 | Chester Morris als Horatio 'Boston Blackie' Black |
 | Erik Rolf als Dooley Watson |
 | Jeanne Bates als Mary Watson |
 | Richard Lane als Insp. John Farraday |
 | George E. Stone als The Runt |
 | Lloyd Corrigan als Arthur Manleder |
 | Douglas Fowley als Nails Blanton (Uncredited) |
 | Sid Melton als Benny Hines (Uncredited) |
 | Ray Teal als Policeman Joe (Uncredited) |
 | Maude Eburne als Edna Counihan (Uncredited) |
 | Arthur Hunnicutt als Elwood "Tex" Stewart (Uncredited) |
 | Cy Kendall als Jumbo Madigan (Uncredited) |
 | Larry Olsen als Johnny Watson (Uncredited) |
 | Pierre Watkin als State Governor Rutledge (Uncredited) |
 | Walter Sande als Detective Sergeant Matthews (Uncredited) |
| Jack Carr als Carpet Man (Uncredited) |
 | Richard Alexander als Carpet Man (Uncredited) |
| George Anderson als Warden J.A. Edwards (Uncredited) |
 | Jessie Arnold als Woman in Hallway (Uncredited) |
 | Trevor Bardette als Manny Vogel (Uncredited) |
 | Eddie Bruce als Sandy (Uncredited) |
| Sally Cairns als Richie Adair (Uncredited) |
 | Eddy Chandler als Policeman Frank (Uncredited) |
| James Conaty als Parole Board Member (Uncredited) |
 | Heinie Conklin als Police Desk Sergeant (Uncredited) |
| Marie De Becker als Miss Bailey (Uncredited) |
 | Sayre Dearing als Reporter at Parole Board Hearing (Uncredited) |
 | Minta Durfee als Woman in Hallway (Uncredited) |
| Ben Erway als Prison Warden Root (Uncredited) |
| Jerry Frank als George Phillips (Uncredited) |
 | Joel Friedkin als Joe Painter (Uncredited) |
 | Kit Guard als Wilfred Thompson (Uncredited) |
 | John Harmon als Red Taggart (Uncredited) |
 | Carl M. Leviness als Parole Board Member (Uncredited) |
 | George Magrill als Policeman (Uncredited) |
| Al Murphy als William Jones (Uncredited) |
 | Forbes Murray als Chairman of Parole Board (Uncredited) |
 | Frank O'Connor als Policeman (Uncredited) |
| Brian O'Hara als Parker Gray (Uncredited) |
| Dick Rush als Policeman Lally (Uncredited) |
 | Harry Semels als Jerome Wagner (Uncredited) |
 | John Tyrrell als Driver (Uncredited) |
| Bobby Hale als British Newsman |
| William Castle | Director |
| Jack Boyle | Characters |
| Paul Yawitz | Writer |
| Clay Campbell | Makeup Artist |
| Wallace MacDonald | Producer |
| Robert Priestley | Set Decoration |
| Earl Bellamy | Assistant Director |
| Jerome Thoms | Editor |
| Paul Murphy | Art Direction |
| Lionel Banks | Art Direction |
| Ernest Miller | Director of Photography |
| Friedrich Hollaender | Additional Music |
| Ben Oakland | Additional Music |
| Werner R. Heymann | Additional Music |
| Eddie Parker | Stunts |
| Chuck Hamilton | Stunts |
| Gregory Stone | Additional Music |
| Sidney Cutner | Additional Music |
| Matty Roubert | Stunts |
| Morris Stoloff | Music Director |
| George Magrill | Stunts |
| Earl Snyder | Sound Engineer |
| George Parrish | Additional Music |
