<?xml version="1.0" encoding="UTF-8"?><edgarSubmission xmlns="http://www.sec.gov/edgar/nport" xmlns:com="http://www.sec.gov/edgar/common" xmlns:ncom="http://www.sec.gov/edgar/nportcommon" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.sec.gov/edgar/nport eis_NPORT_Filer.xsd">
  <headerData>
    <submissionType>NPORT-P</submissionType>
    <isConfidential>false</isConfidential>
    <filerInfo>

      <filer>
        <issuerCredentials>
          <cik>0000742212</cik>
          <ccc>XXXXXXXX</ccc>
        </issuerCredentials>
      </filer>


      <seriesClassInfo>
        <seriesId>S000000044</seriesId>
        <classId>C000000079</classId>
      </seriesClassInfo>


    </filerInfo>
  </headerData>
  <formData>
    <genInfo>
      <regName>NORTHWESTERN MUTUAL SERIES FUND INC</regName>
      <regFileNumber>811-03990</regFileNumber>
      <regCik>0000742212</regCik>
      <regLei>549300T1UBX7MDSNZA55</regLei>
      <regStreet1>720 E WISCONSIN AVE</regStreet1>
      <regCity>MILWAUKEE</regCity>
      <regStateConditional regCountry="US" regState="US-WI"/>
      <regZipOrPostalCode>53202</regZipOrPostalCode>
      <regPhone>414-271-1444</regPhone>
      <seriesName>Asset Allocation Portfolio</seriesName>
      <seriesId>S000000044</seriesId>
      <seriesLei>5DD2LVSRPBY8KFA02K39</seriesLei>
      <repPdEnd>2025-12-31</repPdEnd>
      <repPdDate>2025-03-31</repPdDate>
      <isFinalFiling>N</isFinalFiling>
    </genInfo>
    <fundInfo>
      <totAssets>267413829.29</totAssets>
      <totLiabs>72832.96</totLiabs>
      <netAssets>267340996.33</netAssets>
      <assetsAttrMiscSec>0.00000000</assetsAttrMiscSec>
      <assetsInvested>0.00000000</assetsInvested>
      <amtPayOneYrBanksBorr>0.00000000</amtPayOneYrBanksBorr>
      <amtPayOneYrCtrldComp>0.00000000</amtPayOneYrCtrldComp>
      <amtPayOneYrOthAffil>0.00000000</amtPayOneYrOthAffil>
      <amtPayOneYrOther>0.00000000</amtPayOneYrOther>
      <amtPayAftOneYrBanksBorr>0.00000000</amtPayAftOneYrBanksBorr>
      <amtPayAftOneYrCtrldComp>0.00000000</amtPayAftOneYrCtrldComp>
      <amtPayAftOneYrOthAffil>0.00000000</amtPayAftOneYrOthAffil>
      <amtPayAftOneYrOther>0.00000000</amtPayAftOneYrOther>
      <delayDeliv>0.00000000</delayDeliv>
      <standByCommit>0.00000000</standByCommit>
      <liquidPref>0.00000000</liquidPref>
      <cshNotRptdInCorD>4820077.87000000</cshNotRptdInCorD>
      <isNonCashCollateral>N</isNonCashCollateral>
      <returnInfo>
        <monthlyTotReturns>
          <monthlyTotReturn classId="C000000079" rtn1="2.50000000" rtn2="0.26000000" rtn3="-2.43000000"/>
        </monthlyTotReturns>
        <monthlyReturnCats>
          <commodityContracts>
            <mon1 netRealizedGain="22474.12000000" netUnrealizedAppr="205355.92000000"/>
            <mon2 netRealizedGain="227830.04000000" netUnrealizedAppr="-213182.96000000"/>
            <mon3 netRealizedGain="14647.08000000" netUnrealizedAppr="213257.16000000"/>
            <swapCategory>
              <instrMon1 netRealizedGain="22474.12000000" netUnrealizedAppr="205355.92000000"/>
              <instrMon2 netRealizedGain="227830.04000000" netUnrealizedAppr="-213182.96000000"/>
              <instrMon3 netRealizedGain="14647.08000000" netUnrealizedAppr="213257.16000000"/>
            </swapCategory>
          </commodityContracts>
          <equityContracts>
            <mon1 netRealizedGain="0.00000000" netUnrealizedAppr="0.00000000"/>
            <mon2 netRealizedGain="0.00000000" netUnrealizedAppr="0.00000000"/>
            <mon3 netRealizedGain="0.00000000" netUnrealizedAppr="0.00000000"/>
            <futureCategory>
              <instrMon1 netRealizedGain="0.00000000" netUnrealizedAppr="0.00000000"/>
              <instrMon2 netRealizedGain="0.00000000" netUnrealizedAppr="0.00000000"/>
              <instrMon3 netRealizedGain="0.00000000" netUnrealizedAppr="0.00000000"/>
            </futureCategory>
          </equityContracts>
        </monthlyReturnCats>
        <othMon1 netRealizedGain="398970.51000000" netUnrealizedAppr="6153866.36000000"/>
        <othMon2 netRealizedGain="1227894.46000000" netUnrealizedAppr="-678858.62000000"/>
