| Jack Lemmon | Felix Ungar |
| Walter Matthau | Oscar Madison |
| John Fiedler | Vinnie |
| Herb Edelman | Murray |
| David Sheiner | Roy |
| Larry Haines | Speed |
| Monica Evans | Cecily Pigeon |
| Carole Shelley | Gwendolyn Pigeon |
| Iris Adrian | Waitress |
| Matty Alou | Himself |
| Director | Gene Saks |
| Producer | Howard W. Koch |
| Writer | Neil Simon |
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