- Country: Italy
- Genres: Horror
- Release: 1964-06-30
- Director: Renato Polselli
- Writers: Renato Polselli , Ernesto Gastaldi , Giuseppe Pellegrini
- Language: Italian
- Stars: Marco Mariani , Giuseppe Addobbati , Barbara Hawards , Alberto Archetti , Carla Cavalli , Aldo Nicodemi , Jody Excell , George Arms , Gaby Black , Romy von Simon
- Runtime: 84 min
- Awards: N/A
- AKA: The Monster of the Opera (Canada) , Il vampiro dell'opera (Italy) , Il mostro dell'opera (Italy) , Il mostro dell'opera , The Monster of the Opera (United States of America) , L'orgie des vampires (France, French Republic) , Vampire of the Opera (United States of America)
- Plot: A theater troupe's young, energetic leader has secured an old theater in which to produce his new production. The theater's elderly caretaker urges the group to leave at once. A vampire is awakened and discovers that one of the troupe is the reincarnation of the woman who he once loved.
- IMDB:tt0058377
The Monster of the Opera Cast · · · ALL
Renato Polselli
Director
Marco Mariani
Sandro
Giuseppe Addobbati
Stefano
Barbara Howard
Giulia
Alberto Archetti
Achille
Carla Cavalli
Aurora
Aldo Nicodemi
Man
Jody Excell
Yvette
Milena Vukotic
Carlotta
Renato Montalbano
Tony
Vittoria Prada
Rossana
Fidel Gonzáles
Filippo