        <othMon3 netRealizedGain="294297.43000000" netUnrealizedAppr="-7443423.29000000"/>
      </returnInfo>
      <mon1Flow redemption="2982824.93000000" reinvestment="0.00000000" sales="642160.52000000"/>
      <mon2Flow redemption="3460458.73000000" reinvestment="0.00000000" sales="1217367.67000000"/>
      <mon3Flow redemption="3454941.99000000" reinvestment="0.00000000" sales="1610742.13000000"/>

      <varInfo>

        <fundsDesignatedInfo>
          <nameDesignatedIndex>Asset Allocation Portfolio Blended Composite Benchmark</nameDesignatedIndex>
          <indexIdentifier>SPXT, SPTRMDCP, SPTRSMCP, NDDUEAFE, NDUEEGF, DWRTFT, BCOMTR, LBUSTRUU, G0O1</indexIdentifier>

        </fundsDesignatedInfo>

      </varInfo>
    </fundInfo>
    <invstOrSecs>
      <invstOrSec>
        <name>JPMorgan Ultra-Short Income ETF</name>
        <lei>549300VN24B8TQAGGX74</lei>
        <title>JPMorgan Ultra-Short Income ETF</title>
        <cusip>46641Q837</cusip>
        <identifiers>
          <isin value="US46641Q8371"/>
        </identifiers>
        <balance>28100.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>1422703.00000000</valUSD>
        <pctVal>0.532167912714</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>Northwestern Mutual Series Fund, Inc. - International Growth Portfolio</name>
        <lei>A7EFFZCFPQNSS1P3HZ68</lei>
        <title>International Growth Portfolio</title>
        <cusip>668140684</cusip>
        <identifiers>
          <isin value="US6681406848"/>
        </identifiers>
        <balance>7423200.42000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>14690513.63000000</valUSD>
        <pctVal>5.495047086555</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>Northwestern Mutual Series Fund, Inc. - Domestic Equity Portfolio</name>
        <lei>5493004TKKI7X6F71K84</lei>
        <title>DOMESTIC EQUITY PORTFOLIO</title>
        <cusip>668140791</cusip>
        <identifiers>
          <isin value="US6681407911"/>
        </identifiers>
        <balance>7232245.99000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>11058104.12000000</valUSD>
        <pctVal>4.136329359059</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>Northwestern Mutual Series Fund, Inc. - Focused Appreciation Portfolio</name>
        <lei>5493007QO6Z6UMWHLZ04</lei>
        <title>FOCUSED APPRECIATION PORTFOLIO</title>
        <cusip>668140775</cusip>
        <identifiers>
          <isin value="US6681407754"/>
        </identifiers>
        <balance>2302269.29000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>9895153.41000000</valUSD>
        <pctVal>3.701322859508</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>iShares Core U.S. Aggregate Bond ETF</name>
        <lei>549300F7VSXTKBGHJE47</lei>
        <title>iShares Core U.S. Aggregate Bond ETF</title>
        <cusip>464287226</cusip>
        <identifiers>
          <isin value="US4642872265"/>
        </identifiers>
        <balance>212100.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>20980932.00000000</valUSD>
        <pctVal>7.848003967974</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>Schwab U.S. REIT ETF</name>
        <lei>549300OLDKO120DR6467</lei>
        <title>Schwab U.S. REIT ETF</title>
        <cusip>808524847</cusip>
        <identifiers>
          <isin value="US8085248479"/>
        </identifiers>
        <balance>188900.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>4063239.00000000</valUSD>
        <pctVal>1.519871271439</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>Northwestern Mutual Series Fund, Inc. - Select Bond Portfolio</name>
        <lei>03DZ35VFRGD62UKLL347</lei>
        <title>Select Bond Portfolio</title>
        <cusip>668140759</cusip>
        <identifiers>
          <isin value="US6681407598"/>
        </identifiers>
        <balance>44150624.09000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>49095493.99000000</valUSD>
        <pctVal>18.36437159432</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>abrdn Bloomberg All Commodity Strategy K-1 Free ETF</name>
        <lei>549300PWXO8WGDSMS419</lei>
