EXHIBIT 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We have issued our reports dated May 20, 2005, accompanying the consolidated financial statements and schedule and management’s assessment of the effectiveness of internal control over financial reporting included in the Annual Report of Rentrak Corporation on Form 10-K for the year ended March 31, 2005.  We hereby consent to the incorporation by reference of said report in the Registration Statements of Rentrak Corporation on Forms S-8 (File Nos. 33-44865, 333-28565, 333-39021, 333-62523, 333-110781 and
333-110782).

/s/ Grant Thornton LLP

Portland, Oregon

June 13, 2005