 | Mark Stevens als Bradford Galt |
 | Lucille Ball als Kathleen Stewart |
 | Clifton Webb als Hardy Cathcart |
 | William Bendix als Stauffer, a.k.a. Fred Foss |
 | Kurt Kreuger als Anthony Jardine |
 | Cathy Downs als Mari Cathcart |
 | Reed Hadley als Lt. Frank Reeves |
 | Constance Collier als Mrs. Kingsley |
 | Eddie Heywood als Self |
| Colleen Alpaugh als Little Girl with Slide Whistle (uncredited) |
 | Charles Cane als Policeman at Tony's Apartment (uncredited) |
 | Ellen Corby als Maid (uncredited) |
 | Ralph Dunn als Policeman at Gallery (uncredited) |
 | John Elliott als Laundry Proprietor (uncredited) |
 | Mary Field als Movie Theatre Cashier (uncredited) |
| John Goldsworthy als Butler (uncredited) |
| Vincent Graeff als Newsboy Witness (uncredited) |
 | Chuck Hamilton als Man at Hit & Run Attempt (uncredited) |
 | Eloise Hardt als Miss Dennis, Saleswoman (uncredited) |
 | John Kelly als Policeman at Gallery (uncredited) |
 | Colin Kenny als Bartender (uncredited) |
 | Molly Lamont als Lucy Wilding (uncredited) |
 | Hope Landin als Woman Scrubbing Floor (uncredited) |
| Thomas Louden als Elderly Man (uncredited) |
 | Donald MacBride als Policeman at Gallery (uncredited) |
 | Frank Marlowe als First Cab Driver (uncredited) |
| Thomas Martin als Henry, the Majordomo (uncredited) |
 | Matt McHugh als Milkman (uncredited) |
 | Forbes Murray als Mr. Bryson (uncredited) |
| Steve Olsen als Arcade Barker (uncredited) |
 | Isabel Randolph als Mrs. Reynolds (uncredited) |
 | John Russell als Policeman at Tony's Apartment (uncredited) |
 | Douglas Spencer als Deli Customer (uncredited) |
| Frieda Stoll als Frau Keller (uncredited) |
 | Charles Tannen als Second Cab Driver (uncredited) |
 | Minerva Urecal als Client Wife (uncredited) |
 | Charles Wagenheim als The Real Fred Foss (uncredited) |
 | Regina Wallace als Mrs. Bryson (uncredited) |
| Gisela Werbisek als Mrs. Schwartz (uncredited) |
| Lynn Whitney als Stenographer (uncredited) |
| Peter Cusanelli als Minor Role (uncredited) |
 | Alice Fleming als Minor Role (uncredited) |
| Eugene Goncz als Practical Sign Painter (uncredited) |
| Sam Harris als Party Guest (uncredited) |
 | Harold Miller als Party Guest (uncredited) |
| Tom Monroe als Policeman (uncredited) |
 | Lee Phelps als Policeman on Street (uncredited) |
| Joe Ploski als Deli Customer (uncredited) |
| Raisa als Client Daughter (uncredited) |
| Pietro Sosso als Old Man (uncredited) |
| Jay Dratler | Screenplay |
| Bernard C. Schoenfeld | Screenplay |
| Henry Hathaway | Director |
| J. Watson Webb Jr. | Editor |
| William Eckhardt | Assistant Director |
| Joseph MacDonald | Director of Photography |
| Cyril J. Mockridge | Original Music Composer |
| James Basevi | Art Direction |
| Kay Nelson | Costume Design |
| Fred Kohlmar | Producer |
| Leland Fuller | Art Direction |
| Thomas Little | Set Decoration |
| Leo Rosten | Story |
| Harry Kleiner | Additional Writing |
| Fred Kohlmar | Additional Writing |
| Ben Nye | Makeup Artist |
| Maurice De Packh | Orchestrator |
| Emil Newman | Music Director |
| Sam Benson | Wardrobe Supervisor |
| Chuck Hamilton | Stunts |
| John Kelly | Stunts |
| W. D. Flick | Sound |
| Harry M. Leonard | Sound |
| Paul Helmick | Second Assistant Director |
| David Silver | Second Assistant Director |
| Charles Hall | Unit Production Manager |
| Raymond A. Klune | Production Manager |
| Paul S. Fox | Assistant Set Decoration |
| Larry Haddock | Props |
| Fred Sersen | Visual Effects |
| Sol Halperin | Visual Effects |
| Edwin Hammeras | Visual Effects |
| Til Gabani | Second Assistant Camera |
| Charles Althouse | Scoring Mixer |
| Paul Neal | Scoring Mixer |
| Murray Spivack | Scoring Mixer |
