EXHIBIT 23

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in the Registration Statements on Form S-8 (Nos. 333-22319, 333-59839,
333-56870, 333-57880, 333-134298 and 333-156649) of FactSet Research Systems Inc. of our report dated October 30, 2010 relating to the financial statements, financial statement schedule and the effectiveness of internal control over financial reporting, which appears in the Annual Report to Stockholders, which is incorporated in this Annual Report on Form 10-K.

/s/ PRICEWATERHOUSECOOPERS LLP

PricewaterhouseCoopers LLP

Stamford, Connecticut

October 29, 2010