- Unknown:
- Derwent Davies.
- Produced By:
- Val Gielgud
- Colonel Redl:
- Keneth Kent
- Vera Soumarokhova:
- Rita Vale
- Major Sergei Zoubatoff:
- Leslie Perrins
- Masha, a dresser:
- Gladys Spencer
- Captain Ernst Ronge:
- Charles Lefeaux
- Gerda Strauss:
- Rosalyn Boulter
- General U von Ostromiecz:
- Frederick Lloyd
- Lieutenant Karl Hofer:
- Lewis Stringer
- Bauer:
- Cyril Gardiner
- Littmann:
- Sebastian Cabot
- A waiter:
- William Trent
- A porter:
- John Stone
- Reception clerk:
- Preston Lockwood
- Director of the Post Office:
- George Owen
- Post Office clerk:
- Arthur Ridley
- Head porter:
- Victor Fairley
