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


      <seriesClassInfo>
        <seriesId>S000018292</seriesId>
        <classId>C000050427</classId>
        <classId>C000050426</classId>
        <classId>C000050425</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>Inverse Emerging Markets 2x Strategy Fund</seriesName>
      <seriesId>S000018292</seriesId>
      <seriesLei>549300XEOQTYPZN81706</seriesLei>
      <repPdEnd>2020-03-31</repPdEnd>
      <repPdDate>2019-12-31</repPdDate>
      <isFinalFiling>N</isFinalFiling>
    </genInfo>
    <fundInfo>
      <totAssets>412309.19</totAssets>
      <totLiabs>3251.07</totLiabs>
      <netAssets>409058.12</netAssets>
      <assetsAttrMiscSec>0</assetsAttrMiscSec>
      <assetsInvested>0</assetsInvested>
      <amtPayOneYrBanksBorr>0</amtPayOneYrBanksBorr>
      <amtPayOneYrCtrldComp>0</amtPayOneYrCtrldComp>
      <amtPayOneYrOthAffil>0</amtPayOneYrOthAffil>
      <amtPayOneYrOther>0</amtPayOneYrOther>
      <amtPayAftOneYrBanksBorr>0</amtPayAftOneYrBanksBorr>
      <amtPayAftOneYrCtrldComp>0</amtPayAftOneYrCtrldComp>
      <amtPayAftOneYrOthAffil>0</amtPayAftOneYrOthAffil>
      <amtPayAftOneYrOther>0</amtPayAftOneYrOther>
      <delayDeliv>0</delayDeliv>
      <standByCommit>0</standByCommit>
      <liquidPref>0</liquidPref>
      <cshNotRptdInCorD>0</cshNotRptdInCorD>
      <isNonCashCollateral>N</isNonCashCollateral>
      <returnInfo>
        <monthlyTotReturns>
          <monthlyTotReturn classId="C000050427" rtn1="-9.60873600" rtn2="-5.55823200" rtn3="-13.78481300"/>
          <monthlyTotReturn classId="C000050425" rtn1="-9.63220600" rtn2="-5.57117400" rtn3="-13.77242500"/>
          <monthlyTotReturn classId="C000050426" rtn1="-9.65713100" rtn2="-5.66504000" rtn3="-12.60245900"/>
        </monthlyTotReturns>
        <monthlyReturnCats>
          <equityContracts>
            <mon1 netRealizedGain="-27359.75000000" netUnrealizedAppr="-8498.61000000"/>
            <mon2 netRealizedGain="-30688.03000000" netUnrealizedAppr="-2553.49000000"/>
            <mon3 netRealizedGain="-79175.61000000" netUnrealizedAppr="5263.88000000"/>
            <futureCategory>
              <instrMon1 netRealizedGain="-128.30000000" netUnrealizedAppr="0.00000000"/>
              <instrMon2 netRealizedGain="-178.96000000" netUnrealizedAppr="0.00000000"/>
              <instrMon3 netRealizedGain="-196.60000000" netUnrealizedAppr="0.00000000"/>
            </futureCategory>
            <swapCategory>
              <instrMon1 netRealizedGain="-27231.45000000" netUnrealizedAppr="-8498.61000000"/>
              <instrMon2 netRealizedGain="-30509.07000000" netUnrealizedAppr="-2553.49000000"/>
              <instrMon3 netRealizedGain="-78979.01000000" netUnrealizedAppr="5263.88000000"/>
            </swapCategory>
          </equityContracts>
        </monthlyReturnCats>
        <othMon1 netRealizedGain="0.00000000" netUnrealizedAppr="-0.46000000"/>
        <othMon2 netRealizedGain="0.00000000" netUnrealizedAppr="0.01000000"/>
        <othMon3 netRealizedGain="0.00000000" netUnrealizedAppr="-0.01000000"/>
      </returnInfo>
      <mon1Flow redemption="3303340.21000000" reinvestment="0.00000000" sales="2925158.67000000"/>
      <mon2Flow redemption="3637345.59000000" reinvestment="0.00000000" sales="3659695.67000000"/>
      <mon3Flow redemption="3922310.06000000" reinvestment="3787.45000000" sales="4063369.14000000"/>


    </fundInfo>
    <invstOrSecs>
      <invstOrSec>
        <name>J.P. MORGAN SECURITIES LLC</name>
        <lei>ZBUT11V806EZRVTWT807</lei>
        <title>J.P. Morgan Securities LLC</title>
        <cusip>N/A</cusip>
        <identifiers>
          <other otherDesc="Internal ID" value="REPO-JP M"/>
        </identifiers>
        <balance>247986.25000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>247986.25000000</valUSD>
        <pctVal>60.62372016964</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>RA</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <repurchaseAgrmt>
          <transCat>Repurchase</transCat>
          <notClearedCentCparty isCleared="N">
            <counterpartyInfos>
              <counterpartyInfo lei="ZBUT11V806EZRVTWT807" name="J.P. MORGAN SECURITIES LLC"/>
            </counterpartyInfos>
          </notClearedCentCparty>
          <isTriParty>Y</isTriParty>
          <repurchaseRt>1.53000000</repurchaseRt>
          <maturityDt>2020-01-02</maturityDt>
          <repurchaseCollaterals>
            <repurchaseCollateral>
              <principalAmt>229215.98000000</principalAmt>
              <principalCd>USD</principalCd>
              <collateralVal>252946.02000000</collateralVal>
              <collateralCd>USD</collateralCd>
              <invstCat>UST</invstCat>
            </repurchaseCollateral>
          </repurchaseCollaterals>
        </repurchaseAgrmt>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Goldman Sachs International</name>
        <lei>W22LROWP2IHZNBB6K528</lei>
        <title>BNY Mellon Emerging Markets 50 ADR Index</title>
        <cusip>N/A</cusip>
        <identifiers>
          <other otherDesc="Internal ID" value="GSSWAP"/>
        </identifiers>
        <balance>-139.45050000</balance>
        <units>NC</units>
        <curCd>USD</curCd>
        <valUSD>3437.46000000</valUSD>
        <pctVal>0.840335353812</pctVal>
        <payoffProfile>N/A</payoffProfile>
        <assetCat>DE</assetCat>
        <issuerConditional desc="Derivative" issuerCat="OTHER"/>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <derivativeInfo>
          <swapDeriv derivCat="SWP">
            <counterparties>
              <counterpartyName>Goldman Sachs International</counterpartyName>
              <counterpartyLei>W22LROWP2IHZNBB6K528</counterpartyLei>
            </counterparties>
            <descRefInstrmnt>
              <indexBasketInfo>
                <indexName>Bank of New York Mellon Emerging Markets 50 ADR Index</indexName>
                <indexIdentifier>BKTEM</indexIdentifier>
              </indexBasketInfo>
            </descRefInstrmnt>
            <swapFlag>Y</swapFlag>
            <floatingRecDesc curCd="USD" fixedOrFloating="Floating" floatingRtIndex="US0001W" floatingRtSpread="-0.45" pmntAmt="0">
              <rtResetTenors>
                <rtResetTenor rateTenor="Month" rateTenorUnit="1" resetDt="Day" resetDtUnit="7"/>
              </rtResetTenors>
            </floatingRecDesc>
            <otherPmntDesc fixedOrFloating="Other">BNY Mellon Emerging Markets 50 ADR Index-Tenor Monthly</otherPmntDesc>
            <terminationDt>2020-01-28</terminationDt>
            <upfrontPmnt>0</upfrontPmnt>
            <pmntCurCd>USD</pmntCurCd>
            <upfrontRcpt>0</upfrontRcpt>
            <rcptCurCd>USD</rcptCurCd>
            <notionalAmt>-396984.89</notionalAmt>
            <curCd>USD</curCd>
            <unrealizedAppr>3437.46</unrealizedAppr>
          </swapDeriv>
        </derivativeInfo>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>BARCLAYS CAPITAL INC.</name>
        <lei>AC28XWWI3WIBK2824319</lei>
        <title>Barclays Capital, Inc.</title>
        <cusip>N/A</cusip>
        <identifiers>
          <other otherDesc="Internal ID" value="REPO-BARC"/>
        </identifiers>
        <balance>79962.20000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>79962.20000000</valUSD>
        <pctVal>19.54788234004</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>RA</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <repurchaseAgrmt>
          <transCat>Repurchase</transCat>
          <notClearedCentCparty isCleared="N">
            <counterpartyInfos>
              <counterpartyInfo lei="AC28XWWI3WIBK2824319" name="BARCLAYS CAPITAL INC."/>
            </counterpartyInfos>
          </notClearedCentCparty>
          <isTriParty>Y</isTriParty>
          <repurchaseRt>1.40000000</repurchaseRt>
          <maturityDt>2020-01-02</maturityDt>
          <repurchaseCollaterals>
            <repurchaseCollateral>
              <principalAmt>80872.91000000</principalAmt>
              <principalCd>USD</principalCd>
              <collateralVal>81561.48000000</collateralVal>
