<?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">
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    <submissionType>NPORT-P</submissionType>
    <isConfidential>false</isConfidential>
    <filerInfo>

      <filer>
        <issuerCredentials>
          <cik>0000899148</cik>
          <ccc>XXXXXXXX</ccc>
        </issuerCredentials>
      </filer>


      <seriesClassInfo>
        <seriesId>S000018293</seriesId>
        <classId>C000050428</classId>
        <classId>C000050429</classId>
        <classId>C000050430</classId>
      </seriesClassInfo>

    </filerInfo>
  </headerData>
  <formData>
    <genInfo>
      <regName>Rydex Series Funds</regName>
      <regFileNumber>811-07584</regFileNumber>
      <regCik>0000899148</regCik>
      <regLei>5493004D62WV1EDNTU07</regLei>
      <regStreet1>702 King Farm Blvd., Suite 200</regStreet1>
      <regCity>Rockville</regCity>
      <regStateConditional regCountry="US" regState="US-MD"/>
      <regZipOrPostalCode>20850</regZipOrPostalCode>
      <regPhone>301-296-5100</regPhone>
      <seriesName>Japan 2x Strategy Fund</seriesName>
      <seriesId>S000018293</seriesId>
      <seriesLei>549300TYQ6P1QBF6GR37</seriesLei>
      <repPdEnd>2025-03-31</repPdEnd>
      <repPdDate>2025-03-31</repPdDate>
      <isFinalFiling>N</isFinalFiling>
    </genInfo>
    <fundInfo>
      <totAssets>863148.85</totAssets>
      <totLiabs>2275.64</totLiabs>
      <netAssets>860873.21</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>2.86000000</cshNotRptdInCorD>
      <curMetrics>
        <curMetric>
          <curCd>USD</curCd>
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        </curMetric>
      </curMetrics>
      <creditSprdRiskInvstGrade period10Yr="0.00000000" period1Yr="0.00000000" period30Yr="0.00000000" period3Mon="0.00000000" period5Yr="0.00000000"/>
      <creditSprdRiskNonInvstGrade period10Yr="0.00000000" period1Yr="0.00000000" period30Yr="0.00000000" period3Mon="0.00000000" period5Yr="0.00000000"/>
      <isNonCashCollateral>N</isNonCashCollateral>
      <returnInfo>
        <monthlyTotReturns>
          <monthlyTotReturn classId="C000050428" rtn1="1.40137500" rtn2="-3.74134000" rtn3="-6.76698800"/>
          <monthlyTotReturn classId="C000050429" rtn1="1.32279500" rtn2="-3.82423100" rtn3="-6.81441600"/>
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        <monthlyReturnCats>
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            <mon2 netRealizedGain="-50243.05000000" netUnrealizedAppr="-54796.87000000"/>
            <mon3 netRealizedGain="-129003.75000000" netUnrealizedAppr="55219.96000000"/>
            <futureCategory>
              <instrMon1 netRealizedGain="1247.60000000" netUnrealizedAppr="-15176.00000000"/>
              <instrMon2 netRealizedGain="-50243.05000000" netUnrealizedAppr="-54796.87000000"/>
              <instrMon3 netRealizedGain="-129003.75000000" netUnrealizedAppr="55219.96000000"/>
            </futureCategory>
          </equityContracts>
          <foreignExchgContracts>
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            <mon2 netRealizedGain="-12589.80000000" netUnrealizedAppr="83587.40000000"/>
            <mon3 netRealizedGain="57373.40000000" netUnrealizedAppr="-57424.55000000"/>
            <futureCategory>
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              <instrMon3 netRealizedGain="57373.40000000" netUnrealizedAppr="-57424.55000000"/>
            </futureCategory>
          </foreignExchgContracts>
        </monthlyReturnCats>
        <othMon1 netRealizedGain="0.00000000" netUnrealizedAppr="-14.76000000"/>
        <othMon2 netRealizedGain="0.00000000" netUnrealizedAppr="26.15000000"/>
        <othMon3 netRealizedGain="0.00000000" netUnrealizedAppr="-117.78000000"/>
      </returnInfo>
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      <mon2Flow redemption="678744.17000000" reinvestment="0.00000000" sales="112186.03000000"/>
      <mon3Flow redemption="631684.17000000" reinvestment="0.00000000" sales="779988.75000000"/>


      <varInfo>

        <fundsDesignatedInfo>
          <nameDesignatedIndex>Nikkei 225 Stock Average</nameDesignatedIndex>
          <indexIdentifier>NIKJPYUSD</indexIdentifier>

