 Norman WisdomNorman Pitkin / Giulio Napolitani | Norman Pitkin / Giulio Napolitani |
 Jennifer JayneRosanna Guardia | Rosanna Guardia |
 Raymond HuntleySir Ronald Ackroyd | Sir Ronald Ackroyd |
 David LodgeInspector Cecil Hobson | Inspector Cecil Hobson |
 Esma CannonMrs. Timms | Mrs. Timms |
 Eric BarkerPolice Doctor | Police Doctor |
 Eleanor SummerfieldSergeant Lucilla Wilkins | Sergeant Lucilla Wilkins |
 Ronnie StevensOberon | Oberon |
 Terence AlexanderChief Superintendent Bert Belcher | Chief Superintendent Bert Belcher |
 Maurice KaufmannVince | Vince |
| DDilys LayeAmerican Lady | American Lady |
 George PastellManzini | Manzini |
 Jack WatsonPolice Sergeant | Police Sergeant |
 Campbell SingerBollington | Bollington |
 Lionel MurtonMan on Underground Train | Man on Underground Train |
 Robert RiettiItalian Lawyer | Italian Lawyer |
| MMarjie LawrenceCrying Lady | Crying Lady |
| PPeggy Ann CliffordMrs. Napolitani | Mrs. Napolitani |
 Jean AubreyLady Hinchingford | Lady Hinchingford |
 Monte LandisMr. Bassett | Mr. Bassett |
 Mario FabriziNewspaper Seller | Newspaper Seller |
 Alfred BurkeTrigger O'Flynn | Trigger O'Flynn |
| FFredric Abbott(uncredited) | (uncredited) |
| JJohn AdamsDetective (uncredited) | Detective (uncredited) |
| FFrank AndrewsDetective (uncredited) | Detective (uncredited) |
| BBarbara BennettWoman in Street (uncredited) | Woman in Street (uncredited) |
 John BlytheChauffeur (uncredited) | Chauffeur (uncredited) |
| TTony CastletonPolice Constable (uncredited) | Police Constable (uncredited) |
 Cyril ChamberlainCafé Proprietor (uncredited) | Café Proprietor (uncredited) |
| PPauline ChamberlainHairdresser (uncredited) | Hairdresser (uncredited) |
