 | Jack Lemmon als Harry Berlin |
 | Peter Falk als Milt Manville |
 | Elaine May als Ellen Manville |
 | Nina Wayne als Linda |
 | Eddie Mayehoff als D.A. Goodhart |
 | Paul Hartman als Doyle |
 | Severn Darden als Vandergist |
 | Alan DeWitt als Dalrymple |
| Martin Abrahams als Coney Island Attendant (uncredited) |
| Don Ames als Restaurant Patron (uncredited) |
| James J. Casino als Bar Patron (uncredited) |
 | Noble 'Kid' Chissell als Bar Patron (uncredited) |
| Terrayne Crawford als Woman in the Car (uncredited) |
| Daniel Elam als Bar Patron (uncredited) |
| Duke Fishman als Bar Patron (uncredited) |
 | Harrison Ford als Irate Motorist (uncredited) |
| Ralph Gambina als Bar Patron (uncredited) |
| Joseph Glick als Bar Patron (uncredited) |
| Richard LaMarr als Bar Patron (uncredited) |
| Clarence M. Landry als Bar Patron (uncredited) |
| Esther Ying Lee als Restaurant Patron (uncredited) |
| Tina Menard als Elevator Passenger (uncredited) |
 | Bob Okazaki als Maitre D' (uncredited) |
 | Cap Somers als Bartender (uncredited) |
| Martin Strader als Bar Patron (uncredited) |
| Clive Donner | Director |
| Harold F. Kress | Editor |
| Donfeld | Costume Design |
| Albert Brenner | Production Design |
| Murray Schisgal | Theatre Play |
| Ernest Laszlo | Director of Photography |
| Martin Manulis | Producer |
| Gerry Mulligan | Original Music Composer |
| Elliott Baker | Writer |
| Frank Tuttle | Set Decoration |
| Jeremy Lepard | Title Designer |
| Gordon Carroll | Executive Producer |
| Virginia Jones | Hairstylist |
| Ben Lane | Makeup Supervisor |
| Howard Pine | Unit Production Manager |
| David Salven | First Assistant Director |
| Steve Siporin | Second Assistant Director |
| Richard Lawrence | Other |
| Jack Haynes | Sound |
| William Randall | Sound |
| Charles J. Rice | Sound Supervisor |
| Geza Gaspar | Special Effects |
| Robert Willoughby | Still Photographer |
| Betty Levin | Script Supervisor |
| Alan DeWitt | Dialogue Coach |
| Benjamin Jackson | Title Designer |