        <title>abrdn Bloomberg All Commodity Strategy K-1 Free ETF</title>
        <cusip>003261104</cusip>
        <identifiers>
          <isin value="US0032611040"/>
        </identifiers>
        <balance>46500.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>997890.00000000</valUSD>
        <pctVal>0.373264861618</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>Northwestern Mutual Series Fund, Inc. - Multi-Sector Bond Portfolio</name>
        <lei>P0C14V6IL3O47L1ZG636</lei>
        <title>PIMCO MULTI SECTOR BD PORT MUTUAL FUND</title>
        <cusip>668140882</cusip>
        <identifiers>
          <isin value="US6681408828"/>
        </identifiers>
        <balance>13866939.37000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>13922407.12000000</valUSD>
        <pctVal>5.207733685115</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>Northwestern Mutual Series Fund, Inc. - International Equity Portfolio</name>
        <lei>5493009J2EF7GK480170</lei>
        <title>International Equity Portfolio</title>
        <cusip>668140692</cusip>
        <identifiers>
          <isin value="US6681406921"/>
        </identifiers>
        <balance>9103148.69000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>15921407.06000000</valUSD>
        <pctVal>5.955467840161</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>SPDR Portfolio Long Term Treasury ETF</name>
        <lei>549300GYQKAMF6JUVI06</lei>
        <title>SPDR Portfolio Long Term Treasury ETF</title>
        <cusip>78464A664</cusip>
        <identifiers>
          <isin value="US78464A6644"/>
        </identifiers>
        <balance>210600.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>5740956.00000000</valUSD>
        <pctVal>2.147428220441</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>Invesco S&amp;P 500 Equal Weight ETF</name>
        <lei>549300F8VBQFIX481R47</lei>
        <title>Invesco S&amp;P 500 Equal Weight ETF</title>
        <cusip>46137V357</cusip>
        <identifiers>
          <isin value="US46137V3574"/>
        </identifiers>
        <balance>26700.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>4625241.00000000</valUSD>
        <pctVal>1.730090432628</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>iShares Core S&amp;P Small-Cap ETF</name>
        <lei>549300BZQ17QYN750B25</lei>
        <title>iShares Core S&amp;P Small-Cap ETF</title>
        <cusip>464287804</cusip>
        <identifiers>
          <isin value="US4642878049"/>
        </identifiers>
        <balance>2800.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>292796.00000000</valUSD>
        <pctVal>0.109521548890</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>SPDR Portfolio S&amp;P 400 Mid Cap ETF</name>
        <lei>549300TKUU0ZLRVSLJ96</lei>
        <title>SPDR Portfolio S&amp;P 400 Mid Cap ETF</title>
        <cusip>78464A847</cusip>
        <identifiers>
          <isin value="US78464A8475"/>
        </identifiers>
        <balance>170400.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>8721072.00000000</valUSD>
        <pctVal>3.262152875810</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>Northwestern Mutual Series Fund, Inc. - Short-Term Bond Portfolio.</name>
        <lei>BEEDB5U9NNUVQYFFEL15</lei>
        <title>Short Term Bond Portolio</title>
        <cusip>668140601</cusip>
        <identifiers>
          <isin value="US6681406012"/>
        </identifiers>
        <balance>2769198.69000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>2918735.42000000</valUSD>
        <pctVal>1.091764996789</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>Northwestern Mutual Series Fund, Inc. - Mid Cap Value Portfolio</name>
        <lei>8TRVIGMWHSWZVXP7PI34</lei>
        <title>MID CAP VALUE PORTFOLIO</title>
        <cusip>668140783</cusip>
        <identifiers>
          <isin value="US6681407838"/>
        </identifiers>
        <balance>4103540.57000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>6409730.37000000</valUSD>
        <pctVal>2.397586026083</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>Northwestern Mutual Series Fund, Inc. - Emerging Markets Equity Portfolio</name>
