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          <ccc>XXXXXXXX</ccc>
        </issuerCredentials>
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        <classId>C000023775</classId>
        <classId>C000099328</classId>
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      <regFileNumber>811-03334</regFileNumber>
      <regCik>0000356682</regCik>
      <regLei>549300V0NY9G3Y5OI796</regLei>
      <regStreet1>2050 M Street NW</regStreet1>
      <regStreet2>SUITE 1000 N</regStreet2>
      <regCity>Washington</regCity>
      <regStateConditional regCountry="US" regState="US-DC"/>
      <regZipOrPostalCode>20036</regZipOrPostalCode>
      <regPhone>202-238-2200</regPhone>
      <seriesName>Calvert Growth Allocation Fund</seriesName>
      <seriesId>S000008723</seriesId>
      <seriesLei>549300UGXJ3LMFVD6U44</seriesLei>
      <repPdEnd>2026-09-30</repPdEnd>
      <repPdDate>2026-06-30</repPdDate>
      <isFinalFiling>N</isFinalFiling>
    </genInfo>
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      <totLiabs>296479.73</totLiabs>
      <netAssets>391290571.32</netAssets>
      <assetsAttrMiscSec>0.00000000</assetsAttrMiscSec>
      <assetsInvested>0.00000000</assetsInvested>
      <amtPayOneYrBanksBorr>0.00000000</amtPayOneYrBanksBorr>
      <amtPayOneYrCtrldComp>0.00000000</amtPayOneYrCtrldComp>
      <amtPayOneYrOthAffil>0.00000000</amtPayOneYrOthAffil>
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      <amtPayAftOneYrBanksBorr>0.00000000</amtPayAftOneYrBanksBorr>
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      <standByCommit>0.00000000</standByCommit>
      <liquidPref>0.00000000</liquidPref>
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          <interestRtContracts>
            <mon1 netRealizedGain="0.00000000" netUnrealizedAppr="0.00000000"/>
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      <varInfo>

        <fundsDesignatedInfo>
          <nameDesignatedIndex>60% Russell 3000 / 30% MSCI ACWI ex USA IMI / 10% Bloomberg US Agg</nameDesignatedIndex>
          <indexIdentifier>RSMSLAUSD</indexIdentifier>

