QuinStreet (QNST) S-8 Registration of securities for employees

Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in this Registration Statement onForm S-8 of our report dated September 8, 2017 relating to the consolidated financial statements, financial statement schedule and the effectiveness of internal control over financial reporting, which appears in QuinStreet, Inc.’s Annual Report on Form10-K for the year ended June 30, 2017.

/s/ PricewaterhouseCoopers LLP

San Jose, California

September 8, 2017