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        <pctVal>1.011219104150</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 Absolute Return Bond Fund</name>
        <lei>549300HDLJYKTU171023</lei>
        <title>Calvert Absolute Return Bond Fund</title>
        <cusip>13161X840</cusip>
        <identifiers>
          <isin value="US13161X8406"/>
        </identifiers>
        <balance>1394873.45800000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>21076537.95000000</valUSD>
        <pctVal>6.046527303063</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 Bond Fund</name>
        <lei>549300T75TF7NTCFI791</lei>
        <title>Calvert Bond Fund</title>
        <cusip>131582322</cusip>
        <identifiers>
          <isin value="US1315823229"/>
        </identifiers>
        <balance>1833060.22600000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>30208832.52000000</valUSD>
        <pctVal>8.666439007164</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>Chicago Board of Trade</name>
        <lei>549300EX04Q2QBFQTQ27</lei>
        <title>US 10YR NOTE (CBT)MAR20 XCBT 20200320</title>
        <cusip>000000000</cusip>
        <identifiers>
          <other otherDesc="Internal Identifier" value="ADI1CT4X8"/>
        </identifiers>
        <balance>58.00000000</balance>
        <units>NC</units>
        <curCd>USD</curCd>
        <valUSD>-77163.49000000</valUSD>
        <pctVal>-0.02213699186</pctVal>
        <payoffProfile>N/A</payoffProfile>
        <assetCat>DIR</assetCat>
        <issuerConditional desc="derivative" issuerCat="OTHER"/>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <derivativeInfo>
          <futrDeriv derivCat="FUT">
            <counterparties>
              <counterpartyName>Chicago Board of Trade</counterpartyName>
              <counterpartyLei>549300EX04Q2QBFQTQ27</counterpartyLei>
            </counterparties>
            <payOffProf>Long</payOffProf>
            <descRefInstrmnt>
              <indexBasketInfo>
                <indexName>10 Year US Treasury Note</indexName>
                <indexIdentifier>TYH0 Comdty</indexIdentifier>
              </indexBasketInfo>
            </descRefInstrmnt>
            <expDate>2020-03-20</expDate>
            <notionalAmt>7525632.24</notionalAmt>
            <curCd>USD</curCd>
            <unrealizedAppr>-77163.49</unrealizedAppr>
          </futrDeriv>
        </derivativeInfo>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>United States Treasury</name>
        <lei>254900HROIFWPRGM1V77</lei>
        <title>United States Treasury Inflation Indexed Bonds</title>
        <cusip>9128285W6</cusip>
        <identifiers>
          <isin value="US9128285W63"/>
        </identifiers>
        <balance>6934024.44000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>7365647.63000000</valUSD>
        <pctVal>2.113088478060</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>DBT</assetCat>
        <issuerCat>UST</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2029-01-15</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>0.88000000</annualizedRt>
          <isDefault>N</isDefault>
          <areIntrstPmntsInArrs>N</areIntrstPmntsInArrs>
          <isPaidKind>N</isPaidKind>
        </debtSec>
        <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"/>
        </identifiers>
        <balance>1225314.17100000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>21626795.12000000</valUSD>
        <pctVal>6.204387432179</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>United States Treasury</name>
        <lei>254900HROIFWPRGM1V77</lei>
        <title>United States Treasury Inflation Indexed Bonds</title>
        <cusip>9128284H0</cusip>
        <identifiers>
          <isin value="US9128284H06"/>
        </identifiers>
        <balance>4555160.09000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>4626201.00000000</valUSD>
        <pctVal>1.327184318521</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>DBT</assetCat>
        <issuerCat>UST</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2023-04-15</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>0.63000000</annualizedRt>
          <isDefault>N</isDefault>
          <areIntrstPmntsInArrs>N</areIntrstPmntsInArrs>
          <isPaidKind>N</isPaidKind>
        </debtSec>
        <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"/>
        </identifiers>
        <balance>909918.32600000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>19344863.61000000</valUSD>
        <pctVal>5.549737166008</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>Chicago Board of Trade</name>
        <lei>549300EX04Q2QBFQTQ27</lei>
        <title>US ULTRA BOND CBT MAR20 XCBT 20200320</title>
        <cusip>000000000</cusip>
        <identifiers>
          <other otherDesc="Internal Identifier" value="ADI1CTD83"/>
        </identifiers>
        <balance>-7.00000000</balance>
        <units>NC</units>
        <curCd>USD</curCd>
        <valUSD>49373.22000000</valUSD>
        <pctVal>0.014164400409</pctVal>
        <payoffProfile>N/A</payoffProfile>
        <assetCat>DIR</assetCat>
        <issuerConditional desc="derivative" issuerCat="OTHER"/>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <derivativeInfo>
          <futrDeriv derivCat="FUT">
            <counterparties>
              <counterpartyName>Chicago Board of Trade</counterpartyName>
              <counterpartyLei>549300EX04Q2QBFQTQ27</counterpartyLei>
            </counterparties>
            <payOffProf>Short</payOffProf>
            <descRefInstrmnt>
              <indexBasketInfo>
                <indexName>US Treasury Ultra Long Bond</indexName>
                <indexIdentifier>WNH0 Comdty</indexIdentifier>
              </indexBasketInfo>
            </descRefInstrmnt>
            <expDate>2020-03-20</expDate>
            <notionalAmt>-1320966.97</notionalAmt>
            <curCd>USD</curCd>
            <unrealizedAppr>49373.22</unrealizedAppr>
          </futrDeriv>
        </derivativeInfo>
        <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"/>
        </identifiers>
        <balance>305142.78200000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>8580615.03000000</valUSD>
        <pctVal>2.461643519398</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 US Large Cap Value Responsible Index Fund</name>
        <lei>5493005WGBW1GHF4CG37</lei>
        <title>Calvert US Large Cap Value Responsible Index Fund</title>
        <cusip>13162A708</cusip>
        <identifiers>
          <isin value="US13162A7081"/>
        </identifiers>
        <balance>1718345.03400000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>42907075.50000000</valUSD>
        <pctVal>12.30936523450</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>
    </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>2020-01-24</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>
