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

    <schemaVersion>X0708</schemaVersion>

    <submissionType>D</submissionType>

    <testOrLive>LIVE</testOrLive>

    <primaryIssuer>
        <cik>0000715579</cik>
        <entityName>ACNB CORP</entityName>
        <issuerAddress>
            <street1>16 LINCOLN SQUARE</street1>
            <city>GETTYSBURG</city>
            <stateOrCountry>PA</stateOrCountry>
            <stateOrCountryDescription>PENNSYLVANIA</stateOrCountryDescription>
            <zipCode>17325</zipCode>
        </issuerAddress>
        <issuerPhoneNumber>7173343161</issuerPhoneNumber>
        <jurisdictionOfInc>PENNSYLVANIA</jurisdictionOfInc>
        <issuerPreviousNameList>
            <value>None</value>
        </issuerPreviousNameList>
        <edgarPreviousNameList>
            <value>None</value>
        </edgarPreviousNameList>
        <entityType>Corporation</entityType>
        <yearOfInc>
            <overFiveYears>true</overFiveYears>
        </yearOfInc>
    </primaryIssuer>

    <relatedPersonsList>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>James</firstName>
                <middleName>P.</middleName>
                <lastName>Helt</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>16 Lincoln Square</street1>
                <street2>P.O. Box 3129</street2>
                <city>Gettysburg</city>
                <stateOrCountry>PA</stateOrCountry>
                <stateOrCountryDescription>PENNSYLVANIA</stateOrCountryDescription>
                <zipCode>17325</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>President &amp; CEO</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Brett</firstName>
                <middleName>D.</middleName>
                <lastName>Fulk</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>16 Lincoln Square</street1>
                <street2>P.O. Box 3129</street2>
                <city>Gettysburg</city>
                <stateOrCountry>PA</stateOrCountry>
                <stateOrCountryDescription>PENNSYLVANIA</stateOrCountryDescription>
                <zipCode>17325</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>EVP/Chief Strategy Officer</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Laurie</firstName>
                <middleName>A.</middleName>
                <lastName>Laub</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>16 Lincoln Square</street1>
                <street2>P.O. Box 3129</street2>
                <city>Gettysburg</city>
                <stateOrCountry>PA</stateOrCountry>
                <stateOrCountryDescription>PENNSYLVANIA</stateOrCountryDescription>
                <zipCode>17325</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>EVP/Chief Credit Officer of ACNB Bank</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Douglas</firstName>
                <middleName>A.</middleName>
                <lastName>Seibel</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>16 Lincoln Square</street1>
                <street2>P.O. Box 3129</street2>
                <city>Gettysburg</city>
                <stateOrCountry>PA</stateOrCountry>
                <stateOrCountryDescription>PENNSYLVANIA</stateOrCountryDescription>
                <zipCode>17325</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>EVP/Chief Lending Officer of ACNB Bank</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Jason</firstName>
                <lastName>Weber</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>16 Lincoln Square</street1>
                <street2>P.O. Box 3129</street2>
                <city>Gettysburg</city>
                <stateOrCountry>PA</stateOrCountry>
                <stateOrCountryDescription>PENNSYLVANIA</stateOrCountryDescription>
                <zipCode>17325</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>EVP/CFO &amp; Treasurer</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Emily</firstName>
                <middleName>E.</middleName>
                <lastName>Berwager</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>16 Lincoln Square</street1>
                <street2>P.O. Box 3129</street2>
                <city>Gettysburg</city>
                <stateOrCountry>PA</stateOrCountry>
                <stateOrCountryDescription>PENNSYLVANIA</stateOrCountryDescription>
                <zipCode>17325</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>SVP/Chief Human Resources Officer of ACNB Bank</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Andrew</firstName>
                <middleName>A.</middleName>
                <lastName>Bradley</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>16 Lincoln Square</street1>
                <street2>P.O. Box 3129</street2>
                <city>Gettysburg</city>
                <stateOrCountry>PA</stateOrCountry>
                <stateOrCountryDescription>PENNSYLVANIA</stateOrCountryDescription>
                <zipCode>17325</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>SVP/Chief Risk Officer of ACNB Bank</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Kevin</firstName>
                <middleName>J.</middleName>
                <lastName>Hayes</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>16 Lincoln Square</street1>
                <street2>P.O. Box 3129</street2>
                <city>Gettysburg</city>
                <stateOrCountry>PA</stateOrCountry>
                <stateOrCountryDescription>PENNSYLVANIA</stateOrCountryDescription>
                <zipCode>17325</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>SVP/General Counsel &amp; Secretary</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Elizabeth</firstName>
                <middleName>F.</middleName>
                <lastName>Carson</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>16 Lincoln Square</street1>
                <street2>P.O. Box 3129</street2>
