Exhibit 23

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in the Registration Statements on Form S-8 (Nos. 333-162407, 333-174393 and 333-211776) of Select Medical Holdings Corporation of our report dated February 21, 2019, relating to the financial statements, financial statement schedule and the effectiveness of internal control over financial reporting, which appears in this Form 10-K. We also consent to the reference to us under the heading “Selected Financial Data” in this Form 10-K.

/s/ PricewaterhouseCoopers LLP

Harrisburg, PA

February 21, 2019