 | Gene Kelly als Giovanni E. 'Johnny' Columbo |
 | Teresa Celli als Isabella Gomboli |
 | J. Carrol Naish als Louis Lorelli |
 | Mario Siletti als Benny Danetta / Nino |
 | Marc Lawrence als Caesar Xavier Serpi |
 | Frank Puglia als Carlo Sabballera |
 | Barry Kelley als Capt. Thompson |
 | Carl Milletaire als George Allani / Tomasino |
 | Eleonora von Mendelssohn als Maria Columbo |
| Luther Davis | Writer |
| Paul Vogel | Director of Photography |
| Leo Townsend | Story |
| Richard Thorpe | Director |
| William H. Wright | Producer |
| Cotton Warburton | Editor |
| Alberto Colombo | Original Music Composer |
| Cedric Gibbons | Art Direction |
| Gabriel Scognamillo | Art Direction |
| Douglas Shearer | Recording Supervision |
| Edwin B. Willis | Set Decoration |
| Charles DeCrof | Assistant Set Decoration |
| Warren Newcombe | Special Effects |
| Walter Plunkett | Costume Design |
| Sydney Guilaroff | Hairstylist |
| Jack Dawn | Makeup Artist |
