RMG Acquisition Corp. III (RMGCF) S-4 Registration of securities issued in business combination transactions

Exhibit 23.2

Consent of Independent Registered Public Accounting Firm

We consent to the use in this Registration Statement on Form S-4 of RMG Acquisition Corp. III of our report dated July 5, 2023, relating to the consolidated financial statements of H2B2 Electrolysis Technologies, Inc. appearing in the proxy statement/prospectus, which is part of this Registration Statement.

We also consent to the reference to our firm under the heading “Experts” in such proxy statement/prospectus.

/s/ RSM US LLP

Austin, Texas

July 6, 2023