L'assassin habite au… 21
- annos singulos: 1942
- Patriam: France
- genus: Comedy, Mystery, Thriller
- Studio: Continental Films
- keyword: paris, france, based on novel or book, serial killer, boarding house, french noir, police inspector
- Director: Henri-Georges Clouzot
- cast: Pierre Fresnay, Suzy Delair, Jean Tissier, Pierre Larquey, Noël Roquevert, René Génin