Jean-Paul Belmondo
Role: Arthur Lespinasse
David Niven
Role: Colonnel Carol Matthews, aka 'Le Cerveau'
Eli Wallach
Role: Frankie Scannapieco, godfather of the Italian mafia
Silvia Monti
Role: Sofia Scannapieco, Frankie's sister
Raymond Gérôme
Role: Commissioner
Fernand Guiot
Role: Inspector Mazurel, assistant to the commissioner
Jacques Balutin
Role: Inspector Pochet
Jacques Ciron
Role: Inspector Dubœuf
Patrick Préjean
Role: Belgian Sergeant of the armoured car
Robert Dalban
Role: Belgian soldier of the armored car (with a cold)
Raoul Delfosse
Role: Belgian soldier of the armored car
Roland Monk
Role: Belgian soldier of the armored car
Mario David
Role: Jean-François, antique dealer in Le Havre
Henri Génès
Role: Chief warden of Poissy prison
Yves Barsacq
Role: Warden of Poissy prison
Dominique Zardi
Role: Warden of Poissy prison
Max Montavon
Role: Antique dealer in Le Havre, Jean-François’ partner
Paul Mercey
Role: André, the flooded owner of the 5th floor
Henri Attal
Role: Member of the Colonel's gang
Tommy Duggan
Role: Superintendent Cummings
Sophie Grimaldi
Role: Blonde on the train
Roger Lumont
Role: Boss of the shop
John Rico
Role: Member of the Italian mafia
Arch Taylor
Role: Member of the Italian mafia
Pierre Tornade
Role: Belgian Soldier in Armored Car (uncredited)
Micha Bayard
Role: André's Wife (uncredited)
Gérard Hernandez
Role: Policeman in Le Havre (uncredited)
César Torres
Role: (uncredited)
Yvon Dihé
Role: (uncredited)