EXHIBIT 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in the Registration Statements on Forms S-8 (Nos. 33-14706, 33-32622, 33-32623, 33-39187, 33-39204, 33-40795, 33-52617, 33-56639, 33-56641, 33-57763, 33-62138, 33-62140, 33-65401, 33-65403, 333-05743, 333-05745, 333-18283, 333-18339, 333-38786, 333-38820, 333-42471, 333-42573, 333-42343, 333-42269, 333-50068, 333-50094, 333-66038, 333-66042, 333-68193, 333-68135, 333-68273, 333-75694, 333-79793, 333-79829, 333-88001, 333-91173, 333-91151, 333-91167, 333-98737 and 333-125044) of Robert Half International Inc. of our report dated February 22, 2007, relating to the consolidated financial statements, financial statement schedule, management’s assessment of the effectiveness of internal control over financial reporting and the effectiveness of internal control over financial reporting, which appears in this Form 10-K.

/s/ PricewaterhouseCoopers LLP

San Francisco, California

February 22, 2007