        </fundsDesignatedInfo>

      </varInfo>
    </fundInfo>
    <invstOrSecs>
      <invstOrSec>
        <name>TREASURY BILL</name>
        <lei>254900HROIFWPRGM1V77</lei>
        <title>U.S. Treasury Bills</title>
        <cusip>912797NY9</cusip>
        <identifiers>
          <isin value="US912797NY99"/>
        </identifiers>
        <balance>390000.00000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>389678.01000000</valUSD>
        <pctVal>45.26543577770</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>DBT</assetCat>
        <issuerCat>UST</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2025-04-08</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>Chicago Mercantile Exchange</name>
        <lei>N/A</lei>
        <title>Japanese Yen Futures Contracts</title>
        <cusip>N/A</cusip>
        <identifiers>
          <ticker value="JYM5"/>
        </identifiers>
        <balance>20.00000000</balance>
        <units>NC</units>
        <curCd>USD</curCd>
        <valUSD>-11710.50000000</valUSD>
        <pctVal>-1.36030484674</pctVal>
        <payoffProfile>N/A</payoffProfile>
        <assetCat>DFE</assetCat>
        <issuerConditional desc="Derivative" issuerCat="OTHER"/>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <derivativeInfo>
          <futrDeriv derivCat="FUT">
            <counterparties>
              <counterpartyName>Goldman Sachs &amp; Co. LLC</counterpartyName>
              <counterpartyLei>FOR8UP27PHTHYVLBNG30</counterpartyLei>
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            <payOffProf>Long</payOffProf>
            <descRefInstrmnt>
              <otherRefInst>
                <issuerName>N/A</issuerName>
                <issueTitle>Japanese Yen</issueTitle>
                <identifiers>
                  <cusip value="N/A"/>
                  <other otherDesc="Currency" value="Japanese Yen"/>
                </identifiers>
              </otherRefInst>
            </descRefInstrmnt>
            <expDate>2025-06-16</expDate>
            <notionalAmt>1693210.50000000</notionalAmt>
            <curCd>USD</curCd>
            <unrealizedAppr>-11710.50000000</unrealizedAppr>
          </futrDeriv>
        </derivativeInfo>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
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          <isLoanByFund>N</isLoanByFund>
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      </invstOrSec>
      <invstOrSec>
        <name>Chicago Mercantile Exchange</name>
        <lei>N/A</lei>
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          <ticker value="KMYM5"/>
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        <units>NC</units>
        <curCd>USD</curCd>
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        <payoffProfile>N/A</payoffProfile>
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        <issuerConditional desc="Derivative" issuerCat="OTHER"/>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
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            <payOffProf>Long</payOffProf>
            <descRefInstrmnt>
              <indexBasketInfo>
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                <indexIdentifier>JP9010C00002</indexIdentifier>
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        <securityLending>
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          <isLoanByFund>N</isLoanByFund>
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      </invstOrSec>
      <invstOrSec>
        <name>Chicago Mercantile Exchange</name>
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        <cusip>N/A</cusip>
        <identifiers>
          <ticker value="NXM5"/>
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        <units>NC</units>
        <curCd>USD</curCd>
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        <issuerConditional desc="Derivative" issuerCat="OTHER"/>
        <invCountry>US</invCountry>
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        <fairValLevel>1</fairValLevel>
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        <securityLending>
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      </invstOrSec>
      <invstOrSec>
        <name>BOFA SECURITIES, INC.</name>
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        <title>BofA Securities, Inc.</title>
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        <valUSD>212158.73000000</valUSD>
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        <issuerCat>CORP</issuerCat>
        <invCountry>US</invCountry>
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        <fairValLevel>2</fairValLevel>
        <repurchaseAgrmt>
          <transCat>Repurchase</transCat>
          <notClearedCentCparty isCleared="N">
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          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>J.P. MORGAN SECURITIES LLC</name>
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        <title>J.P. Morgan Securities LLC</title>
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        <identifiers>
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        <curCd>USD</curCd>
        <valUSD>276829.44000000</valUSD>
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        <invCountry>US</invCountry>
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        <fairValLevel>2</fairValLevel>
        <repurchaseAgrmt>
          <transCat>Repurchase</transCat>
          <notClearedCentCparty isCleared="N">
            <counterpartyInfos>
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          </notClearedCentCparty>
          <isTriParty>Y</isTriParty>
          <repurchaseRt>4.36000000</repurchaseRt>
          <maturityDt>2025-04-01</maturityDt>
          <repurchaseCollaterals>
            <repurchaseCollateral>
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              <principalCd>USD</principalCd>
              <collateralVal>282366.03000000</collateralVal>
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              <invstCat>UST</invstCat>
            </repurchaseCollateral>
          </repurchaseCollaterals>
        </repurchaseAgrmt>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
    </invstOrSecs>
    <signature>
      <ncom:dateSigned>2025-04-30</ncom:dateSigned>
      <ncom:nameOfApplicant>Rydex Series Funds</ncom:nameOfApplicant>
      <ncom:signature>James Howley</ncom:signature>
      <ncom:signerName>James Howley</ncom:signerName>
      <ncom:title>CFO</ncom:title>
    </signature>
  </formData>
</edgarSubmission>
