- Merle Oberon
- Mrs. Richardson
- Ralph Richardson
- Wing Commander Richardson
- June Duprez
- June
- Flora Robson
- Queen Elizabeth I
- Robert Douglas
- Briefing Officer
- Anthony Bushell
- Pilot
- Brian Worth
- Bobby
- Austin Trevor
- Schulemburg - German Air Chief of Staff
- Ivan Brandt
- Air Officer
- G.H. Mulcaster
- Controller
- Herbert Lomas
- Holveg
- Milton Rosmer
- Head of Observer Corps
- Ronald Adam
- German Bomber Chief
- Robert Rendel
- British Chief of Air Staff
- John Longden
- Unnamed Character
- Archibald Batty
- Air Officer
- Ian Fleming
- Air Officer
- Charles Carson
- Anti-Aircraft Officer
- John Penrose
- Unnamed Character
- Frank Tickle
- Unnamed Character
- John Robinson
- Unnamed Character
- Derrick De Marney
- Bill - Navigator
- Carl Jaffe
- Unnamed Character
- Gerald Case
- Unnamed Character
- Torin Thatcher
- Seaman Receiving Information About German Activity
- Bernard Miles
- Civilian Observer Controller
- E.V.H. Emmett
- Commentator
- Neville Chamberlain
- Self - Prime Minister of England
- Engelbert Dollfuss
- Self - Chancellor of Austria
- Hermann Göring
- Self
- Adolf Hitler
- Self
- Raymond Huntley
- Minor Role
- King George VI
- Self
- Miles Malleson
- Minor Role
- Prince Monolulu
- Self
- Princess Margaret
- Self
- Queen Elizabeth II
- Self
- Queen Elizabeth the Queen Mother
- Self
- Kurt Schuschnigg
- Self - Chancellor of Austria
- Ronald Shiner
- Minor Role
