 | Robert Morse als J. Pierpont Finch |
 | Michele Lee als Rosemary Pilkington |
 | Rudy Vallee als Jasper B. Biggley |
 | Scooter Teague als Bud Frump |
 | Maureen Arthur als Hedy LaRue |
 | John Myhers als Bert O. Bratt |
 | Carol Worthington als Lucille Krumholtz |
 | Kathryn Reynolds als Miss Smith aka Smitty |
 | Ruth Kobart als Miss Jones |
| Sammy Smith als Twimble / Wally Womper |
| Jeff DeBenning als Gatch |
| Janice Carroll als Brenda |
 | Robert Q. Lewis als Tackaberry |
 | Paul Hartman als Toynbee |
 | Dan Tobin als Johnson |
 | John Holland als Matthews |
| Justin Smith als Jenkins |
 | Murray Matheson als Benjamin Ovington |
 | Patrick O'Moore als Media Man No. 1 |
 | Lory Patrick als Receptionist |
| Wally Strauss als Media Man No. 2 |
| Hy Averback als 2nd Junior Executive |
| George Fenneman als TV Announcer |
| Carl Princi als 1st Junior Executive |
| Sheila Rogers als 1st Girl |
| Robert Sweeney als 3rd Junior Executive |
| Ivan Volkman als The President |
| Ron Charles als Broker (uncredited) |
 | Erin O'Brien-Moore als Mrs. Frump (uncredited) |
 | Robert Osborne als Junior Executive (uncredited) |
 | Anne Seymour als Gertrude Biggley (uncredited) |
| Walter Bacon als Treasure Hunter (uncredited) |
 | Jack Berle als Treasure Hunter (uncredited) |
 | George Boyce als Reunion Guest (uncredited) |
 | Paul Bradley als TV Board Member / Junior Executive / Dancer (uncredited) |
| George Bruggeman als Party Guest (uncredited) |
| Albert Cavens als Treasure Hunter (uncredited) |
| Dick Cherney als Elevator Passenger (uncredited) |
| Bud Cokes als Treasure Hunter (uncredited) |
| Robert Cole als Executive (uncredited) |
| George DeNormand als TV Board Member (uncredited) |
| Richard Elmore als Reunion Guest (uncredited) |
 | Joey Faye als Taxi Driver (uncredited) |
| Charles Fogel als Reunion Guest (uncredited) |
| Kenneth Gibson als Reunion Guest (uncredited) |
| Bobby Gilbert als Treasure Hunter (uncredited) |
| George Golden als Treasure Hunter (uncredited) |
| James Gonzalez als Party Guest (uncredited) |
| Bart Greene als Reunion Guest (uncredited) |
 | George Holmes als Party Guest (uncredited) |
| Kathryn Janssen als Treasure Hunter (uncredited) |
| Don Koll als Executive (uncredited) |
| Alan Marston als Reunion Guest (uncredited) |
| Al Nesor als Newseller (uncredited) |
| Barry O'Hara als Executive (uncredited) |
| Norman Palmer als Party Guest (uncredited) |
| Howard Parker als Dancer (uncredited) |
| Paul Power als Treasure Hunter (uncredited) |
| Anthony Redondo als Bartender (uncredited) |
| Frieda Rentie als Worker (uncredited) |
| Al Roberts als Party Guest (uncredited) |
| Victor Romito als Reunion Guest (uncredited) |
| Jerry Rush als Executive (uncredited) |
 | Mark Russell als Worker (uncredited) |
 | Virginia Sale als Cleaning Woman (uncredited) |
 | Bernard Sell als Reunion Guest (uncredited) |
 | Tucker Smith als Passerby / Dancing Executive (uncredited) |
| Norman Stevans als Elevator Passenger (uncredited) |
| Robert Strong als Elevator Man (uncredited) |
 | David Swift als Elevator Operator (uncredited) |
 | Hal Taggart als TV Board Member (uncredited) |
 | Arthur Tovey als Minister with Large Bible (uncredited) |
| Helen Verbit als Mrs. Needlebaum - Finch's Landlady (uncredited) |
| David Swift | Director |
| David Swift | Writer |
| Walter Mirisch | Executive Producer |
| Irving Temaner | Associate Producer |
| David Swift | Producer |
| Nelson Riddle | Original Music Composer |
| Burnett Guffey | Director of Photography |
| Shirley Mellner | Casting |
| Ralph E. Winters | Editor |
| Robert F. Boyle | Art Direction |
| Edward G. Boyle | Set Decoration |
| Allan Jacobs | Editor |
| Frank Loesser | Songs |
| Frank Loesser | Lyricist |
| Shepherd Mead | Novel |
| Abe Burrows | Book |
| Jack Weinstock | Book |
| Willie Gilbert | Book |
| Micheline | Costume Design |
| Robert J. Schiffer | Makeup Artist |
| Fae M. Smith | Hairstylist |
| Nate H. Edwards | Unit Manager |
| Allen K. Wood | Production Supervisor |
| John D. Bloss | Assistant Director |
| Michael J. Dmytryk | Assistant Director |
| Mary Blair | Color Designer |
| Sam Gordon | Property Master |
| William Maldonado | Construction Coordinator |
| James D. Young | Assistant Sound Editor |
| James Richard | Sound Editor |
| Clem Portman | Sound Re-Recording Mixer |
| Robert Martin | Sound |
| Virgil Partch | Visual Effects |
| Don Stott | Gaffer |
| Leslie Hall | Costumer |
| Ed Ware | Costumer |
| Richard Carruth | Music Editor |
| Jimmy Joyce | Vocal Coach |
| Nelson Riddle | Music Supervisor |
| Nelson Riddle | Conductor |
| William C. Carruth | Assistant Music Supervisor |
| Marie Kenney | Script Supervisor |
| Abe Burrows | Stage Director |
| Bob Fosse | Choreographer |
| Dale Moreda | Choreographer |
| Edward Folger | Production Assistant |
| Norman Stuart | Dialogue Coach |
| Charles Mulvehill | Production Assistant |
| Cy Feuer | Other |
| Ernest H. Martin | Other |
