Exhibit 23

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We have issued our reports dated March 3, 2006, accompanying the consolidated financial statements and management’s assessment of the effectiveness of internal control over financial reporting included in the 2005 Annual Report of Harleysville National Corporation on Form 10-K for the year ended December 31, 2005. We hereby consent to the incorporation by reference of said report in the Registration Statements of Harleysville National Corporation on Forms S-8 (File No. 33-69784, effective October 1, 1993, File No. 333-17813, effective December 13, 1996, File No. 333-79971, effective June 4, 1999, and File No. 333-79973, effective June 4, 1999, File No. 333-116183, effective June 4, 2004).

/s/ Grant Thornton LLP
Philadelphia, Pennsylvania
March 3, 2006