                <city>Gettysburg</city>
                <stateOrCountry>PA</stateOrCountry>
                <stateOrCountryDescription>PENNSYLVANIA</stateOrCountryDescription>
                <zipCode>17325</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Kimberly</firstName>
                <middleName>S.</middleName>
                <lastName>Chaney</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>16 Lincoln Square</street1>
                <city>Gettysburg</city>
                <stateOrCountry>PA</stateOrCountry>
                <stateOrCountryDescription>PENNSYLVANIA</stateOrCountryDescription>
                <zipCode>17325</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Alexandra</firstName>
                <middleName>C.</middleName>
                <lastName>Chiaruttini</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>16 Lincoln Square</street1>
                <city>Gettysburg</city>
                <stateOrCountry>PA</stateOrCountry>
                <stateOrCountryDescription>PENNSYLVANIA</stateOrCountryDescription>
                <zipCode>17325</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Eugene</firstName>
                <middleName>J.</middleName>
                <lastName>Draganosky</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>16 Lincoln Square</street1>
                <city>Gettysburg</city>
                <stateOrCountry>PA</stateOrCountry>
                <stateOrCountryDescription>PENNSYLVANIA</stateOrCountryDescription>
                <zipCode>17325</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Frank</firstName>
                <lastName>Elsner, III</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>16 Lincoln Square</street1>
                <city>Gettysburg</city>
                <stateOrCountry>PA</stateOrCountry>
                <stateOrCountryDescription>PENNSYLVANIA</stateOrCountryDescription>
                <zipCode>17325</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Todd</firstName>
                <middleName>L.</middleName>
                <lastName>Herring</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>16 Lincoln Square</street1>
                <city>Gettysburg</city>
                <stateOrCountry>PA</stateOrCountry>
                <stateOrCountryDescription>PENNSYLVANIA</stateOrCountryDescription>
                <zipCode>17325</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Scott</firstName>
                <middleName>L.</middleName>
                <lastName>Kelley</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>16 Lincoln Square</street1>
                <city>Gettysburg</city>
                <stateOrCountry>PA</stateOrCountry>
                <stateOrCountryDescription>PENNSYLVANIA</stateOrCountryDescription>
                <zipCode>17325</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>James</firstName>
                <middleName>J.</middleName>
                <lastName>Lott</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>16 Lincoln Square</street1>
                <city>Gettysburg</city>
                <stateOrCountry>PA</stateOrCountry>
                <stateOrCountryDescription>PENNSYLVANIA</stateOrCountryDescription>
                <zipCode>17325</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Donna</firstName>
                <middleName>M.</middleName>
                <lastName>Newell</lastName>
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            <relatedPersonAddress>
                <street1>16 Lincoln Square</street1>
                <city>Gettysburg</city>
                <stateOrCountry>PA</stateOrCountry>
                <stateOrCountryDescription>PENNSYLVANIA</stateOrCountryDescription>
                <zipCode>17019</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
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        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>John</firstName>
                <middleName>M.</middleName>
                <lastName>Polli</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>16 Lincoln Square</street1>
                <city>Gettysburg</city>
                <stateOrCountry>PA</stateOrCountry>
                <stateOrCountryDescription>PENNSYLVANIA</stateOrCountryDescription>
                <zipCode>17325</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Daniel</firstName>
                <middleName>W.</middleName>
                <lastName>Potts</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>16 Lincoln Square</street1>
                <city>Gettysburg</city>
                <stateOrCountry>PA</stateOrCountry>
                <stateOrCountryDescription>PENNSYLVANIA</stateOrCountryDescription>
                <zipCode>17325</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Donald</firstName>
                <middleName>Arthur</middleName>
                <lastName>Seibel, Jr.</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>16 Lincoln Square</street1>
                <city>Gettysburg</city>
                <stateOrCountry>PA</stateOrCountry>
                <stateOrCountryDescription>PENNSYLVANIA</stateOrCountryDescription>
                <zipCode>17325</zipCode>
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            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Alan</firstName>
                <middleName>J.</middleName>
                <lastName>Stock</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>16 Lincoln Square</street1>
                <city>Gettysburg</city>
                <stateOrCountry>PA</stateOrCountry>
                <stateOrCountryDescription>PENNSYLVANIA</stateOrCountryDescription>
                <zipCode>17325</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Chair of the Board</relationshipClarification>
        </relatedPersonInfo>
    </relatedPersonsList>

