 Michael CaineMaj. John Tarrant | Maj. John Tarrant |
 Donald PleasenceCedric Harper | Cedric Harper |
 Delphine SeyrigCeil Burrows | Ceil Burrows |
 Clive RevillAlf Chestermann | Alf Chestermann |
 John VernonMcKee | McKee |
 Joss AcklandChief Supt. Wray | Chief Supt. Wray |
 Janet SuzmanAlex Tarrant | Alex Tarrant |
 Catherine SchellLady Melissa Julyan | Lady Melissa Julyan |
 Joseph O'ConorSir Edward Julyan | Sir Edward Julyan |
 Denis QuilleyBateson | Bateson |
 Derek NewarkMonitoring Policeman | Monitoring Policeman |
 Edward HardwickeMike McCarthy | Mike McCarthy |
| MMaureen PryorJane Harper | Jane Harper |
 Joyce CareyMiss Monley | Miss Monley |
| PPreston LockwoodIlkeston | Ilkeston |
| MMolly UrquhartMargaret | Margaret |
 David DakerMI5 Man | MI5 Man |
 Hermione BaddeleyHetty | Hetty |
 Patrick BarrGen. St. John | Gen. St. John |
 Yves AfonsoJacques (uncredited) | Jacques (uncredited) |
| DDel BakerShadow (uncredited) | Shadow (uncredited) |
| MMurray BrownDoctor (uncredited) | Doctor (uncredited) |
| LLes ConradM15 Man (uncredited) | M15 Man (uncredited) |
| GGeorge Lane CooperPincus (uncredited) | Pincus (uncredited) |
| BBrenda CowlingSecretary (uncredited) | Secretary (uncredited) |
 Robert DorningJeweller (uncredited) | Jeweller (uncredited) |
| RRoy EversonM15 Man (uncredited) | M15 Man (uncredited) |
| NNancy GabrielleManageress (uncredited) | Manageress (uncredited) |
 Jill GoldstonCommuter (uncredited) | Commuter (uncredited) |
| CCharlie GrayTourist (uncredited) | Tourist (uncredited) |
