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| Marilyn Monroe | Amanda Dell |
| Yves Montand | Jean-Marc Clement |
| Tony Randall | Alexander Coffman |
| Frankie Vaughan | Tony Danton |
| Wilfrid Hyde White | John Wales |
| David Burns | Oliver Burton |
| Michael David | Dave Kerry |
| Mara Lynn | Lily Nyles |
| Dennis King Jr. | Abe Miller |
| Joe Besser | Charlie Lamont |
| Madge Kennedy | Miss Manners, Clement's secretary (uncredited) |
| Ray Foster | Jimmy (uncredited) |
| Mike Mason | Yale (uncredited) |
| John Craven | Comstock (uncredited) |
| Harry Cheshire | Minister, Amanda's father (uncredited) |
| Larry Thor | Wilson (uncredited) |
| Richard Fowler | Van Cliburn impersonator (uncredited) |
| Marian Manners | Maria Callas impersonator (uncredited) |
| Oscar Beregi Jr. | Chauffeur (uncredited) |
| Geraldine Wall | Wales' secretary-receptionist (uncredited) |
| Milton Berle | Himself (uncredited) |
| Bing Crosby | Himself (uncredited) |
| Gene Kelly | Himself/Gene Kelly (uncredited) |
A billionaire plays himself in an off-Broadway satire and falls for his co-star .
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