FactSet Research Systems (FDS) 8-K/A Completion of Acquisition or Disposition of Assets

Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in the Registration Statementof FactSet Research Systems Inc. on Form S-8 (Nos. 333-201498, 333-171667, 333-156649, 333-59839, 333-56870, and 333-22319) of our reportdated March 31, 2015, on our audit ofthe consolidated financialstatements of Portware, LLC and Subsidiaries as of December 31, 2014, which report is included in this Form 8-K/A.

/s/ EISNERAMPER LLP

New York, New York

December 30, 2015