Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in this Registration Statement on Form S-8 of Robert Half International, Inc. of our report dated February 15, 2019 relating to the financial statements, financial statement schedules and the effectiveness of internal control over financial reporting, which appears in Robert Half International, Inc.’s Annual Report on Form 10-K for the year ended December 31, 2018.

/s/ PricewaterhouseCoopers LLP

San Francisco, CA

May 29, 2019