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