 Cecil ParkerArthur Prohack | Arthur Prohack |
 Dirk BogardeCharles Prohack | Charles Prohack |
 Hermione BaddeleyEve Prohack | Eve Prohack |
 Sheila SimMary Prohack | Mary Prohack |
 Glynis JohnsMimi Warburton | Mimi Warburton |
 Denholm ElliottOswald Morfrey | Oswald Morfrey |
 Jon PertweePlover | Plover |
 Heather ThatcherLady Maslam | Lady Maslam |
| CCampbell CottsSir Paul Spinner | Sir Paul Spinner |
 Bryan ForbesTony | Tony |
 Frederick ValkDr. Viega | Dr. Viega |
| CCharles GoldnerPolish Man Servant | Polish Man Servant |
 Russell WatersCartwright | Cartwright |
 Henry EdwardsSir Digby Bunce | Sir Digby Bunce |
 James HayterCarrell Quire | Carrell Quire |
 Ada ReeveMrs. Griggs | Mrs. Griggs |
| FFrances WaringNursie | Nursie |
 Judith FurseLaura Postern | Laura Postern |
 Frederick LeisterThe Director General | The Director General |
| EElwyn Brook-JonesBenny Erivangian | Benny Erivangian |
| EEric BerryTailor's Assistant (uncredited) | Tailor's Assistant (uncredited) |
| JJanet BurnellMr. Prohack's Personal Assistant (uncredited) | Mr. Prohack's Personal Assistant (uncredited) |
 Ian CarmichaelHat Salesman (uncredited) | Hat Salesman (uncredited) |
| AAnne GunningActress (uncredited) | Actress (uncredited) |
| HHumphrey HeathcoteTurkish Bath Attendant (uncredited) | Turkish Bath Attendant (uncredited) |
| DDesmond NewlingPageboy (uncredited) | Pageboy (uncredited) |
| LLloyd PearsonMr. Bishop (uncredited) | Mr. Bishop (uncredited) |
| SStanelliOrchestra Leader (uncredited) | Orchestra Leader (uncredited) |
 Jerry VernoTaxi Driver (uncredited) | Taxi Driver (uncredited) |
| SSam LysonsClub Porter | Club Porter |
