- Eric Portman
- Arthur Lawrence
- Ann Dvorak
- Joan Grahame
- Karel Stepanek
- Franz von Brinkman
- Ronald Ward
- Rupert Chessman
- Ronald Adam
- George Merrick
- Felix Aylmer
- Sir Alfred Horton
- Brefni O'Rorke
- Security Officer
- A.E. Matthews
- Sir Thomas Leighton
- Ivor Barnard
- Henry Waud
- David Peel
- Lt. Peter Leighton
- Charles Victor
- Petty Officer Flanagan
- George Merritt
- Works Manager
- Marjorie Rhodes
- Mrs. Pickles
- John Ruddock
- Jim
- Frederick Cooper
- Gösta
- Lily Kann
- Karin Möller
- Richard George
- Admiral of Operations
- James Pirrie
- Reporter
- Doyley John
- Lt. Commander
- Norman Whitcomb
- Brinkmann's Secretary
- Ian Fleming
- (uncredited)
- Hay Petrie
- (uncredited)
- Anthony Shaw
- Lisbon Attaché
- George Woodbridge
- (uncredited)
