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

    <schemaVersion>X0204</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2011-07-22</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001162816</issuerCik>
        <issuerName>NEAH POWER SYSTEMS, INC.</issuerName>
        <issuerTradingSymbol>NPWS</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001538547</rptOwnerCik>
            <rptOwnerName>Sierra Trading Corp.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>520 BRICKELL KEY DRIVE</rptOwnerStreet1>
            <rptOwnerStreet2>UNIT 1607</rptOwnerStreet2>
            <rptOwnerCity>MIAMI</rptOwnerCity>
            <rptOwnerState>FL</rptOwnerState>
            <rptOwnerZipCode>33131</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Shares, Par Value $0.001</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1033337</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>Series &quot;B&quot; Preferred Shares, Par Value $1.00</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F2"/>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F1"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Series B Preferred</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>142200</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">The convertible preferred stock is convertible at any time, at the Company's election, and has no expiration date.</footnote>
        <footnote id="F2">The number of shares of common stock to be issued upon any conversion shall be calculated by multiplying the number of Series B Preferred shares being converted by the per share purchase price received by the Company for such Series B Preferred Shares, and then, multiplying such number by 130% and then dividing the calculated value by the average closing bid price of the Company's during the five (5) prior to any notice of conversion.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Daisy Rodriguez</signatureName>
        <signatureDate>2012-01-06</signatureDate>
    </ownerSignature>
</ownershipDocument>
