EXHIBIT 15

Acknowledgment of Independent Registered Public Accounting Firm

August 2, 2023

To the Shareholders and Board of Directors of KeyCorp

We are aware of the incorporation by reference in the following Registration Statements (including all amendments thereto) of KeyCorp:

Form S-3 No. 333-55959        

Form S-3 No. 333-59175        

Form S-3 No. 333-64601        

Form S-3 No. 333-76619            

Form S-3 No. 333-272573

Form S-8 No. 333-49609        

Form S-8 No. 333-70669                                

Form S-8 No. 333-107074        

Form S-8 No. 333-107075        

Form S-8 No. 333-107076

Form S-8 No. 333-256086                

Form S-8 No. 333-112225                

Form S-8 No. 333-167093        

Form S-8 No. 333-188703

Form S-8 No. 333-208272

Form S-8 No. 333-231689

Form S-8 No. 333-271833

of our review report dated August 2, 2023 relating to the unaudited consolidated interim financial statements of KeyCorp that are included in its Form 10-Q for the quarter ended June 30, 2023.

Cleveland, Ohio