Exhibit 23(a)

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in this Registration Statement on Form S-3 of M&T Bank Corporation of our report dated February 22, 2018 relating to the financial statements and the effectiveness of internal control over financial reporting, which appears in M&T Bank Corporation’s Annual Report on Form 10-K for the year ended December 31, 2017. We also consent to the reference to us under the heading “Experts” in such Registration Statement.

/s/ PricewaterhouseCoopers LLP

Buffalo, NY

October 1, 2018