Exhibit 23.4
Consent of Independent Auditor
First American International Corp.
Brooklyn, New York
We hereby consent to the use in the Proxy Statement/Prospectus constituting a part of this Amendment No. 1 to the Registration Statement onForm S-4 (File No. 333-226299) of RBB Bancorp of our report dated March 9, 2018, relating to the consolidated financial statements of First American International Corp., which is contained in that Proxy Statement/Prospectus.
We also consent to the reference to us under the caption “Experts” in the Proxy Statement/Prospectus.
/s/ BDO USA, LLP
BDO USA, LLP
New York, New York
August 2, 2018