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      <regStreet1>1825 Connecticut Avenue NW,</regStreet1>
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      <regCity>Washington</regCity>
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      <regZipOrPostalCode>20009</regZipOrPostalCode>
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      <repPdEnd>2023-09-30</repPdEnd>
      <repPdDate>2023-09-30</repPdDate>
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          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Charles Schwab Corp/The</name>
        <lei>549300VSGCJ7E698NM85</lei>
        <title>Charles Schwab Corp/The</title>
        <cusip>808513105</cusip>
        <identifiers>
          <isin value="US8085131055"/>
        </identifiers>
        <balance>24833.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>1363331.70000000</valUSD>
        <pctVal>2.542938208305</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Morgan Stanley &amp; Co. LLC</name>
        <lei>549300BI6Y5SI6BYPB26</lei>
        <title>Morgan Stanley Institutional Liquidity Funds - Government Portfolio</title>
        <cusip>61747C707</cusip>
        <identifiers>
          <isin value="US61747C7074"/>
        </identifiers>
        <balance>1316739.29000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>1316739.29000000</valUSD>
        <pctVal>2.456032270736</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>STIV</assetCat>
        <issuerCat>RF</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Sanofi</name>
        <lei>549300E9PC51EN656011</lei>
        <title>Sanofi</title>
        <cusip>000000000</cusip>
        <identifiers>
          <isin value="FR0000120578"/>
        </identifiers>
        <balance>18450.00000000</balance>
        <units>NS</units>
        <currencyConditional curCd="EUR" exchangeRt="0.94585000"/>
        <valUSD>1981073.34000000</valUSD>
        <pctVal>3.695173441460</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>FR</invCountry>

        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Humana Inc</name>
        <lei>529900YLDW34GJAO4J06</lei>
        <title>Humana Inc</title>
        <cusip>444859102</cusip>
        <identifiers>
          <isin value="US4448591028"/>
        </identifiers>
        <balance>3818.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>1857533.36000000</valUSD>
        <pctVal>3.464741965836</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Cboe Global Markets Inc</name>
        <lei>529900RLNSGA90UPEH54</lei>
        <title>Cboe Global Markets Inc</title>
        <cusip>12503M108</cusip>
        <identifiers>
          <isin value="US12503M1080"/>
        </identifiers>
        <balance>10010.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>1563662.10000000</valUSD>
        <pctVal>2.916602099818</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Mid-America Apartment Communities Inc</name>
        <lei>549300FQZKFR5YNSHZ21</lei>
        <title>Mid-America Apartment Communities Inc</title>
        <cusip>59522J103</cusip>
        <identifiers>
          <isin value="US59522J1034"/>
        </identifiers>
        <balance>17485.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>2249445.25000000</valUSD>
        <pctVal>4.195750948735</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerConditional desc="REIT" issuerCat="OTHER"/>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Westinghouse Air Brake Technologies Corp</name>
        <lei>06BTX5UWZD0GQ5N5Y745</lei>
        <title>Westinghouse Air Brake Technologies Corp</title>
        <cusip>929740108</cusip>
        <identifiers>
          <isin value="US9297401088"/>
        </identifiers>
        <balance>17507.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>1860468.89000000</valUSD>
        <pctVal>3.470217428190</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Bristol-Myers Squibb Co</name>
        <lei>HLYYNH7UQUORYSJQCN42</lei>
        <title>Bristol-Myers Squibb Co</title>
        <cusip>110122108</cusip>
        <identifiers>
          <isin value="US1101221083"/>
        </identifiers>
        <balance>42215.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>2450158.60000000</valUSD>
        <pctVal>4.570129133172</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>American International Group Inc</name>
        <lei>ODVCVCQG2BP6VHV36M30</lei>
        <title>American International Group Inc</title>
        <cusip>026874784</cusip>
        <identifiers>
          <isin value="US0268747849"/>
        </identifiers>
        <balance>43168.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>2615980.80000000</valUSD>
        <pctVal>4.879427015826</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
    </invstOrSecs>
    <explntrNotes>
      <explntrNote note="Monthly returns presented in Item B.5(a) have been calculated without deducting any applicable sales loads or redemption fees." noteItem="B.5.a"/>
    </explntrNotes>
    <signature>
      <ncom:dateSigned>2023-10-25</ncom:dateSigned>
      <ncom:nameOfApplicant>CALVERT SOCIAL INVESTMENT FUND</ncom:nameOfApplicant>
      <ncom:signature>James Kirchner</ncom:signature>
      <ncom:signerName>James Kirchner</ncom:signerName>
      <ncom:title>Treasurer</ncom:title>
    </signature>
  </formData>
</edgarSubmission>
