NBT Bancorp (NBTB) S-4 Registration of securities issued in business combination transactions

Exhibit 23.4

Consent of Independent Registered Public Accounting Firm

We consent to the use of our reports dated March 1, 2022, with respect to the consolidated financial statements of NBT Bancorp Inc. and subsidiaries, and the effectiveness of internal control over financial reporting, incorporated herein by reference and to the reference to our firm under the heading “Experts” in the prospectus.

/s/ KPMG LLP

Albany, New York

February 13, 2023