Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

We consent to the reference to our firm under the caption “Experts” in Amendment No. 1 tothe Registration Statement (Form S-1No. 333-266956) and related Prospectus of Graybar Electric Company, Inc. for the registration of 2,000,000 shares of its common stock and to the incorporation by reference therein of our report dated March 10, 2022, with respect to the consolidated financial statements of Graybar Electric Company, Inc. included in its Annual Report (Form 10-K) for the year ended December 31, 2021, filed with the Securities and Exchange Commission.

/s/ Ernst & Young LLP

St. Louis, Missouri

October 25, 2022