<?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>0000732697</cik>
          <ccc>XXXXXXXX</ccc>
        </issuerCredentials>
      </filer>


      <seriesClassInfo>
        <seriesId>S000020001</seriesId>
        <classId>C000056079</classId>
        <classId>C000074793</classId>
      </seriesClassInfo>


    </filerInfo>
  </headerData>
  <formData>
    <genInfo>
      <regName>ULTRA SERIES FUND</regName>
      <regFileNumber>811-04815</regFileNumber>
      <regCik>0000732697</regCik>
      <regLei>254900JPNAJ16VJV5X45</regLei>
      <regStreet1>550 SCIENCE DRIVE</regStreet1>
      <regCity>MADISON</regCity>
      <regStateConditional regCountry="US" regState="US-WI"/>
      <regZipOrPostalCode>53711</regZipOrPostalCode>
      <regPhone>608-274-0300</regPhone>
      <seriesName>Moderate Allocation Fund</seriesName>
      <seriesId>S000020001</seriesId>
      <seriesLei>254900W3DITR2R4CW823</seriesLei>
      <repPdEnd>2025-12-31</repPdEnd>
      <repPdDate>2025-03-31</repPdDate>
      <isFinalFiling>N</isFinalFiling>
    </genInfo>
    <fundInfo>
      <totAssets>111754370.97</totAssets>
      <totLiabs>8888461.64</totLiabs>
      <netAssets>102865909.33</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>0.00000000</cshNotRptdInCorD>
      <borrowers>
        <borrower aggrVal="1641991.00000000" lei="549300KUN9K9K32C6D97" name="BNP Paribas Prime Brokerage International, Limited"/>
        <borrower aggrVal="1004003.00000000" lei="549300ZP8XN77GK5BS04" name="CHARLES SCHWAB &amp; CO., INC."/>
        <borrower aggrVal="3250464.00000000" lei="ZBUT11V806EZRVTWT807" name="J.P. Morgan Securities LLC"/>
        <borrower aggrVal="100624.00000000" lei="U4ONQX15J3RO8XCKE979" name="RAYMOND JAMES &amp; ASSOCIATES, INC."/>
        <borrower aggrVal="116353.12000000" lei="4ZHCHI4KYZG2WVRT8631" name="Macquarie Bank Limited"/>
        <borrower aggrVal="488040.00000000" lei="549300QQRY1JCFQHYS08" name="Janney Montgomery Scott LLC"/>
        <borrower aggrVal="467368.00000000" lei="549300LCO2FLSSVFFR64" name="RBC Capital Markets, LLC"/>
        <borrower aggrVal="358071.00000000" lei="L3I9ZG2KFGXZ61BMYR72" name="The Bank of Nova Scotia"/>
        <borrower aggrVal="75936.00000000" lei="12UUJYTN7D3SW8KCSG25" name="Citadel Securities LLC"/>
        <borrower aggrVal="1652352.00000000" lei="549300CSX55MXZ47EI78" name="Wedbush Securities Inc."/>
        <borrower aggrVal="1129393.20000000" lei="549300HN4UKV1E2R3U73" name="BofA Securities, Inc."/>
      </borrowers>
      <aggregateCondition isNonCashCollateral="Y">
        <aggregateInfos>
          <aggregateInfo amt="1717130.53000000" collatrl="1676403.29000000">
            <invstCat>UST</invstCat>
          </aggregateInfo>
        </aggregateInfos>
      </aggregateCondition>
      <returnInfo>
        <monthlyTotReturns>
          <monthlyTotReturn classId="C000056079" rtn1="2.20000000" rtn2="0.34000000" rtn3="-2.24000000"/>
          <monthlyTotReturn classId="C000074793" rtn1="2.18000000" rtn2="0.32000000" rtn3="-2.27000000"/>
        </monthlyTotReturns>
        <othMon1 netRealizedGain="-62283.88000000" netUnrealizedAppr="2325658.96000000"/>
        <othMon2 netRealizedGain="0.00000000" netUnrealizedAppr="222304.38000000"/>
        <othMon3 netRealizedGain="-51482.79000000" netUnrealizedAppr="-2598142.96000000"/>
      </returnInfo>
      <mon1Flow redemption="2871102.64000000" reinvestment="0.00000000" sales="2375516.82000000"/>
      <mon2Flow redemption="1550147.13000000" reinvestment="0.00000000" sales="619367.08000000"/>
      <mon3Flow redemption="1537569.62000000" reinvestment="0.00000000" sales="121652.12000000"/>


    </fundInfo>
    <invstOrSecs>
      <invstOrSec>
        <name>Invesco Exchange-Traded Fund Trust - Invesco S&amp;P 500 Quality Etf</name>
        <lei>549300CMNB8U49G4GY75</lei>
        <title>Invesco Exchange-Traded Fund Trust - Invesco S&amp;P 500 Quality ETF</title>
        <cusip>46137V241</cusip>
        <identifiers>
          <isin value="US46137V2410"/>
        </identifiers>
        <balance>153197.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>10163088.98000000</valUSD>
