<?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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    <isConfidential>false</isConfidential>
    <filerInfo>

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


      <seriesClassInfo>
        <seriesId>S000003771</seriesId>
        <classId>C000010455</classId>
        <classId>C000010456</classId>
        <classId>C000010454</classId>
      </seriesClassInfo>

    </filerInfo>
  </headerData>
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      <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>Inverse Mid-Cap Strategy Fund</seriesName>
      <seriesId>S000003771</seriesId>
      <seriesLei>54930037B8QM4B0GQX38</seriesLei>
      <repPdEnd>2025-03-31</repPdEnd>
      <repPdDate>2024-12-31</repPdDate>
      <isFinalFiling>N</isFinalFiling>
    </genInfo>
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      <totLiabs>692.86</totLiabs>
      <netAssets>195351.07</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>
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      <amtPayAftOneYrOther>0.00000000</amtPayAftOneYrOther>
      <delayDeliv>0.00000000</delayDeliv>
      <standByCommit>0.00000000</standByCommit>
      <liquidPref>0.00000000</liquidPref>
      <cshNotRptdInCorD>10999.77000000</cshNotRptdInCorD>
      <curMetrics>
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      <isNonCashCollateral>N</isNonCashCollateral>
      <returnInfo>
        <monthlyTotReturns>
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        <othMon2 netRealizedGain="0.00000000" netUnrealizedAppr="80.80000000"/>
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      <mon3Flow redemption="38463.18000000" reinvestment="35398.99000000" sales="35406.45000000"/>


      <varInfo>

        <fundsDesignatedInfo>
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          <indexIdentifier>SNP400</indexIdentifier>

        </fundsDesignatedInfo>

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        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
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        <identifiers>
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        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
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        <identifiers>
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        <payoffProfile>N/A</payoffProfile>
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        <issuerConditional desc="Derivative" issuerCat="OTHER"/>
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        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
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            <descRefInstrmnt>
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            <otherPmntDesc fixedOrFloating="Other">S&amp;P MidCap 400 Index-Tenor Quarterly</otherPmntDesc>
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      <invstOrSec>
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        <title>BofA Securities, Inc.</title>
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        <fairValLevel>2</fairValLevel>
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              <invstCat>UST</invstCat>
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        <fairValLevel>2</fairValLevel>
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          <maturityDt>2025-01-02</maturityDt>
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              <invstCat>UST</invstCat>
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      </invstOrSec>
      <invstOrSec>
        <name>BNP Paribas</name>
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        <curCd>USD</curCd>
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        <invCountry>US</invCountry>
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        <fairValLevel>2</fairValLevel>
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            <terminationDt>2025-03-27</terminationDt>
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        <securityLending>
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      </invstOrSec>
    </invstOrSecs>
    <signature>
      <ncom:dateSigned>2025-01-30</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>
  <documents>XXXX</documents>
</edgarSubmission>
