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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2014-03-26</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001509261</issuerCik>
        <issuerName>AntriaBio, Inc.</issuerName>
        <issuerTradingSymbol>ANTB</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001567953</rptOwnerCik>
            <rptOwnerName>Konus Advisory Group, Inc.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>890 SANTA CRUZ AVENUE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>MENLO PARK</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94025</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2014-03-31</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>1057693</value>
                    <footnoteId id="F2"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>275000</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>5057693</value>
                    <footnoteId id="F1"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Warrant to purchase common stock</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>1.25</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2014-03-31</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F3"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>234700</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F3"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <value>2014-03-31</value>
            </exerciseDate>
            <expirationDate>
                <value>2019-03-31</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>234700</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>234700</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Konus Advisory Group, Inc. owns 5,057, 693 shares of common stock of the Issuer. Mr. Elam and Dr. Hoyoung Huh are significant stockholders, managing members and members of the board of directors of Konus Advisory Group, Inc. Mr. Elam and Dr. Huh share voting and dispositive power of the shares of the Issuer's common stock held by Konus Advisory Group, Inc.</footnote>
        <footnote id="F2">On March 26, 2014, AntriaBio, Inc. (the &quot;Company&quot; or &quot;AntriaBio, Inc.&quot;) entered into a repayment agreement (the &quot;Repayment Agreement&quot;) with Konus Advisory Group, Inc. (&quot;Konus&quot;).  Pursuant to the terms of the Repayment Agreement, AntriaBio, Inc. agreed to repay to Konus $1,182,644, representing the total amounts due and owing to Konus for services rendered by Konus and its consultants to the Company (the &quot;Balance&quot;) as set forth in the Konus Agreements (as defined in the Repayment Agreement) through, (i) the issuance of $275,000 worth of shares of our common stock (the &quot;Payment Shares&quot;) with such Payment Shares to be valued at $0.26 per share and (ii) a cash payment or series of cash payments totaling $907,644 to be paid at such time as mutually agreed to by Konus and the Company.</footnote>
        <footnote id="F3">As set forth on the Company's Current Report on Form 8-K filed with the SEC on November 15, 2013, on November 14, 2013, the Company issued a 14% promissory note in the principal amount of $250,000 (the &quot;Konus Note&quot;) to Konus in order to evidence funds Konus loaned to the Company.  Pursuant to the terms of the Konus Note, the principal balance of the Note is due at the earlier of, (i) November 1, 2014 or (ii) ten days after the closing of an equity financing that raises at least three million dollars.   As set forth in Item 1.01 of the Company's Current Report on Form 8-K filed with the SEC on April 1, 2014, on March 31, 2014, the Company completed an initial close of an equity financing for aggregate proceeds of approximately $5 million.  As a result, the Company agreed to pay the outstanding principal and interest on the Konus Note within ten (10) days after the closing of the PIPE Financing and we agreed to issue to Konus a warrant (the &quot;Konus Warrant&quot;) to purchase 234,700 shares of</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Hoyoung Huh</signatureName>
        <signatureDate>2014-04-09</signatureDate>
    </ownerSignature>
</ownershipDocument>
