Jean-Paul Belmondo

Rocco

Lino Ventura

Hervé Marec, aka 'Le plouc'

Bernard Blier

Mitch-Mitch

Andréa Parisy

Pepa

Gert Fröbe

Castigliano, aka 'La betterave'

Reginald Kernan

John Steiner aka Peter Frocht

Pierre Mirat

Halibi, aka 'Le sourdingue'

Doudou Babet

Khenouche, waiter at Halibi

Anne-Marie Coffinet

Angèle Bameste

Pierre Collet

Worker at Castigliano

Louis Bugette

Orlando, bar owner

Christian Brocard

Plouc's Mechanic

Paul Bonifas

Doctor Magnart, former professor in Lyon

Henri Lambert

Robert, client at Orlando (uncredited)

Marcel Bernier

Marcel, mechanic at Castigliano (uncredited)

Georges Aminel

Castigliano, aka 'La betterave' (voice) (uncredited)