EXHIBIT 23

Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in the following Registration Statements and the related Prospectuses of Regions Financial Corporation, of our reports dated February 22, 2019, with respect to the consolidated financial statements of Regions Financial Corporation and subsidiaries, and the effectiveness of internal control over financial reporting of Regions Financial Corporation and subsidiaries, included in this Annual Report (Form 10-K) for the year ended December 31, 2018:

Form S-8 No. 333-135604 pertaining to the stock options and other equity interests issuable under the Regions Financial Corporation 2006 Long-Term Incentive Plan.

Form S-8 No. 333-138460 pertaining to the stock options and other equity interests issued, issuable, or assumed under:

AmSouth Bancorporation 2006 Long Term Incentive Compensation Plan

AmSouth Bancorporation 1996 Long Term Incentive Compensation Plan

First American Corporation 1999 Broad-Based Employee Stock Option Plan

Deposit Guaranty Corporation Long Term Incentive Plans

First American Corporation 1991 Employee Stock Incentive Plan

AmSouth Bancorporation Amended and Restated 1991 Employee Stock Incentive Plan

Pioneer Bancshares, Inc. Long Term Incentive Plan

AmSouth Bancorporation Stock Option Plan for Outside Directors

AmSouth Bancorporation Thrift Plan

AmSouth Bancorporation Deferred Compensation Plan and Amended and Restated Deferred Compensation Plan for Directors of AmSouth Bancorporation

AmSouth Bancorporation Employee Stock Purchase Plan

Form S-8 No. 333-117272 pertaining to the stock options and other equity interests issued, issuable, or assumed under:

Regions Financial Corporation 1999 Long-Term Incentive Plan

Regions Financial Corporation Amended and Restated 1991 Long-Term Incentive Plan

Regions Financial Corporation Amended and Restated Directors’ Stock Incentive Plan

Regions Financial Corporation 401(k) Plan

Regions Financial Corporation Supplemental 401(k) Plan

First Alabama Bancshares, Inc. 1988 Stock Option Plan

Union Planters Corporation 1998 Stock Incentive Plan for Officers and Employees

Union Planters Corporation Amended and Restated 1992 Stock Incentive Plan

Union Planters Corporation 401(k) Retirement Savings Plan

Union Planters Corporation Amended and Restated 1996 Deferred Compensation Plan For Executives

Form S-3 No. 333-124337 pertaining to the registration of $2,000,000,000 debt and equity securities.

Form S-3 No. 333-126797 pertaining to the securities registered on Form S-3 No. 333-124337.

Form S-3 ASR No. 333-142839 pertaining to the registration of debt and equity securities.

Form S-8 No. 333-161603 pertaining to common stock in connection with various employee benefit plans and other equity interests issued, issuable, or assumed under:

AmSouth Bancorporation 2006 Long Term Incentive Compensation Plan

AmSouth Bancorporation 1996 Long Term Incentive Compensation Plan

First American Corporation 1999 Broad-Based Employee Stock Option Plan

Deposit Guaranty Corporation Long Term Incentive Plans

First American Corporation 1991 Employee Stock Incentive Plan

AmSouth Bancorporation Amended and Restated 1991 Employee Stock Incentive Plan

AmSouth Bancorporation Stock Option Plan for Outside Directors

Regions Financial Corporation 401(k) Plan (formerly AmSouth Bancorporation Thrift Plan)

AmSouth Bancorporation Deferred Compensation Plan and Amended and Restated Deferred Compensation Plan for Directors of AmSouth Bancorporation

AmSouth Bancorporation Employee Stock Purchase Plan

Form S-3 ASR No. 333-165056 pertaining to the registration of debt and equity securities.

Form S-8 No. 333-166924 pertaining to the stock options and other equity interests issuable under the Regions Financial Corporation 2010 Long Term Incentive Plan.

Form S-3 ASR No. 333-186811 pertaining to the registration of debt and equity securities.

Form S-8 No. 333-203597 pertaining to common stock and other equity interests issuable under the Regions Financial Corporation 2015 Long Term Incentive Plan.

Form S-3 ASR No. 333-209657 pertaining to the registration of debt and equity securities.

Form S-8 No. 333-216230 pertaining to common stock issuable under the Regions Financial Corporation 401(k) Plan.

Birmingham, Alabama

February 22, 2019