 Edward G. RobinsonEdward 'Ed' Renard | Edward 'Ed' Renard |
 Francis LedererKurt Schneider | Kurt Schneider |
 George SandersFranz Schlager | Franz Schlager |
 Paul LukasDr. Kassell | Dr. Kassell |
 Henry O'NeillAttorney Kellogg | Attorney Kellogg |
 Dorothy TreeHilda Kleinhauer | Hilda Kleinhauer |
 Lya LysErika Wolf | Erika Wolf |
 Grace StaffordMrs. Schneider | Mrs. Schneider |
 James StephensonBritish Military Intelligence Agent | British Military Intelligence Agent |
 Hedwiga ReicherMrs. Kassell | Mrs. Kassell |
 Joe SawyerWerner Renz | Werner Renz |
 Sig RumanKrogman | Krogman |
 Lionel RoyceHintze | Hintze |
 Henry VictorWildebrandt | Wildebrandt |
 Hans Heinrich von TwardowskiHelldorf | Helldorf |
 Wolfgang ZilzerWestphal | Westphal |
 Frederick VogedingCaptain Richter | Captain Richter |
| WWilly KaufmanGreutzwald | Greutzwald |
 Rudolph AndersCaptain Straubel | Captain Straubel |
 Wilhelm von BrinckenCaptain von Eichen | Captain von Eichen |
| GGeorge RosenerKlauber | Klauber |
| FFrederick BurtonU.S. District Court Judge | U.S. District Court Judge |
 Eily MalyonMrs. McLaughlin | Mrs. McLaughlin |
 Bodil RosingPassenger on Boat | Passenger on Boat |
| JJohn DeeringNarration by | Narration by |
 Louis AdlonNazi American Youth Leader (uncredited) | Nazi American Youth Leader (uncredited) |
 Fred AldrichNazi at Bund Meeting (uncredited) | Nazi at Bund Meeting (uncredited) |
 Sherwood BaileyNewsboy at End (uncredited) | Newsboy at End (uncredited) |
 Ward BondAmerican Legionnaire (uncredited) | American Legionnaire (uncredited) |
| WWalter BonnNaval Officer Seeing Renard at Seaplane (uncredited) | Naval Officer Seeing Renard at Seaplane (uncredited) |