        <pctVal>9.879938889565</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>State Street Global Advisors</name>
        <lei>5493008BJIBKQ5KTIF74</lei>
        <title>State Street Navigator Securities Lending Government Money Market Portfolio</title>
        <cusip>857509301</cusip>
        <identifiers>
          <isin value="US8575093013"/>
        </identifiers>
        <balance>8854768.25000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>8854768.25000000</valUSD>
        <pctVal>8.608068803040</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>STIV</assetCat>
        <issuerCat>RF</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <cashCollateralCondition cashCollateralVal="8854768.25000000" isCashCollateral="Y"/>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Distillate US Fundamental Stability &amp; Value ETF</name>
        <lei>5493002W0E8K4UD8QD78</lei>
        <title>Distillate U.S. Fundamental Stability &amp; Value ETF</title>
        <cusip>26922A321</cusip>
        <identifiers>
          <isin value="US26922A3216"/>
        </identifiers>
        <balance>94476.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>5124378.24000000</valUSD>
        <pctVal>4.981609819401</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>
          <loanByFundCondition isLoanByFund="Y" loanVal="1014288.00000000"/>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Energy Select Sector SPDR Fund</name>
        <lei>54930064FLK0RD4TRU75</lei>
        <title>Energy Select Sector SPDR Fund ETF</title>
        <cusip>81369Y506</cusip>
        <identifiers>
          <isin value="US81369Y5069"/>
        </identifiers>
        <balance>19499.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>1822181.55000000</valUSD>
        <pctVal>1.771414418895</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>Vanguard Information Technology ETF</name>
        <lei>J2NTZGJBERBYMUMBIE74</lei>
        <title>Vanguard Information Technology ETF</title>
        <cusip>92204A702</cusip>
        <identifiers>
          <isin value="US92204A7028"/>
        </identifiers>
        <balance>8468.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>4592873.84000000</valUSD>
        <pctVal>4.464913468334</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>Madison Investors Fund</name>
        <lei>5493000V85LMHCOTG216</lei>
        <title>Madison Investors Fund</title>
        <cusip>557492386</cusip>
        <identifiers>
          <isin value="US5574923869"/>
        </identifiers>
        <balance>629465.82000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>18248214.01000000</valUSD>
        <pctVal>17.73980721976</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>39030.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>4081367.10000000</valUSD>
        <pctVal>3.967657629804</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>Vanguard FTSE Europe ETF</name>
        <lei>5493000IQHGUVNGQR883</lei>
        <title>Vanguard FTSE Europe ETF</title>
        <cusip>922042874</cusip>
        <identifiers>
          <isin value="US9220428745"/>
        </identifiers>
        <balance>50615.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>3553679.15000000</valUSD>
        <pctVal>3.454671400025</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>
          <loanByFundCondition isLoanByFund="Y" loanVal="1362074.00000000"/>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Franklin FTSE Japan ETF</name>
        <lei>549300V7MZYC1Z30JS82</lei>
        <title>Franklin FTSE Japan ETF</title>
        <cusip>35473P744</cusip>
        <identifiers>
          <isin value="US35473P7446"/>
        </identifiers>
        <balance>144141.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>4237745.40000000</valUSD>
        <pctVal>4.119679131406</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>
          <loanByFundCondition isLoanByFund="Y" loanVal="4154885.20000000"/>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>State Street Global Advisors</name>
        <lei>549300BZ5TGIFZUZDZ37</lei>
