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

Roland Monk

Belgian soldier of the armored car

Mario David

Jean-François, antique dealer in Le Havre

Henri Génès

Chief warden of Poissy prison

Yves Barsacq

Warden of Poissy prison

Dominique Zardi

Warden of Poissy prison

Max Montavon

Antique dealer in Le Havre, Jean-François’ partner

Paul Mercey

André, the flooded owner of the 5th floor

Henri Attal

Member of the Colonel's gang

Tommy Duggan

Superintendent Cummings

Sophie Grimaldi

Blonde on the train

Roger Lumont

Boss of the shop

John Rico

Member of the Italian mafia

Arch Taylor

Member of the Italian mafia

Trevor A. Stephens

Pierre Tornade

Belgian Soldier in Armored Car (uncredited)

Micha Bayard

André's Wife (uncredited)

Gérard Hernandez

Policeman in Le Havre (uncredited)

César Torres

(uncredited)

Yvon Dihé

(uncredited)