The Mysterious Monsieur Sylvain
Directed by	Jean Stelli
Written by	Marc-Gilbert Sauvajon Solange Térac
Starring	Frank Villard Simone Renant Jean Chevrier
Cinematography	René Gaveau
Edited by	Claude Nicole
Music by	René Sylviano
Production company	Paris Production de Films
Distributed by	Consortium du Film
Release date	16 April 1947 (1947-04-16)
Running time	95 minutes
Country	France
Language	French

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.

• Frank Villard as Ancelin
• Simone Renant as Françoise Dastier
• Jean Chevrier as Chantenay
• Jean Marchat as Morgat
• Marcelle Praince as La marquise
• André Bervil as Le tueur
• Marcel Raine as Le commandant Dartois
• Paul Amiot as Le colonel
• Claude Nollier
• Suzanne Bara
• Roger Bontemps
• Max Doria
• Jacques Mattler
• Jacques Muller
• Roger Coirault
• Maud Lamy

• Rège, Philippe. Encyclopedia of French Film Directors, Volume 1. Scarecrow Press, 2009.

• The Mysterious Monsieur Sylvain at IMDb