Exhibit 23.1
Consent of Independent Registered Public Accounting Firm
We consent to the reference to our firm under the caption “Experts” in the Registration Statement (FormS-3) and related Prospectus of F.N.B. Corporation for the registration of 4,000,000 shares of its common stock and to the incorporation by reference therein of our reports dated February 28, 2018 with respect to the consolidated financial statements of F.N.B. Corporation and subsidiaries, and the effectiveness of internal control over financial reporting of F.N.B. Corporation and subsidiaries, included in its Annual Report (Form10-K) for the year ended December 31, 2017, filed with the Securities and Exchange Commission.
/s/ Ernst & Young LLP
Pittsburgh, Pennsylvania
March 2, 2018
