His appointment, which does not require Senate confirmation, means neither of the top two people running the agency has FBI experience.
Bongino, who has never served in the bureau, is a former NYPD officer and Secret Service agent.
The appointment of the far-right podcaster as a high-ranking marks the first time in the bureau’s history that the position has not been held by a senior agent.
Bongino will serve under newly-confirmed FBI director Kash Patel, a former defence department chief of staff and ex-federal prosecutor.