| Gene Kelly | Don Lockwood |
| Debbie Reynolds | Kathy Selden |
| Donald O'Connor | Cosmo Brown |
| Jean Hagen | Lina Lamont |
| Millard Mitchell | R.F. Simpson |
| Rita Moreno | Zelda Zanders |
| Douglas Fowley | Roscoe Dexter |
| Cyd Charisse | Dancer |
| Madge Blake | Dora Bailey (uncredited) |
| King Donovan | Rod (uncredited) |
| Kathleen Freeman | Phoebe Dinsmore (uncredited) |
| Bobby Watson | Diction Coach (uncredited) |
| Jimmy Thompson | Male Lead in "Beautiful Girl" Number (uncredited) |
| Dan Foster | Assistant Director (uncredited) |
| Margaret Bert | Wardrobe Woman (uncredited) |
| Mae Clarke | Hairdresser (uncredited) |
| John Dodsworth | Baron de la Ma de la Toulon (uncredited) |
| Stuart Holmes | J. Cumberland Spendrill III (uncredited) |
A silent-film star loves a chorus girl who dubs his squeaky-voiced co-star in a 1927 Hollywood talkie.
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