Peoples Bancorp (PEBO) S-4/A Registration of securities issued in business combination transactions (amended)

Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

We consent to the reference to our firm under the caption “Experts” and to the use of our reports dated February 27, 2014, in Amendment No. 3 to the Registration Statement (Form S-4 No. 333-199152) and related Prospectus of Peoples Bancorp Inc. for the registration of 3,500,000 shares of its common stock.

/s/ Ernst & Young LLP

Charleston, WV

December 30, 2014