        <title>State Street Institutional US Government Money Market Fund</title>
        <cusip>857492706</cusip>
        <identifiers>
          <isin value="US8574927062"/>
        </identifiers>
        <balance>1002727.66000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>1002727.66000000</valUSD>
        <pctVal>0.974791032841</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>iShares MSCI Emerging Markets Asia ETF</name>
        <lei>549300QNROXHZ53JWF91</lei>
        <title>iShares MSCI Emerging Markets Asia ETF</title>
        <cusip>464286426</cusip>
        <identifiers>
          <isin value="US4642864262"/>
        </identifiers>
        <balance>81856.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>6063073.92000000</valUSD>
        <pctVal>5.894152843727</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 S&amp;P Bank ETF</name>
        <lei>549300WRV3OCU6OV1X49</lei>
        <title>SPDR S&amp;P Bank ETF</title>
        <cusip>78464A797</cusip>
        <identifiers>
          <isin value="US78464A7972"/>
        </identifiers>
        <balance>67153.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>3556422.88000000</valUSD>
        <pctVal>3.457338687971</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>
          <loanByFundCondition isLoanByFund="Y" loanVal="1869329.12000000"/>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Schwab Intermediate-Term U.S. Treasury ETF</name>
        <lei>549300LPS1K6133V2Q55</lei>
        <title>Schwab Intermediate-Term U.S. Treasury ETF</title>
        <cusip>808524854</cusip>
        <identifiers>
          <isin value="US8085248545"/>
        </identifiers>
        <balance>252255.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>6271059.30000000</valUSD>
        <pctVal>6.096343619422</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>
          <loanByFundCondition isLoanByFund="Y" loanVal="1884019.00000000"/>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Madison Core Bond Fund</name>
        <lei>254900KXQJDPZNNEA190</lei>
        <title>Madison Core Bond Fund</title>
        <cusip>557492196</cusip>
        <identifiers>
          <isin value="US5574921962"/>
        </identifiers>
        <balance>3080831.56000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>27604250.73000000</valUSD>
        <pctVal>26.83517883601</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>Janus Henderson AAA CLO ETF</name>
        <lei>549300N7UZ9PO4OVKA94</lei>
        <title>Janus Henderson AAA CLO ETF</title>
        <cusip>47103U845</cusip>
        <identifiers>
          <isin value="US47103U8457"/>
        </identifiers>
        <balance>10301.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>522363.71000000</valUSD>
        <pctVal>0.507810326474</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>Madison Mid Cap Fund</name>
        <lei>254900GFBYFLI6QYMW95</lei>
        <title>Madison Mid Cap Fund</title>
        <cusip>557492485</cusip>
        <identifiers>
          <isin value="US5574924859"/>
        </identifiers>
        <balance>64914.54000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>1049668.06000000</valUSD>
        <pctVal>1.020423643592</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>Janus Henderson Mortgage-Backed Securities ETF</name>
        <lei>549300V6TVE4ZJCDWY16</lei>
        <title>Janus Henderson Mortgage-Backed Securities ETF</title>
        <cusip>47103U852</cusip>
        <identifiers>
          <isin value="US47103U8523"/>
        </identifiers>
        <balance>108609.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>4909126.80000000</valUSD>
        <pctVal>4.772355420736</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>
    <signature>
      <ncom:dateSigned>2025-04-14</ncom:dateSigned>
      <ncom:nameOfApplicant>ULTRA SERIES FUND</ncom:nameOfApplicant>
      <ncom:signature>Greg Hoppe</ncom:signature>
      <ncom:signerName>Greg Hoppe</ncom:signerName>
      <ncom:title>Chief Financial Officer</ncom:title>
    </signature>
  </formData>
  <documents>XXXX</documents>
</edgarSubmission>
