Granite-jawed Jack Holt performs a dual role in Columbia's Trapped by G-Men.
| Actor | Role |
|---|---|
 Jack HoltG-Man Martin Galloway, posing as Bill Donovan | G-Man Martin Galloway, posing as Bill Donovan |
 Wynne GibsonAlice Segar, posing as Mrs. Donovan | Alice Segar, posing as Mrs. Donovan |
 C. Henry GordonKilgour | Kilgour |
 Jack La RueFred Drake | Fred Drake |
 Edward BrophyLefty | Lefty |
 William PawleyHarry Grady | Harry Grady |
 Arthur HohlHenchman Blackie | Henchman Blackie |
 Robert Emmett O'ConnorFederal Agent Jim | Federal Agent Jim |
 William BakewellDick Withers | Dick Withers |
 Eleanor StewartNancy Higbee | Nancy Higbee |
 Charles LaneFingers | Fingers |
 Frank DarienDad Higbee | Dad Higbee |
 Lucien PrivalFranzy | Franzy |
 Richard TuckerAgency Chief Conover | Agency Chief Conover |
 George ClevelandMiner | Miner |
 Wallis ClarkFederal Agent | Federal Agent |
 Hal TaliaferroFederal Agent | Federal Agent |