EXHIBIT 32.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER
PURSUANT TO 18 U.S.C. SECTION 1350

In connection with the Quarterly Report of ACNB Corporation (the “Company”) on Form 10-Q for the period ending March 31, 2009, as filed with the Securities and Exchange Commission (the “Report”), I, Thomas A. Ritter, President & Chief Executive Officer, certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

1.The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and,

2.The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company as of the dates and for the periods expressed in the Report.

	By:	/s/ Thomas A. Ritter
		Thomas A. Ritter
		President & Chief Executive Officer
Date: May 8, 2009

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