- Leslie Howard
- R.J. Mitchell
- David Niven
- Geoffrey Crisp
- Rosamund John
- Diana Mitchell
- Roland Culver
- Cmdr. Bride
- Anne Firth
- Miss Harper
- David Horne
- Mr. Higgins
- J.H. Roberts
- Sir Robert McLean
- Derrick De Marney
- Squadron Leader Jefferson
- Rosalyn Boulter
- Mabel Lovesay
- Herbert Cameron
- MacPherson
- Toni Edgar-Bruce
- Lady Houston
- Gordon McLeod
- Maj. Buchan
- George Skillan
- Mr. Royce
- Erik Freund
- Messerschmitt
- Fritz Wendhausen
- Von Straben
- John Chandos
- Krantz
- Victor Beaumont
- Von Crantz
- Suzanne Clair
- Madeleine
- Filippo Del Giudice
- Bertorelli
- Brefni O'Rorke
- The Specialist
- Gerry Wilmot
- Radio Announcer
- Jack Peach
- Radio Announcer
- Joseph Goebbels
- Self
- Hermann Göring
- Self
- Adolf Hitler
- Self
- John Adams
- Officer at Schneider Cup Race
- Robert Beatty
- American Airman
- Albert Chevalier
- Civilian in Control Room
- Winston Churchill
- Self
- Bunny Currant
- Self
- Peter Gawthorne
- Board Member
- Everley Gregg
- Mitchell's Housekeeper
- Pat Hagan
- Assistant at Schneider Cup Race / Waiter at Party (uncredited)
- Peter Hammond
- Marching German Youth
- Gerard Heinz
- German Officer
- Leslie Ruth Howard
- Nurse
- Peter Howard-Williams
- Fighter Pilot
- Brian Kingcome
- Fighter Pilot
- Brian Kingcome
- Fighter pilot
- Miles Malleson
- Vickers Representative
- Jack May
- Spectator at Schneider Cup Race
- Gibb McLaughlin
- Sir Ian MacLaren
- Patricia Medina
- Venetian Girl
- Bernard Miles
- Lady Houston's Agent
- Olaf Olsen
- Civilian at Richtofen Club
- Cyril Raymond
- Radio Control Officer
