TrustCo Bank Corp NY (TRST) 10-Q 2023 Q2 Quarterly report

Exhibit 15

August 8, 2023

Securities and Exchange Commission

450 Fifth Street, NW

Washington, DC 20549

RE: FILING OF THE JUNE 30, 2023 FORM 10-Q FOR TRUSTCO BANK CORP NY

Commissioners:

We are aware that our report dated August 8, 2023, on our reviews of the interim financial information of TrustCo Bank Corp NY as of June 30, 2023 and for the three and six-month periods ended June 30, 2023 and 2022, included in the Company’s quarterly report on Form 10-Q for the quarter ended June 30, 2023, is incorporated by reference in its Registration Statements, Form S-8 (No. 333-175868), Form S-8 (No. 333-233122), Form S-8 (No. 333-175867), Form S-8 (No. 333-206685), Form S-8 (333-272169), Form S-3 (No. 333-238208) and Form S-3 (333-272184).

Yours very truly,

/s/ Crowe LLP