- Will Hay
- Royal Navy: Skipper
- Bernard Miles
- Royal Navy: Mate
- John Stuart
- Royal Navy: Naval Officer
- David Evans
- Royal Air Force: David, an RAF Officer
- Peter De Greef
- Royal Air Force: R.A.F. Member
- John Mills
- Royal Air Force: Tom
- Michael Rennie
- Royal Air Force: George
- Leslie Banks
- Civil Service: Taylor
- Morland Graham
- Civil Service
- John Boxer
- Press
- Cyril Chamberlain
- Press
- Owen Reynolds
- Press
- Quentin Reynolds
- Press: American Journalist
- Michael Redgrave
- Russian
- Leif Konow
- Dane
- Joss Ambler
- German: Stoltenhoff
- Frank Cellier
- German: Schneider
- Alfred Drayton
- German: Direktor
- Marius Goring
- German: Propaganda Officer
- Albert Lieven
- German: Gunter
- Elliott Mason
- German: German Stationmistress
- George Merritt
- German: German Shelter Marshal
- Robert Morley
- German: Von Geiselbrecht
- Austin Trevor
- German: U-boat Captain
- Percy Walsh
- German
- Charles Minor
- Quisling
- Bernard Rebel
- Quisling
- George Woodbridge
- Quisling
- Ronald Adam
- German businessman
- Victor Beaumont
- Nazi in Buna Factory
- Paul Bonifas
- Bit Part
- Mark Daly
- Driver
- Charles Goldner
- Italian Officer
- Kathleen Harrison
- Bit Role
- Thora Hird
- German barmaid
- Lawrence Kingston
- Quisling
- Frederick Piper
- Malta official
- Ronald Shiner
- Shipping clerk
- Basil Sydney
- Bit Part
- Manning Whiley
- Naval officer
- Michael Wilding
- Captain
- John Williams
- Voice over