        </fundsDesignatedInfo>

      </varInfo>
    </fundInfo>
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      <invstOrSec>
        <name>Calvert Mortgage Access Fund</name>
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        <title>Calvert Mortgage Access Fund</title>
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          <isin value="US1315822312"/>
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        <balance>379625.97000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
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        <payoffProfile>Long</payoffProfile>
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        <issuerCat>RF</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
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      </invstOrSec>
      <invstOrSec>
        <name>Calvert High Yield Bond Fund</name>
        <lei>549300CCIV46L1T22Z08</lei>
        <title>Calvert High Yield Bond Fund</title>
        <cusip>131582272</cusip>
        <identifiers>
          <isin value="US1315822726"/>
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        <balance>80702.52000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
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        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
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        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
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      </invstOrSec>
      <invstOrSec>
        <name>Calvert Equity Fund</name>
        <lei>5493008KHIQHXPKPLB89</lei>
        <title>Calvert Equity Fund</title>
        <cusip>131582280</cusip>
        <identifiers>
          <isin value="US1315822809"/>
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        <balance>305683.58000000</balance>
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        <curCd>USD</curCd>
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        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
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        <invCountry>US</invCountry>
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        <fairValLevel>1</fairValLevel>
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          <isCashCollateral>N</isCashCollateral>
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          <isLoanByFund>N</isLoanByFund>
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      </invstOrSec>
      <invstOrSec>
        <name>Calvert US Large Cap Core Responsible Index Fund</name>
        <lei>549300PO0F0AV64IR605</lei>
        <title>Calvert US Large Cap Core Responsible Index Fund</title>
        <cusip>131582298</cusip>
        <identifiers>
          <isin value="US1315822981"/>
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        <balance>1328487.52000000</balance>
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        <curCd>USD</curCd>
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        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
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        <invCountry>US</invCountry>
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        <fairValLevel>1</fairValLevel>
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          <isCashCollateral>N</isCashCollateral>
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      <invstOrSec>
        <name>Calvert Bond Fund</name>
        <lei>549300T75TF7NTCFI791</lei>
        <title>Calvert Bond Fund</title>
        <cusip>131582322</cusip>
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          <isin value="US1315823229"/>
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        <balance>1290372.82000000</balance>
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        <payoffProfile>Long</payoffProfile>
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        <invCountry>US</invCountry>
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        <fairValLevel>1</fairValLevel>
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          <isCashCollateral>N</isCashCollateral>
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          <isLoanByFund>N</isLoanByFund>
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      <invstOrSec>
        <name>Calvert Core Bond Fund</name>
        <lei>549300HEFY2HHDRM0E11</lei>
        <title>Calvert Core Bond Fund</title>
        <cusip>131582330</cusip>
        <identifiers>
          <isin value="US1315823302"/>
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        <balance>620905.19000000</balance>
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        <curCd>USD</curCd>
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        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
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        <invCountry>US</invCountry>
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        <fairValLevel>1</fairValLevel>
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          <isCashCollateral>N</isCashCollateral>
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          <isLoanByFund>N</isLoanByFund>
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      </invstOrSec>
      <invstOrSec>
        <name>Calvert US Mid Cap Core Responsible Index Fund</name>
        <lei>549300I74Z158YTBPO44</lei>
        <title>Calvert US Mid Cap Core Responsible Index Fund</title>
        <cusip>131618456</cusip>
        <identifiers>
          <isin value="US1316184563"/>
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        <balance>96873.78000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
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        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</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>Calvert US Large Cap Value Responsible Index Fund</name>
        <lei>5493005WGBW1GHF4CG37</lei>
        <title>Calvert US Large Cap Value Responsible Index Fund</title>
        <cusip>131618464</cusip>
        <identifiers>
          <isin value="US1316184647"/>
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        <balance>852409.60000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>35144847.89000000</valUSD>
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        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>RF</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
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          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Calvert US Large Cap Growth Responsible Index Fund</name>
        <lei>5493000179G37BJVLO31</lei>
        <title>Calvert US Large Cap Growth Responsible Index Fund</title>
        <cusip>131618472</cusip>
        <identifiers>
          <isin value="US1316184720"/>
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        <balance>1068072.17000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>88457737.12000000</valUSD>
        <pctVal>22.60666205720</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</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>Calvert Small Cap Fund</name>
        <lei>549300MIJR64EECJ6M85</lei>
        <title>Calvert Small Cap Fund</title>
        <cusip>13161P672</cusip>
        <identifiers>
          <isin value="US13161P6723"/>
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        <balance>241564.62000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>8157637.12000000</valUSD>
        <pctVal>2.084802885099</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</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>Calvert Small/Mid-Cap Fund</name>
        <lei>549300085L1NSA5LCU34</lei>
        <title>Calvert Small/Mid-Cap Fund</title>
        <cusip>13161X717</cusip>
        <identifiers>
          <isin value="US13161X7176"/>
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        <balance>113377.92000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>3022655.21000000</valUSD>
        <pctVal>0.772483527983</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</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>Calvert International Responsible Index Fund</name>
        <lei>5493002R7L7YSTUULM88</lei>
        <title>Calvert International Responsible Index Fund</title>
        <cusip>13161Y848</cusip>
        <identifiers>
          <isin value="US13161Y8488"/>
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        <balance>1305397.91000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>59382550.83000000</valUSD>
        <pctVal>15.17607506607</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</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>Calvert Emerging Markets Advancement Fund</name>
        <lei>549300OOWWGW13TF0P06</lei>
        <title>Calvert Emerging Markets Advancement Fund</title>
        <cusip>131649717</cusip>
        <identifiers>
          <isin value="US1316497171"/>
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        <balance>1192172.90000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>23271215.09000000</valUSD>
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        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</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>Calvert International Equity Fund</name>
        <lei>549300DYXGATLWKZ1990</lei>
        <title>Calvert International Equity Fund</title>
        <cusip>131649741</cusip>
        <identifiers>
          <isin value="US1316497411"/>
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        <balance>402522.75000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>11954925.68000000</valUSD>
        <pctVal>3.055255239008</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</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>Calvert International Opportunities Fund</name>
        <lei>549300125QOYCBC7IB51</lei>
        <title>Calvert International Opportunities Fund</title>
        <cusip>131649758</cusip>
        <identifiers>
          <isin value="US1316497585"/>
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        <balance>1248.91000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>23392.10000000</valUSD>
        <pctVal>0.005978191583</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</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>Calvert Emerging Markets Equity Fund</name>
        <lei>549300L4S5NY62FOKA38</lei>
        <title>Calvert Emerging Markets Equity Fund</title>
        <cusip>131649766</cusip>
        <identifiers>
          <isin value="US1316497668"/>
        </identifiers>
        <balance>317952.22000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>9602157.01000000</valUSD>
        <pctVal>2.453970965261</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</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>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>6469629.68000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>6469629.68000000</valUSD>
        <pctVal>1.653408018029</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>
    </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>2026-07-27</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>
  <documents>XXXX</documents>
</edgarSubmission>
