- Country: France, Italy
- Genres: Drama, Thriller
- Release: 1977-12-23
- Director: Steno
- Writers: Agenore Incrocci , Ugo Moretti , Furio Scarpelli , Steno
- Language: Italian
- Stars: Marcello Mastroianni , Agostina Belli , Ursula Andress , Peter Ustinov , Jean-Claude Brialy , Mario Scaccia , Gianfranco Barra , Giuseppe Anatrelli , Serge Frédéric , Jean-Patrick Junoy
- Runtime: 120 min
- Awards: N/A
- AKA: Dviguba žmogžudyste (Lithuania) , Doble asesinato (Spain) , Doble asesinato (Argentina) , Doppelmord in Rom , Double Murder (Canada) , Doppio delitto , Doble asesinato (Mexico) , 2 x mord (Sweden) , Duplo Crime na Roma Antiga (Portugal, Portuguese Republic) , Vom Blitz getroffen , Double Murder (United States of America) , Double Murder (United Kingdom) , Kettős gyilkosság (Hungary) , Double Murder , Kaksois murha (Finland) , Enquête à l'italienne (France, French Republic) , Dipli dolofonia (Greece) , Duplo Assassinato (Brazil) , Podwójne morderstwo (Poland)
- Plot: A police commissioner and a political activist join to investigate the suspicious death of a playboy Prince.
- IMDB:tt0077459
Double Murder Cast · · · ALL
Steno
Director
Marcello Mastroianni
Bruno Baldassarre
Agostina Belli
Teresa Colasanti
Ursula Andress
Princess Anna Dell'Orso
Peter Ustinov
Harry Hellman
Jean-Claude Brialy
Van Nijlen
Mario Scaccia
Marino Cianciarelli
Gianfranco Barra
Cantalamessa
Giuseppe Anatrelli
Carru
Luigi Zerbinati
The 'Debosciato', nephew of Prince Dell'Orso
Nando Paone
Conductor
Jimmy il Fenomeno
Protester (uncredited)