Jean-Paul Belmondo

as Arthur Lespinasse

Bourvil

as Anatole

David Niven

as Colonnel Carol Matthews, Aka 'Le Cerveau'

Eli Wallach

as Frankie Scannapieco, Godfather of the Italian Mafia

Silvia Monti

as Sofia Scannapieco, Frankie's Sister

Raymond Gérôme

as Commissioner

Fernand Guiot

as Inspector Mazurel, Assistant to the Commissioner

Jacques Balutin

as Inspector Pochet