              <collateralCd>USD</collateralCd>
              <invstCat>UST</invstCat>
            </repurchaseCollateral>
          </repurchaseCollaterals>
        </repurchaseAgrmt>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>BNP Paribas</name>
        <lei>R0MUWSFPU8MPRO8K5P83</lei>
        <title>BNY Mellon Emerging Markets 50 ADR Index</title>
        <cusip>N/A</cusip>
        <identifiers>
          <other otherDesc="Internal ID" value="BNPSWAP"/>
        </identifiers>
        <balance>-132.16900000</balance>
        <units>NC</units>
        <curCd>USD</curCd>
        <valUSD>3220.22000000</valUSD>
        <pctVal>0.787227986086</pctVal>
        <payoffProfile>N/A</payoffProfile>
        <assetCat>DE</assetCat>
        <issuerConditional desc="Derivative" issuerCat="OTHER"/>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <derivativeInfo>
          <swapDeriv derivCat="SWP">
            <counterparties>
              <counterpartyName>BNP Paribas</counterpartyName>
              <counterpartyLei>R0MUWSFPU8MPRO8K5P83</counterpartyLei>
            </counterparties>
            <descRefInstrmnt>
              <indexBasketInfo>
                <indexName>Bank of New York Mellon Emerging Markets 50 ADR Index</indexName>
                <indexIdentifier>BKTEM</indexIdentifier>
              </indexBasketInfo>
            </descRefInstrmnt>
            <swapFlag>Y</swapFlag>
            <floatingRecDesc curCd="USD" fixedOrFloating="Floating" floatingRtIndex="US0001M" floatingRtSpread="-0.3" pmntAmt="0">
              <rtResetTenors>
                <rtResetTenor rateTenor="Month" rateTenorUnit="1" resetDt="Month" resetDtUnit="1"/>
              </rtResetTenors>
            </floatingRecDesc>
            <otherPmntDesc fixedOrFloating="Other">BNY Mellon Emerging Markets 50 ADR Index-Tenor Monthly</otherPmntDesc>
            <terminationDt>2020-01-28</terminationDt>
            <upfrontPmnt>0</upfrontPmnt>
            <pmntCurCd>USD</pmntCurCd>
            <upfrontRcpt>0</upfrontRcpt>
            <rcptCurCd>USD</rcptCurCd>
            <notionalAmt>-376256.07</notionalAmt>
            <curCd>USD</curCd>
            <unrealizedAppr>3220.22</unrealizedAppr>
          </swapDeriv>
        </derivativeInfo>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>BOFA SECURITIES, INC.</name>
        <lei>549300HN4UKV1E2R3U73</lei>
        <title>BofA Securities, Inc.</title>
        <cusip>N/A</cusip>
        <identifiers>
          <other otherDesc="Internal ID" value="REPO-BANK"/>
        </identifiers>
        <balance>79962.20000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>79962.20000000</valUSD>
        <pctVal>19.54788234004</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>RA</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <repurchaseAgrmt>
          <transCat>Repurchase</transCat>
          <notClearedCentCparty isCleared="N">
            <counterpartyInfos>
              <counterpartyInfo lei="549300HN4UKV1E2R3U73" name="BOFA SECURITIES, INC."/>
            </counterpartyInfos>
          </notClearedCentCparty>
          <isTriParty>Y</isTriParty>
          <repurchaseRt>1.50000000</repurchaseRt>
          <maturityDt>2020-01-02</maturityDt>
          <repurchaseCollaterals>
            <repurchaseCollateral>
              <principalAmt>66771.92000000</principalAmt>
              <principalCd>USD</principalCd>
              <collateralVal>81561.57000000</collateralVal>
              <collateralCd>USD</collateralCd>
              <invstCat>UST</invstCat>
            </repurchaseCollateral>
          </repurchaseCollaterals>
        </repurchaseAgrmt>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
    </invstOrSecs>
    <signature>
      <ncom:dateSigned>2020-01-30</ncom:dateSigned>
      <ncom:nameOfApplicant>Rydex Series Funds</ncom:nameOfApplicant>
      <ncom:signature>John Sullivan</ncom:signature>
      <ncom:signerName>John Sullivan</ncom:signerName>
      <ncom:title>CFO</ncom:title>
    </signature>
  </formData>
  <documents>XXXX</documents>
</edgarSubmission>
