Exhibit 23.1

Consent of Independent Registered

Public Accounting Firm

We consent to the incorporation by reference in Registration Statements No. 333-32386 and No. 333-116163 on Form S-8 of Timberland Bancorp, Inc. of our report dated December 11, 2013, with respect to the consolidated financial statements of Timberland Bancorp, Inc. and Subsidiary (collectively, “Timberland”) included in Timberland’s Annual Report (Form 10-K) for the year ended September 30, 2013.

/s/ Delap LLP

Lake Oswego, Oregon

December 11, 2013