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

    <schemaVersion>X0206</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2014-07-01</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001589390</issuerCik>
        <issuerName>Evanston Alternative Opportunities Fund</issuerName>
        <issuerTradingSymbol>NONE</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001508024</rptOwnerCik>
            <rptOwnerName>Evanston Capital Management, LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>1560 SHERMAN AVENUE</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 960</rptOwnerStreet2>
            <rptOwnerCity>EVANSTON</rptOwnerCity>
            <rptOwnerState>IL</rptOwnerState>
            <rptOwnerZipCode>60201</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>1</isOther>
            <officerTitle></officerTitle>
            <otherText>Investment Adviser</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common shares of beneficial interest</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1577750</value>
                    <footnoteId id="F1"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">Evanston Alternative Opportunities Fund commenced operations on July 1, 2014.  In connection with the commencement of operations, the Reporting Person purchased 1,567,750 shares of Evanston Alternative Opportunities Fund in order to provide Evanston Alternative Opportunities Fund with seed capital.  At the time of this purchase, the Reporting Person also owned 10,000 shares of Evanston Alternative Opportunities Fund's common stock, which it had purchased in a private placement in order to provide Evanston Alternative Opportunities Fund with net capital of $100,000 in accordance with section 14(a) of the Investment Company Act of 1940.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Scott Zimmerman By: Scott Zimmerman (General Counsel)</signatureName>
        <signatureDate>2014-07-02</signatureDate>
    </ownerSignature>
</ownershipDocument>
