EXHIBIT 23.0

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CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

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We hereby consent to the incorporation by reference in the Registration Statement on Form S-8 (No. 333-262368) of Catalyst Bancorp, Inc. of our report dated March 29, 2022, relating to the consolidated financial statements of Catalyst Bancorp, Inc included in Catalyst Bancorp Inc.’s Annual Report on Form 10-K for the year ended December 31, 2021.

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/s/ Castaing, Hussey & Lolan, LLC

New Iberia, Louisiana

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Date: March 29, 2022