        <lei>549300B2SFS01R9MCJ10</lei>
        <title>MFS EMERGING MKTS PORT</title>
        <cusip>668140502</cusip>
        <identifiers>
          <isin value="US6681405022"/>
        </identifiers>
        <balance>10867360.61000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>10497870.35000000</valUSD>
        <pctVal>3.926771611579</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>U.S. Treasury Bills</title>
        <cusip>912797NN3</cusip>
        <identifiers>
          <isin value="US912797NN35"/>
        </identifiers>
        <balance>2000000.00000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>1986346.48000000</valUSD>
        <pctVal>0.743001076253</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>STIV</assetCat>
        <issuerCat>UST</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2025-05-29</maturityDt>
          <couponKind>None</couponKind>
          <annualizedRt>0.00000000</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>SPDR Dow Jones REIT ETF</name>
        <lei>54930077YVRJPO64VF50</lei>
        <title>SPDR Dow Jones REIT ETF</title>
        <cusip>78464A607</cusip>
        <identifiers>
          <isin value="US78464A6073"/>
        </identifiers>
        <balance>40700.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>4034184.00000000</valUSD>
        <pctVal>1.509003129104</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>U.S. Treasury Bills</title>
        <cusip>912797PB7</cusip>
        <identifiers>
          <isin value="US912797PB78"/>
        </identifiers>
        <balance>2000000.00000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>1993412.74000000</valUSD>
        <pctVal>0.745644239890</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>STIV</assetCat>
        <issuerCat>UST</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2025-04-29</maturityDt>
          <couponKind>None</couponKind>
          <annualizedRt>0.00000000</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>iShares Core MSCI EAFE ETF</name>
        <lei>5493009FT582MI7Y3I36</lei>
        <title>iShares Core MSCI EAFE ETF</title>
        <cusip>46432F842</cusip>
        <identifiers>
          <isin value="US46432F8427"/>
        </identifiers>
        <balance>168500.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>12747025.00000000</valUSD>
        <pctVal>4.768077165488</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>iShares Core S&amp;P Mid-Cap ETF</name>
        <lei>549300ODQWH5PC0IUZ78</lei>
        <title>iShares Core S&amp;P Mid-Cap ETF</title>
        <cusip>464287507</cusip>
        <identifiers>
          <isin value="US4642875078"/>
        </identifiers>
        <balance>14150.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>825652.50000000</valUSD>
        <pctVal>0.308838715847</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>9R7GPTSO7KV3UQJZQ078</lei>
        <title>Long: 493994    TRS USD R E RECEIVE EQUITY / Short: 493994    TRS USD P F   .18000 PAY FIXED +0 PCNT</title>
        <cusip>000000000</cusip>
        <identifiers>
          <other otherDesc="Internal Identifier" value="493994"/>
        </identifiers>
        <balance>6228407.36000000</balance>
        <units>OU</units>
        <descOthUnits>Notional Amount</descOthUnits>
        <curCd>USD</curCd>
        <valUSD>227904.24000000</valUSD>
        <pctVal>0.085248518980</pctVal>
        <payoffProfile>N/A</payoffProfile>
        <assetCat>DCO</assetCat>
        <issuerConditional desc="derivative" issuerCat="OTHER"/>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <derivativeInfo>
          <swapDeriv derivCat="SWP">
            <counterparties>
              <counterpartyName>Morgan Stanley &amp; Co. LLC</counterpartyName>
              <counterpartyLei>9R7GPTSO7KV3UQJZQ078</counterpartyLei>
            </counterparties>
            <descRefInstrmnt>
              <indexBasketInfo>
                <indexName>Bloomberg Commodity Index 3 Month Forward</indexName>
                <indexIdentifier>BCOMF3 INDEX</indexIdentifier>
              </indexBasketInfo>
