 David HemmingsMarcus Daly | Marcus Daly |
 Daria NicolodiGianna Brezzi | Gianna Brezzi |
 Gabriele LaviaCarlo | Carlo |
 Macha MérilHelga Ulmann | Helga Ulmann |
 Eros PagniSupt. Calcabrini | Supt. Calcabrini |
 Giuliana CalandraAmanda Righetti | Amanda Righetti |
| PPiero MazzinghiBardi | Bardi |
 Glauco MauriProf. Giordani | Prof. Giordani |
 Clara CalamaiMarta | Marta |
| AAldo BonamanoCarlo's Father | Carlo's Father |
 Liana Del BalzoElvira | Elvira |
 Vittorio FanfoniCop Taking Notes | Cop Taking Notes |
 Dante FiorettiPolice Photographer | Police Photographer |
 Geraldine HooperMassimo Ricci | Massimo Ricci |
 Jacopo MarianiYoung Carlo | Young Carlo |
 Furio MeniconiRodi | Rodi |
 Fulvio MingozziAgent Mingozzi | Agent Mingozzi |
 Lorenzo PianiFingerprint Cop | Fingerprint Cop |
 Salvatore PuntilloPolice Agent | Police Agent |
 Piero VidaFat Cop | Fat Cop |
 Nicoletta ElmiOlga | Olga |
 Dario ArgentoMurderer's Hands (uncredited) | Murderer's Hands (uncredited) |
 Salvatore BaccaroFruit Vendor (uncredited) | Fruit Vendor (uncredited) |
 Omero CapannaHitman (uncredited) | Hitman (uncredited) |
 Bruno Di LuiaConcerned Man in Restroom (uncredited) | Concerned Man in Restroom (uncredited) |
 Attilio DottesioFlorist (uncredited) | Florist (uncredited) |
 Tom FelleghySurgeon (uncredited) | Surgeon (uncredited) |
 Glauco Onorato(uncredited) | (uncredited) |
 Marilù ToloCarol (archive footage) (uncredited) | Carol (archive footage) (uncredited) |
| FFranco VaccaroPietro Valgoi (uncredited) | Pietro Valgoi (uncredited) |
