 | Charles Denner als Henri Landru |
 | Michèle Morgan als Mme Buisson |
 | Danielle Darrieux als Mme Héon |
 | Hildegard Knef als German Widow |
 | Juliette Mayniel als Mme Collomb |
 | Stéphane Audran als Fernande Segret |
 | Catherine Rouvel als Mlle Babeley |
 | Françoise Lugagne als Catherine Landru |
 | Mary Marquet als Old Lady |
 | Denise Provence als Mme Lacoste |
 | Serge Bento als Maurice Landru |
 | Claude Mansard als Landru's Attorney |
 | Robert Burnier als Court President |
 | Mario David als Advocate General |
 | Jean-Louis Maury als Commissaire Belin |
 | Diane Lepvrier als Suzanne Landru |
 | Gisèle Sandré als Mireille |
 | Sacha Briquet als Prosecutor |
 | Raymond Queneau als Georges Clemenceau |
 | Jean-Pierre Melville als Clemenceau's Aide |
 | Pierre Vernier |
| René Pannetrat |
| Jacques Munier |
 | Louis Lyonnet |
| Pierre Lafont |
| Huguette Forge |
| Joseph Hindley |
| André Dino |
| André Fouché |
 | Bernard Papineau |
| Eric Muller |
| Robert Barre |
 | Philippe Castelli |
| Jean-Marie Arnoux |
| Jacques Robiolles |
| Alain Quercy |
 | Henri Attal |
 | Dominique Zardi |
| Claude Chabrol | Director |
| Françoise Sagan | Screenplay |
| Carlo Ponti | Producer |
| Pierre Jansen | Original Music Composer |
| Jean Rabier | Director of Photography |
| Jacques Gaillard | Editor |
| Jacques Saulnier | Production Design |
| Georges de Beauregard | Producer |
| Françoise Sagan | Dialogue |
| André Girard | Conductor |
| Monique Gaillard | Assistant Editor |
| Julien Coutellier | Sound Engineer |
| Maurice Albray | Costume Designer |
| Francis Cognany | Assistant Director |
| Jean Grouet | Assistant Director |
| Charles L. Bitsch | Assistant Director |
| Claude Laporte | Assistant Director |
| Alain Levent | Camera Operator |
| Claude Lidi | Assistant Camera |
| Michel Humeau | Assistant Camera |
| Georges Houssaye | Set Decoration |
| Raymond Cauchetier | Still Photographer |
| Suzon Faye | Script Supervisor |
| Joseph Gerhard | Property Master |
| Louis Bonnemaison | Makeup Artist |
| Maud Begon | Hairstylist |
| Victor Revelli | Boom Operator |
| Paul Durand | Sound Recordist |
| Clément Ollier | Production Manager |
| Roger Scipion | Production Manager |
| Bruna Drigo | Production Director |
