4 mosche di velluto grigio
- Taon: 1971
- Bansa: France, Italy
- Genre: Thriller, Mystery, Horror
- Studio: Universal Productions France S.A., Seda Spettacoli
- Keyword: photographer, blackmail, claustrophobia, decapitation, male homosexuality, serial killer, whodunit, giallo
- Direktor: Dario Argento
- Cast: Michael Brandon, Mimsy Farmer, Jean-Pierre Marielle, Aldo Bufi Landi, Calisto Calisti, Marisa Fabbri