- Constance Bennett
- Carla Vanirska, aka K-14 and Karen Schöntag
- Gilbert Roland
- Capt. Rudolf 'Rudy' Ritter
- Edward Ellis
- Maj. Lieber
- Sam Godfrey
- Franz
- Lucien Prival
- Lt. Erlich
- Mischa Auer
- Agent Lehan
- Ben Hendricks Jr.
- Sgt. Probert
- Leonid Snegoff
- Pvt. Muller
- Evelyn Carter Carrington
- Frau Stengel
- Hooper Atchley
- Captured Contact
- Herman Bing
- Railroad Ticket Clerk
- Adrienne D'Ambricourt
- Frenchwoman
- George Davis
- Frenchman
- Hans Fuerberg
- Austrian Officer
- Sam Harris
- Austrian Officer
- Julie Haydon
- Hysterical Nurse
- Selmer Jackson
- Intelligence Officer
- Edward Keane
- Spy R9
- Vera Lewis
- Anna Huber--a Cleaner
- Frank O'Connor
- Officer on Train
- Frank Reicher
- Major--Medical Officer
- Syd Saylor
- Baggage Man
- Landers Stevens
- Major
- Jack Trent
- Intelligence Officer
- Dorothy Vernon
- Train Passenger
- Wilhelm von Brincken
- Captain--Officer of the Day
- William Wagner
- Overcoat Spy
- Virginia Weidler
- Olga--Carla's Niece
- Paul Weigel
- Concessionaire
- Leo White
- Intelligence Officer
- John Wray
- Mitika--the Gypsy Contact
