreaseDecrease" abstract="false" name="InvestmentCompanyTaxBasisCapitalGainsIncentiveFeesDifferencesIncreaseDecrease" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ocsl_InvestmentCompanyDistributableEarningsLossAccumulatedUnrealizedGainsLosses" abstract="false" name="InvestmentCompanyDistributableEarningsLossAccumulatedUnrealizedGainsLosses" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ocsl_DominionDiagnosticsLLCMember" abstract="true" name="DominionDiagnosticsLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_MosaicCompaniesLLCMember" abstract="true" name="MosaicCompaniesLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_SpanxLLCMember" abstract="true" name="SpanxLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_AllWebLeadsIncMember" abstract="true" name="AllWebLeadsIncMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_ThrasioLLCMember" abstract="true" name="ThrasioLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_OtherNetMember" abstract="true" name="OtherNetMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_ForeignCurrencyForwardContractsMember" abstract="true" name="ForeignCurrencyForwardContractsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_Telestream2LLCMember" abstract="true" name="Telestream2LLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_AureliaNetherlandsMidcoMember" abstract="true" name="AureliaNetherlandsMidcoMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_AstraAcquisitionCorpMember" abstract="true" name="AstraAcquisitionCorpMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_LABLInc.Member" abstract="true" name="LABLInc.Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_AthenahealthInc.Member" abstract="true" name="AthenahealthInc.Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_SVPSingerHoldingsInc.Member" abstract="true" name="SVPSingerHoldingsInc.Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_FinThriveSoftwareIntermediateHoldingsIncMember" abstract="true" name="FinThriveSoftwareIntermediateHoldingsIncMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_ExitedInvestmentsMember" abstract="true" name="ExitedInvestmentsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_OaktreeStrategicIncomeCorporationMergerMember" abstract="true" name="OaktreeStrategicIncomeCorporationMergerMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_OaktreeStrategicIncomeIIIncMergerMember" abstract="true" name="OaktreeStrategicIncomeIIIncMergerMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_OaktreeStrategicIncomeIIIncMergerYearOneMember" abstract="true" name="OaktreeStrategicIncomeIIIncMergerYearOneMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_OaktreeStrategicIncomeIIIncMergerYearTwoMember" abstract="true" name="OaktreeStrategicIncomeIIIncMergerYearTwoMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_InvestmentAdvisoryAgreementMember" abstract="true" name="InvestmentAdvisoryAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_InvestmentAdvisoryAgreementIncentiveRatePreIncentiveFeeNetInvestmentIncomeBelowCatchUpMember" abstract="true" name="InvestmentAdvisoryAgreementIncentiveRatePreIncentiveFeeNetInvestmentIncomeBelowCatchUpMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_InvestmentAdvisoryAgreementIncentiveRateQuarterlyCatchUpThresholdMember" abstract="true" name="InvestmentAdvisoryAgreementIncentiveRateQuarterlyCatchUpThresholdMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_InvestmentAdvisoryAgreementIncentiveRatePreIncentiveFeeNetInvestmentIncomeExceedsCatchUpThresholdMember" abstract="true" name="InvestmentAdvisoryAgreementIncentiveRatePreIncentiveFeeNetInvestmentIncomeExceedsCatchUpThresholdMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_InvestmentAdvisoryAgreementIncentiveRateRealizedCapitalGainsMember" abstract="true" name="InvestmentAdvisoryAgreementIncentiveRateRealizedCapitalGainsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_InvestmentAdvisoryAgreementIncentiveRateAnnualizedThresholdMember" abstract="true" name="InvestmentAdvisoryAgreementIncentiveRateAnnualizedThresholdMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_ManagementAndIncentiveFeePayable" abstract="false" name="ManagementAndIncentiveFeePayable" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ocsl_RelatedPartyTransactionNumberOfComponents" abstract="false" name="RelatedPartyTransactionNumberOfComponents" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="ocsl_RelatedPartyTransactionTerminationNoticePeriod" abstract="false" name="RelatedPartyTransactionTerminationNoticePeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="ocsl_ManagementAndServiceFeesNetAssetValuePercentageThreshold" abstract="false" name="ManagementAndServiceFeesNetAssetValuePercentageThreshold" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="ocsl_ManagementAndServiceFeesInvestmentsPercentageThreshold" abstract="false" name="ManagementAndServiceFeesInvestmentsPercentageThreshold" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="ocsl_InvestmentCompanyContractualFeeWaivedPeriod" abstract="false" name="InvestmentCompanyContractualFeeWaivedPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="ocsl_InvestmentCompanyContractualFeeWaivedPerQuarter" abstract="false" name="InvestmentCompanyContractualFeeWaivedPerQuarter" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ocsl_InvestmentCompanyDistributionToShareholdersIncludesForeignExchangeDerivativePerShare" abstract="false" name="InvestmentCompanyDistributionToShareholdersIncludesForeignExchangeDerivativePerShare" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="ocsl_InvestmentCompanyExpenseRatioTotalExpenses" abstract="false" name="InvestmentCompanyExpenseRatioTotalExpenses" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="ocsl_InvestmentCompanyExpenseRatioNetExpenses" abstract="false" name="InvestmentCompanyExpenseRatioNetExpenses" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="ocsl_InvestmentCompanyPortfolioTurnoverRatio" abstract="false" name="InvestmentCompanyPortfolioTurnoverRatio" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="ocsl_InvestmentCompanyAverageLongTermDebtOutstandingPerShare" abstract="false" name="InvestmentCompanyAverageLongTermDebtOutstandingPerShare" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="ocsl_DebtAndEquityFinancingMember" abstract="true" name="DebtAndEquityFinancingMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_JVFinancingMember" abstract="true" name="JVFinancingMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_InvestmentCompanyFinancialSupportToInvesteeContractuallyRequiredAmountWhichCanBeDrawnImmediately" abstract="false" name="InvestmentCompanyFinancialSupportToInvesteeContractuallyRequiredAmountWhichCanBeDrawnImmediately" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ocsl_DistributionTypeSupplementalDistributionsMember" abstract="true" name="DistributionTypeSupplementalDistributionsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_InvestmentAffiliatedIssuerControlAndAffiliateMember" abstract="true" name="InvestmentAffiliatedIssuerControlAndAffiliateMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ocsl_OSI2CitibankFacilityMember" abstract="true" name="OSI2CitibankFacilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
</xs:schema>