            </descRefInstrmnt>
            <swapFlag>Y</swapFlag>
            <otherRecDesc fixedOrFloating="Other">equity-performance leg</otherRecDesc>
            <fixedPmntDesc amount="-843.84000000" curCd="USD" fixedOrFloating="Fixed" fixedRt="0.18000000"/>
            <terminationDt>2025-04-30</terminationDt>
            <upfrontPmnt>0.00000000</upfrontPmnt>
            <pmntCurCd>USD</pmntCurCd>
            <upfrontRcpt>0.00000000</upfrontRcpt>
            <rcptCurCd>USD</rcptCurCd>
            <notionalAmt>6228407.36000000</notionalAmt>
            <curCd>USD</curCd>
            <unrealizedAppr>227904.24000000</unrealizedAppr>
          </swapDeriv>
        </derivativeInfo>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>iShares Core S&amp;P 500 ETF</name>
        <lei>5493007M4YMN8XL48C14</lei>
        <title>iShares Core S&amp;P 500 ETF</title>
        <cusip>464287200</cusip>
        <identifiers>
          <isin value="US4642872000"/>
        </identifiers>
        <balance>57750.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>32449725.00000000</valUSD>
        <pctVal>12.13795319291</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>Northwestern Mutual Series Fund, Inc. - Small Cap Value Portfolio</name>
        <lei>5493006BEZYY47A02J59</lei>
        <title>SMALL CAP VALUE PORTFOLIO</title>
        <cusip>668140817</cusip>
        <identifiers>
          <isin value="US6681408174"/>
        </identifiers>
        <balance>1715626.67000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>3276846.93000000</valUSD>
        <pctVal>1.225718081021</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>Northwestern Mutual Series Fund, Inc. - Small Cap Growth Stock Portfolio</name>
        <lei>YTR2S467AP5XPLF6CQ13</lei>
        <title>SMALL CAP GROWTH STK PORTFOLIO</title>
        <cusip>668140825</cusip>
        <identifiers>
          <isin value="US6681408257"/>
        </identifiers>
        <balance>1380149.40000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>3043229.42000000</valUSD>
        <pctVal>1.138332489882</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>SPDR Portfolio S&amp;P 600 Small Cap ETF</name>
        <lei>549300NYZX301TBLUJ08</lei>
        <title>SPDR Portfolio S&amp;P 600 Small Cap ETF</title>
        <cusip>78468R853</cusip>
        <identifiers>
          <isin value="US78468R8530"/>
        </identifiers>
        <balance>112000.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>4565120.00000000</valUSD>
        <pctVal>1.707601925132</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>Northwestern Mutual Series Fund, Inc. - Large Cap Blend Portfolio</name>
        <lei>549300J8IDGQV6XROU84</lei>
        <title>LARGE CAP BLEND PORT</title>
        <cusip>668140205</cusip>
        <identifiers>
          <isin value="US6681402052"/>
        </identifiers>
        <balance>9914157.09000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>10469349.88000000</valUSD>
        <pctVal>3.916103412391</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>Northwestern Mutual Series Fund, Inc. - Mid Cap Growth Stock Portfolio</name>
        <lei>LIP0ME8UWTR611J45283</lei>
        <title>MID CAP GROWTH PORTFOLIO</title>
        <cusip>668140866</cusip>
        <identifiers>
          <isin value="US6681408661"/>
        </identifiers>
        <balance>1862517.28000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>5684402.75000000</valUSD>
        <pctVal>2.126274244517</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="Please see notes to financial statements or N-PORT part F for a glossary of swap paid and received terms." noteItem="C.11.a"/>
      <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>2025-04-25</ncom:dateSigned>
      <ncom:nameOfApplicant>NORTHWESTERN MUTUAL SERIES FUND INC</ncom:nameOfApplicant>
      <ncom:signature>Linda Wisniewski</ncom:signature>
      <ncom:signerName>Linda Wisniewski</ncom:signerName>
      <ncom:title>Controller and Chief Accounting Officer</ncom:title>
    </signature>
  </formData>
  <documents>XXXX</documents>
</edgarSubmission>
