Le Cerveau

Jean-Paul Belmondo Arthur Lespinasse

Bourvil Anatole

David Niven Colonnel Carol Matthews, Aka 'Le Cerveau'

Eli Wallach Frankie Scannapieco, Godfather of the Italian Mafia

Silvia Monti Sofia Scannapieco, Frankie's Sister

Raymond Gérôme Commissioner

Fernand Guiot Inspector Mazurel, Assistant to the Commissioner

Jacques Balutin Inspector Pochet

Jacques Ciron Inspector Dubœuf

Patrick Préjean Belgian Sergeant of the Armoured Car

Robert Dalban Belgian Soldier of the Armored Car (With a Cold)

Raoul Delfosse Belgian Soldier of the Armored Car