L'assassin habite au… 21

Pierre Fresnay

Commissaire Wens

Suzy Delair

Mila Malou

Jean Tissier

Triquet

Pierre Larquey

Mr. Colin

Noël Roquevert

Dr. Linz

René Génin

Alfred

Jean Despeaux

Kid Robert

Marc Natol

Armand

Huguette Vivier

Nurse Vania

Odette Talazac

Madame Point

Maximilienne

Miss Cuq

Sylvette Saugé

Christiane

Louis Florencie

Commissaire Monnet

André Gabriello

Police Officer Pussot

Raymond Bussières

Turelot

Antoine Balpêtré

Albert (uncredited)

Paul Barge

Ernest (uncredited)

Léon Belières

Businessman (uncredited)

René Blancard

Inspector Picard (uncredited)

Lucien Blondeau

Police Prefect Edouard (uncredited)