EXHIBIT 23 PEOPLES BANCORP INC. ANNUAL REPORT ON FORM 10-K FOR FISCAL YEAR ENDED DECEMBER 31, 2001 CONSENT OF INDEPENDENT AUDITORS We consent to the incorporation by reference in the Registration Statements pertaining to the Peoples Bancorp Inc. Retirement Savings Plan (Form S-8, No. 33-1803), the Amended and Restated 1993 Stock Option Plan of Peoples Bancorp Inc. (Form S-8, No. 33-67878), the 1995 Stock Option Plan of Peoples Bancorp Inc. (Form S-8, No. 33-59569), the Deferred Compensation Plan for Directors of Peoples Bancorp Inc. and Subsidiaries (Form S-8, No. 333-43629), the 1998 Stock Option Plan of Peoples Bancorp Inc. (Form S-8, No. 333-62935), and the Peoples Bancorp Inc. Dividend Reinvestment Plan (Form S-3, No. 33-54003) of our report dated February 20, 2002, with respect to the consolidated financial statements of Peoples Bancorp Inc. and Subsidiaries included in this Annual Report on Form 10-K for the year ended December 31, 2001. /s/ ERNST & YOUNG LLP Ernst & Young LLP Charleston, West Virginia March 5, 2002