| The Mysterious Monsieur Sylvain | |
| Director: | Jean Stelli |
| Music: | René Sylviano |
| Cinematography: | René Gaveau |
| Editing: | Claude Nicole |
| Studio: | Paris Production de Films |
| Distributor: | Consortium du Film |
| Runtime: | 95 minutes |
| Country: | France |
The Mysterious Monsieur Sylvain (French: Le mystérieux Monsieur Sylvain) is a 1947 French mystery film directed by Jean Stelli and starring Frank Villard, Simone Renant and Jean Chevrier.[1] It was shot at the Billancourt Studios in Paris with sets designed by the art director Emile Alex.
When an engineer at a naval base is murdered three different men turn up claiming to be Monsieur Sylvain, a detective assigned to the case.