    <offeringData>
        <industryGroup>
            <industryGroupType>Commercial Banking</industryGroupType>
        </industryGroup>
        <issuerSize>
            <revenueRange>Over $100,000,000</revenueRange>
        </issuerSize>
        <federalExemptionsExclusions>
            <item>06b</item>
        </federalExemptionsExclusions>
        <typeOfFiling>
            <newOrAmendment>
                <isAmendment>false</isAmendment>
            </newOrAmendment>
            <dateOfFirstSale>
                <value>2026-03-12</value>
            </dateOfFirstSale>
        </typeOfFiling>
        <durationOfOffering>
            <moreThanOneYear>false</moreThanOneYear>
        </durationOfOffering>
        <typesOfSecuritiesOffered>
            <isDebtType>true</isDebtType>
        </typesOfSecuritiesOffered>
        <businessCombinationTransaction>
            <isBusinessCombinationTransaction>false</isBusinessCombinationTransaction>
            <clarificationOfResponse></clarificationOfResponse>
        </businessCombinationTransaction>
        <minimumInvestmentAccepted>100000</minimumInvestmentAccepted>
        <salesCompensationList>
            <recipient>
                <recipientName>Piper Sandler &amp; Co.</recipientName>
                <recipientCRDNumber>665</recipientCRDNumber>
                <associatedBDName>None</associatedBDName>
                <associatedBDCRDNumber>None</associatedBDCRDNumber>
                <recipientAddress>
                    <street1>1251 Avenue of the Americas</street1>
                    <street2>6th Floor</street2>
                    <city>New York</city>
                    <stateOrCountry>NY</stateOrCountry>
                    <stateOrCountryDescription>NEW YORK</stateOrCountryDescription>
                    <zipCode>10020</zipCode>
                </recipientAddress>
                <statesOfSolicitationList>
                    <state>AL</state>
                    <description>ALABAMA</description>
                    <state>CA</state>
                    <description>CALIFORNIA</description>
                    <state>CT</state>
                    <description>CONNECTICUT</description>
                    <state>GA</state>
                    <description>GEORGIA</description>
                    <state>IA</state>
                    <description>IOWA</description>
                    <state>KS</state>
                    <description>KANSAS</description>
                    <state>ME</state>
                    <description>MAINE</description>
                    <state>MD</state>
                    <description>MARYLAND</description>
                    <state>MI</state>
                    <description>MICHIGAN</description>
                    <state>MN</state>
                    <description>MINNESOTA</description>
                    <state>MO</state>
                    <description>MISSOURI</description>
                    <state>MT</state>
                    <description>MONTANA</description>
                    <state>NJ</state>
                    <description>NEW JERSEY</description>
                    <state>NY</state>
                    <description>NEW YORK</description>
                    <state>NC</state>
                    <description>NORTH CAROLINA</description>
                    <state>OH</state>
                    <description>OHIO</description>
                    <state>PA</state>
                    <description>PENNSYLVANIA</description>
                    <state>TN</state>
                    <description>TENNESSEE</description>
                    <state>VA</state>
                    <description>VIRGINIA</description>
                    <state>WA</state>
                    <description>WASHINGTON</description>
                    <state>WV</state>
                    <description>WEST VIRGINIA</description>
                </statesOfSolicitationList>
                <foreignSolicitation>false</foreignSolicitation>
            </recipient>
        </salesCompensationList>
        <offeringSalesAmounts>
            <totalOfferingAmount>15000000</totalOfferingAmount>
            <totalAmountSold>15000000</totalAmountSold>
            <totalRemaining>0</totalRemaining>
            <clarificationOfResponse></clarificationOfResponse>
        </offeringSalesAmounts>
        <investors>
            <hasNonAccreditedInvestors>false</hasNonAccreditedInvestors>
            <totalNumberAlreadyInvested>13</totalNumberAlreadyInvested>
        </investors>
        <salesCommissionsFindersFees>
            <salesCommissions>
                <dollarAmount>412500</dollarAmount>
                <isEstimate>true</isEstimate>
            </salesCommissions>
            <findersFees>
                <dollarAmount>0</dollarAmount>
            </findersFees>
            <clarificationOfResponse></clarificationOfResponse>
        </salesCommissionsFindersFees>
        <useOfProceeds>
            <grossProceedsUsed>
                <dollarAmount>0</dollarAmount>
            </grossProceedsUsed>
            <clarificationOfResponse></clarificationOfResponse>
        </useOfProceeds>
        <signatureBlock>
            <authorizedRepresentative>false</authorizedRepresentative>
            <signature>
                <issuerName>ACNB CORP</issuerName>
                <signatureName>Kevin J. Hayes</signatureName>
                <nameOfSigner>Kevin J. Hayes</nameOfSigner>
                <signatureTitle>Secretary &amp; General Counsel</signatureTitle>
                <signatureDate>2026-03-19</signatureDate>
            </signature>
        </signatureBlock>
    </offeringData>
</edgarSubmission>