 | Michael Brandon als Roberto Tobias |
 | Mimsy Farmer als Nina Tobias |
 | Jean-Pierre Marielle als Gianni Arrosio |
 | Aldo Bufi Landi als Pathologist |
 | Calisto Calisti als Carlo Marosi |
 | Marisa Fabbri als Amelia, the Maid |
 | Oreste Lionello als The Professor |
 | Fabrizio Moroni als Mirko |
 | Corrado Olmi als Porter |
 | Stefano Satta Flores als Andrea |
 | Laura Troschel als Maria |
 | Francine Racette als Dalia |
 | Bud Spencer als Diomede / Godfrey |
 | Dante Cleri als Coffin Salesman |
 | Guerrino Crivello als Rambaldi, the Neighbor |
 | Gildo Di Marco als Postman |
 | Tom Felleghy als Police Commissioner Pini |
| Leopoldo Migliori als Musician |
 | Fulvio Mingozzi als Music Studio Manager |
 | Stefano Oppedisano als Bearded guy with girlfriend |
 | Pino Patti als Funeral Exhibition Attendant |
 | Ada Pometti als Extra (credit only) |
| Jacques Stany als Psychiatrist |
| Fortunato Cecilia als Funeral Exhibition Visitor (uncredited) |
| Franz Colangeli als Funeral Exhibition Visitor (uncredited) |
 | Shirley Corrigan als Girl at Party (uncredited) |
 | Luigi Cozzi als Masked Killer in Theater (uncredited) |
 | Giovanni Di Benedetto als Funeral Exhibition Attendant (uncredited) |
 | Sandro Dori als Funeral Exhibition Attendant (uncredited) |
| Renzo Marignano als Funeral Exhibition Attendant (uncredited) |
 | Quinto Marziali als Funeral Exhibition Visitor (uncredited) |
| Diego Morreale als Extra (uncredited) |
| Anna Maria Perego als Delia's Mother (uncredited) |
 | Pupita Lea Scuderoni als Funeral Exhibition Visitor (uncredited) |
| Maurizio Streccioni als Funeral Exhibition Visitor (uncredited) |
| Luigi Cozzi | Story |
| Dario Argento | Director |
| Mario Foglietti | Story |
| Dario Argento | Screenplay |
| Dario Argento | Story |
| Salvatore Argento | Producer |
| Franco Di Giacomo | Director of Photography |
| Ennio Morricone | Original Music Composer |
| Paolo Borselli | Hairstylist |
| Giuliano Laurenti | Makeup Artist |
| Enrico Sabbatini | Production Design |
| Françoise Bonnot | Editor |
| Carlo Rambaldi | Special Effects |
| Umberto Dessena | Grip |
| Giovanni Viti | Wardrobe Assistant |
| Bruno Nicolai | Conductor |
| Massimo Anzellotti | Sound Effects Editor |
| Carlo Du Bois | Administration |
| Giuseppe Ciccocioppo | Props |
| Franco Pedacchia | Set Dresser |
| Roberto Forges Davanzati | Assistant Camera |
| Gianfranco Transunto | Assistant Camera |
| Ennio Mancini | Electrician |
| Mario Grilli | Decorator |
| Giovanni Viti | Assistant Art Director |
| Bruno Bianchini | Assistant Editor |
| Patrizia Zulini | Script Supervisor |
| Angelo Iacono | Production Manager |
| Fernando Monti | Grip |
| Roberto Carnevali | Still Photographer |
| Orazio Sinacore | Electrician |
| Gastone Coppa | Key Grip |
| Giovanni Morosi | Assistant Makeup Artist |
| Massimo Lentini | Assistant Costume Designer |
| Sergio Fraticelli | Assistant Editor |
| Mauro Marchetti | Assistant Camera |
| Anteo Pacini | Electrician |
| Dino Galiano | Special Effects |
| Carlo Cucchi | Production Secretary |
| Roberta Leoni | Production Secretary |
| Mario Ronchetti | Sound Engineer |
| Giuseppe Lanci | Camera Operator |
| Mina Manes | Tailor |
| Roberto Pariante | Assistant Director |
| Franco Bassi | Sound Mixer |
| Valerio Garzia | Gaffer |
| Edda Dell'Orso | Musician |
| Eugenio Fiori | Boom Operator |
| Mario Boccanegra | Grip |
| Franco Gubiotti | Electrician |
| Luciano Anzellotti | Sound Effects |
| Giuseppe Mangogna | Unit Manager |
