 Bud AbbottChick Larkin | Chick Larkin |
 Lou CostelloMervin Q. Milgrim | Mervin Q. Milgrim |
 Patric KnowlesJim Turner | Jim Turner |
 Louise AllbrittonJane Little | Jane Little |
 Mary WickesJuliet Collins | Juliet Collins |
 William GarganDetective Inspector Lou | Detective Inspector Lou |
 William BendixDetective Sgt. Brannigan | Detective Sgt. Brannigan |
 Thomas GomezCol. J.R. Andrews | Col. J.R. Andrews |
 Ludwig StösselDr. Anton Marek | Dr. Anton Marek |
 Edmund MacDonald'Murder at Midnight' Announcer | 'Murder at Midnight' Announcer |
 Jerome CowanHeller | Heller |
 Walter Tetley'Shorty', a studio pageboy | 'Shorty', a studio pageboy |
 Joe KirkHarry, 'Murder At Midnight' sound man | Harry, 'Murder At Midnight' sound man |
 Don Porter'Murder at Midnight' program manager | 'Murder at Midnight' program manager |
 Norman Abbott'Murder at Midnight' Organist | 'Murder at Midnight' Organist |
| AAbel PinaAcrobat (uncredited) | Acrobat (uncredited) |
| AAntonio PinaAcrobat (uncredited) | Acrobat (uncredited) |
| HHenry PinaAcrobat (uncredited) | Acrobat (uncredited) |
| JJerry PinaAcrobat (uncredited) | Acrobat (uncredited) |
| JJenaro PinaAcrobat (uncredited) | Acrobat (uncredited) |
 Milton ParsonsCoroner (cameo) | Coroner (cameo) |
 Gladys BlakeTelephone Operator | Telephone Operator |
 Eddie BruceBill, man telephoning Brazil | Bill, man telephoning Brazil |
 Billy WayneJake, man telephoning Alaska | Jake, man telephoning Alaska |
 Alice FlemingMrs. Laffingwell, dowager telephoning Moscow | Mrs. Laffingwell, dowager telephoning Moscow |
 Margaret BraytonRadio Actress (uncredited) | Radio Actress (uncredited) |
 Crane WhitleyRadio Actor (uncredited) | Radio Actor (uncredited) |
 Paul DubovRadio Actor (uncredited) | Radio Actor (uncredited) |
 Gene O'DonnellRadio Actor (uncredited) | Radio Actor (uncredited) |
| EEd EmersonAnnouncer (uncredited) | Announcer (uncredited) |
