 John Phillip LawDiabolik | Diabolik |
 Marisa MellEva Kant | Eva Kant |
 Michel PiccoliInspector Ginko | Inspector Ginko |
 Adolfo CeliRalph Valmont | Ralph Valmont |
 Claudio GoraPolice Chief | Police Chief |
 Mario DonenSgt. Danek | Sgt. Danek |
 Renzo PalmerMr. Hammond | Mr. Hammond |
 Caterina BorattoLady Clark | Lady Clark |
 Lucia ModugnoProstitute | Prostitute |
 Annie GorassiniRose | Rose |
 Carlo CroccoloLorry Driver | Lorry Driver |
 Lidia BiondiPolicewoman | Policewoman |
 Andrea BosicBank Manager | Bank Manager |
| FFederico BoidoJoe | Joe |
 Tiberio MitriValmont's Henchman #1 | Valmont's Henchman #1 |
 Isarco RavaioliValmont's Henchman #2 | Valmont's Henchman #2 |
 Giorgio ScioletteDr. Ferrar | Dr. Ferrar |
 Terry-ThomasMinister of Interior / Minister of Finance | Minister of Interior / Minister of Finance |
 Giulio DonniniDr. Vernier (uncredited) | Dr. Vernier (uncredited) |
 Edward Febo KellengSir Harold Clark (uncredited) | Sir Harold Clark (uncredited) |
 Sandro DoriStud (uncredited) | Stud (uncredited) |
 Giorgio GennariRudy (uncredited) | Rudy (uncredited) |
| GGiuseppe FazioTony (uncredited) | Tony (uncredited) |
 Massimo CiprariFake Diplomat (uncredited) | Fake Diplomat (uncredited) |
| FFranco BellucciFake Diplomat (uncredited) | Fake Diplomat (uncredited) |
| OOrlando PallamariMr. Hammond's Secretary (uncredited) | Mr. Hammond's Secretary (uncredited) |
 Francesco MulèCrematoria Operator (uncredited) | Crematoria Operator (uncredited) |
 Wolfgang HillingerValmont's Henchman (uncredited) | Valmont's Henchman (uncredited) |
 Angela PalmieriDr. Vernier's Nurse (uncredited) | Dr. Vernier's Nurse (uncredited) |
 Regina Elena BisioOld Woman at the Morgue (uncredited) | Old Woman at the Morgue (uncredited) |
