UNITED STATES SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549
                                    FORM 8-K

                     PURSUANT TO SECTION 13 OR 15(d) OF THE
                         SECURITIES EXCHANGE ACT OF 1934

                        Date of Report: December 18, 2003

                                ACNB CORPORATION
            --------------------------------------------------------
            (Exact name of registrant's as specified in its charter)

       PENNSYLVANIA                   0-11783                    23-2233457
(State or other jurisdiction     (Commission File #)        (I.R.S. Employer
 of incorporation)                                          Identification No.)

16 LINCOLN SQUARE, GETTYSBURG, PA                    17325
- --------------------------------------------------------------------------------
(Address of principal executive offices)           (Zip Code)

                                 (717) 334-3161
- --------------------------------------------------------------------------------
              (Registrant's telephone number, including area code)

Item 4.  Changes in Registrant's Certifying Accountant

Item 7.  Financial Statements, Pro Forma Financial Information and Exhibits






                                ACNB CORPORATION

                                    FORM 8-K

ITEM 4.  CHANGES IN REGISTRANT'S CERTIFYING ACCOUNTANT

On October 8, 2003, Stambaugh Ness, PC, the Registrant's principal accountants,
notified the Registrant that it will decline to stand for appointment after
completion of the current audit for calendar year 2003. Services to be provided
by Stambaugh Ness, PC through the end of the calendar year 2003 included the
interim review for the third quarter ended September 30, 2003. Stambaugh Ness,
PC, has chosen not to continue to provide independent auditing services to
companies who report to the Securities and Exchange Commission. Stambaugh Ness,
PC, will provide a letter of final resignation in 2004.

On December 11, 2003, the Audit Committee of the Registrant's Board of Directors
voted to engage Beard Miller Company, LLP, as principal accountants to replace
Stambaugh Ness, PC. The change will become effective for the 2004 year end audit
including interim reviews commencing with the first quarter ending March 31,
2004.

In connection with audits of the two fiscal years ended December 31, 2002, and
subsequent interim periods through October 8, 2003, there were no disagreements
with Stambaugh Ness, PC, on any matter of accounting principles or practices,
financial statement disclosure, or auditing scope or procedures, which
disagreements if not resolved to Stambaugh Ness' satisfaction, would have caused
them to make reference to the subject matter of the disagreement in connection
with its report.

The audit reports of Stambaugh Ness, PC, on the financial statements of ACNB
Corporation as of and for the years ended December 31, 2002 and 2001, did not
contain any adverse opinion or disclaimer of opinion, nor were they qualified or
modified as to uncertainty, audit scope, or accounting principles. We have
provided Stambaugh Ness, PC, with a copy of the foregoing disclosures. Attached
as Exhibit 16.1 is a copy of Stambaugh Ness' letter dated December 18, 2003,
stating that it has found no basis for disagreement with such statements.

During the years ended December 31, 2002 and 2001 and the subsequent interim
periods through the date of this Form 8-K, neither the registrant nor anyone on
its behalf consulted Beard Miller Company LLP on any matters or reportable
events listed in Item 304 (a) (2) (i) and (ii).







ITEM 7.  FINANCIAL STATEMENTS, PRO FORMA FINANCIAL INFORMATION AND EXHIBITS

         (a)      Financial Statements of Businesses Acquired None

         (b)      Pro Forma Financial Information None

         (c)      Exhibits
                  16.1 - Letter Stambaugh Ness, PC, dated December 18, 2003









                                   SIGNATURES

         Pursuant to the requirements of the Securities and Exchange Act of
1934, the Registrant has duly caused this report to be signed on its behalf by
the undersigned hereunto duly authorized.

                                                     ACNB Corporation



                                                  By: /s/ Ronald L. Hankey
                                                      -------------------------
                                                      Ronald L. Hankey
                                                      Chairman of the Board/CEO


Dated:  December 18, 2003