The César Award for Best Actress in a Supporting Role (French: César du meilleur second rôle masculin) is one of the César Awards, presented annually by the Académie des Arts et Techniques du Cinéma to recognize the outstanding performance in a supporting role of an actor who has worked within the French film industry during the year preceding the ceremony. Nominees and winner are selected via a run-off voting by all the members of the Académie.
The following individuals received two or more Best Supporting Actor awards:
The following individuals received three or more Best Supporting Actor nominations: