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                                            EXHIBIT 23.1    

Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in the following Registration Statements:

•Registration Statement on Form S-8 relating to the F.N.B. Corporation Progress Savings 401(k) Plan (File #333-185929)

•Registration Statement on Form S-8 relating to the F.N.B. Corporation 2022 Incentive Compensation Plan (File #333-279583 and #333-264898)

•Registration Statement on Form S-3ASR relating to F.N.B. Corporation Dividend Reinvestment and Direct Stock Purchase Plan (File #333-281869)

•Registration Statement on Form S-3ASR relating to the shelf registration of F.N.B. Corporation common stock, preferred stock, debt securities, depositary shares, warrants, purchase contracts, and units (File #333-281868)

•Registration Statement on Form S-3ASR relating to the registration of F.N.B. Corporation and FNB Financial Services, LP Subordinated Notes (File #333-281871-01)

•Registration Statement on Form S-8 relating to the F.N.B. Corporation Deferred Compensation Plan (File #333-264371)

of our reports dated February 24, 2026, with respect to the consolidated financial statements of F.N.B. Corporation and the effectiveness of internal control over financial reporting of F.N.B. Corporation included in this Annual Report (Form 10-K) of F.N.B. Corporation for the year ended December 31, 2025.

/s/ Ernst & Young LLP

Pittsburgh, Pennsylvania

February 24, 2026