- James Mason
- Richard Francis Heritage
- Joyce Howard
- Laura Verity
- Tom Walls
- Christopher Child
- Phyllis Stanley
- Lily Bernard
- Edward Rigby
- Mansel
- Ronald Ward
- Carter
- David Farrar
- Commander Lippinscott
- Karel Stepanek
- Riccardo
- Betty Warren
- Fay
- Walter Crisham
- Charlie
- George Robey
- Pawnbroker
- Ronald Chesney
- Max - Mouth Harmonica Player
- Peggy Dexter
- Bobby
- Finlay Currie
- Merchant Captain
- Brefni O'Rorke
- Detective Inspector Burrows
- Jeanne De Casalis
- Lady with Dog
- Patricia Medina
- Mary - Manicurist
- Eric Mason
- Benson - Illusionist
- Herbert Lomas
- Van Driver
- Charles Victor
- Pub Owner
- Robert Sansom
- Petty Officer Bill Grant
- Alvar Liddell
- Boothby - Radio Announcer
- Terence de Marney
- Code Expert
- Anthony Holles
- Hotel Hairdresser
- Ian Fleming
- Undetermined Secondary Role
- Kynaston Reeves
- Naval Officer in Charge of Court Martial
- Percy Walsh
- Police Sergeant
- Elizabeth Flatau
- Undetermined Secondary Role
- John Boxer
- Merchant Navy Officer
- Hilda Campbell-Russell
- Undetermined Secondary Role
- Anthony Dawson
- 2nd Code Expert
- Alf Goddard
- One of Mansel's Tough Friends
- David Keir
- Henry
- Jack May
- 'Bell & Dragon' Customer
- Jack Melford
- Defence Lawyer at Court Martial
- John Miller
- Police Constable
- Hay Petrie
- Waiter
- Ernie Rice
- One of Mansel's Tough Friends
- Leonard Sharp
- Bus Conductor
- Dennis Wyndham
- George the Barman
