A young opera singer is stalked by a deranged fan bent on killing the people associated with her to claim her for himself.
You can now watch Opera online on the following streaming providers in the United States.
| Lighting | Fernando Massaccesi | Gaffer |
| Sound | Romano Pampaloni | Sound Re-Recording Mixer |
| Sound | Luciano Anzellotti | Sound Effects |
| Directing | Cinzia Malatesta | Script Supervisor |
| Camera | Enrico Maggi | Camera Operator |
| Writing | Dario Argento | Screenplay |
| Costume & Make-Up | Francesca Grandi | Seamstress |
| Production | Paola Rossi | Production Secretary |
| Production | Enrico Lucherini | Publicist |
| Editing | Alessandro Gabriele | Assistant Editor |
| Camera | Nicola Pecorini | Steadicam Operator |
| Directing | Antonio Gabrielli | First Assistant Director |
| Costume & Make-Up | Lia Francesca Morandini | Costume Designer |
| Production | Davide Bassan | Production Designer |
| Production | Ferdinando Caputo | Executive Producer |
| Sound | Andrea Piccini | Vocals |
| Editing | Roberto Priori | Assistant Editor |
| Directing | Alessandro Ingargiola | Second Assistant Director |
| Sound | Claudio Simonetti | Original Music Composer |
| Crew | Roger Eno | Additional Music |
| Production | Renato Rinaldo | Accountant |
| Costume & Make-Up | Enrica Barbano | Wardrobe Assistant |
| Camera | Ennio Picconi | Key Grip |
| Sound | Stefano Rossi | Boom Operator |
| Art | Osvaldo Monaco | Property Master |
| Costume & Make-Up | Barbara Morosetti | Makeup Artist |
| Crew | Bill Wyman | Additional Music |
| Production | Vittorio Cecchi Gori | Co-Producer |
| Production | Egle Friggeri | Production Secretary |
| Sound | Gianfranco Plenizio | Music Consultant |
| Sound | Francesco Miracle | Music Consultant |
| Camera | Roberto Nicosia | Still Photographer |
| Camera | Maurizio Lucchini | Assistant Camera |
| Sound | Massimo Anzellotti | Sound Effects Editor |
| Art | Antonio Tarolla | Assistant Art Director |
| Production | Olivier Gérard | Unit Manager |
| Writing | Dario Argento | Story |
| Production | Carlo Du Bois | Accountant |
| Camera | Ugo Menegatti | Assistant Camera |
| Crew | Massimo Cristofanelli | Special Effects Technician |
| Sound | Federico Savina | Dolby Consultant |
| Production | Gian Maurizio Fercioni | Production Designer |
| Crew | Brian Eno | Additional Music |
| Editing | Piero Bozza | Assistant Editor |
| Crew | Germano Natali | Special Effects |
| Crew | Giovanni Corridori | Special Effects |
| Sound | Robert Rietti | ADR Supervisor |
| Directing | Dario Argento | Director |
| Crew | Renato Agostini | Special Effects |
| Sound | Nick Alexander | Sound Editor |
| Art | Claudio Stefani | Props |
| Art | Renato Lori | Assistant Art Director |
| Art | Maurizio Jacopelli | Property Master |
| Production | Fabrizio Diaz | Unit Manager |
| Camera | Ronnie Taylor | Director of Photography |
| Production | Federica Zappalà | Accountant |
| Production | Gianluca Pignatelli | Publicist |
| Production | Angelo Cavallo | Production Secretary |
| Camera | Franco Vitale | Still Photographer |
| Camera | Luca Robecchi | Second Unit Director of Photography |
| Directing | Paolo Zenatello | First Assistant Director |
| Directing | Michele Soavi | Second Unit Director |
| Costume & Make-Up | Angelo Vannella | Hairstylist |
| Editing | Franco Fraticelli | Editor |
| Sound | Steel Grave | Original Music Composer |
| Production | Dario Argento | Producer |
| Production | Francesco Marras | Production Secretary |
| Sound | Giovanni Veneri | Music Director |
| Sound | Paola Leolini | Vocals |
| Camera | Renato Tafuri | Second Unit Director of Photography |
| Camera | Antonio Scaramuzza | Camera Operator |
| Crew | Sergio Stivaletti | Animatronic and Prosthetic Effects |
| Production | Alessandro Calosci | Production Supervisor |
| Production | Mario Cecchi Gori | Co-Producer |
| Writing | Franco Ferrini | Screenplay |
| Crew | Maurizio Garrone | Animal Coordinator |
| Camera | Roberto de Franceschi | Clapper Loader |
| Sound | Giancarlo Laurenzi | Sound Mixer |
| Production | Verena Baldeo | Production Supervisor |
| Camera | Gianfranco Massa | Still Photographer |
| Crew | Antonio Corridori | Special Effects |
| Costume & Make-Up | Ferdinando Merolla | Hairdresser |
| Camera | Massimo Intoppa | Assistant Camera |
| Costume & Make-Up | Rosario Prestopino | Key Makeup Artist |
| Costume & Make-Up | Franco Casagni | Makeup Artist |
| Sound | Brian Eno | Music |
