 Leigh McCloskeyMark Elliot | Mark Elliot |
 Irene MiracleRose Elliot | Rose Elliot |
 Eleonora GiorgiSara | Sara |
 Daria NicolodiElise Stallone Van Adler | Elise Stallone Van Adler |
 Sacha PitoëffKazanian | Kazanian |
 Alida ValliCarol | Carol |
 Veronica LazărNurse | Nurse |
 Gabriele LaviaCarlo | Carlo |
 Feodor Chaliapin Jr.Professor Arnold / Dr. Varelli | Professor Arnold / Dr. Varelli |
 Leopoldo MastelloniJohn, the Butler | John, the Butler |
 Ania PieroniMater Lachrymarum | Mater Lachrymarum |
| JJames FleetwoodCook | Cook |
| RRosario RigutiniMan | Man |
| RRyan HilliardShadow | Shadow |
 Paolo PaoloniMusic Teacher | Music Teacher |
 Fulvio MingozziCabdriver | Cabdriver |
| LLuigi LodoliBookbinder | Bookbinder |
| RRodolfo LodiOld Man | Old Man |
 Dario ArgentoNarrator (voice) (uncredited) | Narrator (voice) (uncredited) |
 Ettore MartiniBurning Building Cop (uncredited) | Burning Building Cop (uncredited) |
 Corinne DunneTenant in New York Building (uncredited) | Tenant in New York Building (uncredited) |
 Filippo PeregoTenant in New York Building (uncredited) | Tenant in New York Building (uncredited) |
 Anna ValentinoSmiling Girl in Library (uncredited) | Smiling Girl in Library (uncredited) |
| CChristina LindbergensenA hanging woman (uncredited) | A hanging woman (uncredited) |
| AAndrea PiazzesiPedestrian (uncredited) | Pedestrian (uncredited) |
 Teresa Rossi PassantePedestrian (uncredited) | Pedestrian (uncredited) |
