<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0206</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2012-08-01</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001375271</issuerCik>
        <issuerName>Eloqua, Inc.</issuerName>
        <issuerTradingSymbol>ELOQ</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001015934</rptOwnerCik>
            <rptOwnerName>DEMPSEY NEAL</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O BAY PARTNERS</rptOwnerStreet1>
            <rptOwnerStreet2>490 S. CALIFORNIA AVENUE SUITE 200</rptOwnerStreet2>
            <rptOwnerCity>PALO ALTO</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>64306</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>Series B Convertible Preferred Stock</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F2"/>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F1"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>4818733</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>Directly owned by Bay Partners X, L.P.</value>
                    <footnoteId id="F3"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Series C Convertible Preferred Stock</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F2"/>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F4"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F4"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>1111967</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>Directly owned by Bay Partners X, L.P.</value>
                    <footnoteId id="F3"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Series B Convertible Preferred Stock</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F2"/>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F1"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>267001</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>Directly owned by Bay Partners X Entrepreneurs Fund, L.P.</value>
                    <footnoteId id="F5"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Series C Convertible Preferred Stock</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F2"/>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F4"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F4"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>61613</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>Directly owned by Bay Partners X Entrepreneurs Fund, L.P.</value>
                    <footnoteId id="F5"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">The Series B Convertible Preferred Stock is convertible into Common Stock on a 2.5-for-one basis into the number of shares of Common Stock as shown in column 3 at anytime at the holder's election, and automatically upon the closing of the Issuer's initial public offering, and has no expiration date.</footnote>
        <footnote id="F2">Not applicable.</footnote>
        <footnote id="F3">The securities are held directly by Bay Partners X, L.P. Bay Management Company X, LLC is the General Partner of Bay Partners X, L.P. and has the sole voting and dispositive power with respect to the shares.  Neal Dempsey, a director of the Issuer, and Stuart G. Phillips are Managing Members of the Bay Management Company X, LLC and share voting and dispositive power over the shares held of record by Bay Partners X, L.P.  Each Reporting Person disclaims beneficial ownership of all shares held by the foregoing entities except to the extent of his pecuniary interest therein.</footnote>
        <footnote id="F4">The Series C Convertible Preferred Stock is convertible into Common Stock on a 2.5-for-one basis into the number of shares of Common Stock as shown in column 3 at anytime at the holder's election, and automatically upon the closing of the Issuer's initial public offering, and has no expiration date.</footnote>
        <footnote id="F5">The securities are held directly by Bay Partners X Entrepreneurs Fund, L.P. Bay Management Company X, LLC is the General Partner of Bay Partners X Entrepreneurs Fund, L.P. and has the sole voting and dispositive power with respect to the shares.  Neal Dempsey, a director of the Issuer, and Stuart G. Phillips are Managing Members of the Bay Management Company X, LLC and share voting and dispositive power over the shares held of record by Bay Partners X Entrepreneurs Fund, L.P.  Each Reporting Person disclaims beneficial ownership of all shares held by the foregoing entities except to the extent of his pecuniary interest therein.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Stephen E. Holsten, Attorney-in-Fact</signatureName>
        <signatureDate>2012-08-01</signatureDate>
    </ownerSignature>
</ownershipDocument>
