- Marlene Dietrich
- Marie Kolverer / X27
- Victor McLaglen
- Colonel Kranau
- Gustav von Seyffertitz
- Austrian Secret Service Chief
- Warner Oland
- Colonel von Hindau
- Lew Cody
- Colonel Kovrin
- Barry Norton
- Young Lieutenant - Firing Squad
- Max Barwyn
- Colonel Kranau's Aide
- Blackie
- Cat
- B.F. Blinn
- Gambler with Glasses
- Allan Cavan
- Secret Service Agent in Casino
- Davison Clark
- Court-Martial Officer
- Alexis Davidoff
- Officer
- William B. Davidson
- 2nd Firing Squad Officer
- Walter Downing
- Old Officer
- Geraldine Dvorak
- Casino Patron
- Adolph Faylauer
- Gambler
- Joseph W. Girard
- Russian Officer
- Al Hart
- Monk
- Ramsay Hill
- Grinning Officer
- George Irving
- Contact at Cafe
- Ethan Laidlaw
- Russian Corporal
- Tom London
- Minor Role
- Wilfred Lucas
- Gen. Dymov
- Ruth Mayhew
- Accident Victim
- Harold Nelson
- Fritz - von Hindau's Valet
- Paul Panzer
- Austrian Soldier at Interrogation
- Bill Powell
- Hotel Manager
- Buddy Roosevelt
- Russian Captain of the Guard
- Scott Seaton
- Minor Role
- Harry Semels
- Waiter
