Also Known As:
- The Spy in Black
- U-Boat 29
- De zwarte spion
- Den sorte spion
- Der Spion in Schwarz
- El espía negro
- El espía submarino U-29
- L'espion noir
- La spia in nero
- O Espião Negro
- O espião de preto
- O mavros kataskopos
- Szpieg w czerni
- Michael Powell
- J. Storer Clouston
- Emeric Pressburger
- Roland Pertwee
- Conrad Veidt ... Captain Hardt
- Sebastian Shaw ... Lt. Ashington / Cmdr. David Blacklock
- Valerie Hobson ... Frau Tiel / Jill Blacklock
- Marius Goring ... Lt. Felix Schuster
- June Duprez ... Anne Burnett
- Athole Stewart ... The Rev. Hector Matthews
- Agnes Lauchlan ... Mrs. Matthews
- Helen Haye ... Mrs. Sedley
- Cyril Raymond ... The Rev. John Harris
- George Summers ... Captain Walter Ratter
- Hay Petrie ... Engineer
- Grant Sutherland ... Bob Bratt
- Robert Rendel ... Admiral
- Mary Morris ... Chauffeuse
- Margaret Moffatt ... Kate
- Kenneth Warrington ... Commander Denis
- Torin Thatcher ... Submarine Officer
- Esma Cannon ... Maggie
- Bryan Herbert ... Corporal Guarding POW's on Ferry
- Skelton Knaggs ... German Sailor looking for Capt. Hardt
- Jack Lambert ... Passport Official
- Howard Marion-Crawford ... German Officer in Kieler Hof Hotel
- Bernard Miles ... Hans - Hotel Receptionist
- John Penrose ... Newlywed at Kiel Hotel
- Johnnie Schofield ... Armed Guard of POW's on Ferry
- Diana Sinclair-Hall ... Undetermined Minor Role
- Graham Stark ... Bell Boy