Robert Morse as J. Pierpont Finch

Michele Lee as Rosemary Pilkington

Rudy Vallee as Jasper B. Biggley

Scooter Teague as Bud Frump

Maureen Arthur as Hedy LaRue

John Myhers as Bert O. Bratt

Carol Worthington as Lucille Krumholtz

Kathryn Reynolds as Miss Smith aka Smitty

Ruth Kobart as Miss Jones

Sammy Smith as Twimble / Wally Womper

Jeff DeBenning as Gatch

Janice Carroll as Brenda

Robert Q. Lewis as Tackaberry

Paul Hartman as Toynbee

Dan Tobin as Johnson

John Holland as Matthews

Justin Smith as Jenkins

Murray Matheson as Benjamin Ovington

Patrick O'Moore as Media Man No. 1

Lory Patrick as Receptionist

Wally Strauss as Media Man No. 2

Hy Averback as 2nd Junior Executive

George Fenneman as TV Announcer

Carl Princi as 1st Junior Executive

Sheila Rogers as 1st Girl

Robert Sweeney as 3rd Junior Executive

Ivan Volkman as The President

Ron Charles as Broker (uncredited)

Erin O'Brien-Moore as Mrs. Frump (uncredited)

Robert Osborne as Junior Executive (uncredited)

Anne Seymour as Gertrude Biggley (uncredited)

Walter Bacon as Treasure Hunter (uncredited)

Jack Berle as Treasure Hunter (uncredited)

George Boyce as Reunion Guest (uncredited)

Paul Bradley as TV Board Member / Junior Executive / Dancer (uncredited)

George Bruggeman as Party Guest (uncredited)

Albert Cavens as Treasure Hunter (uncredited)

Dick Cherney as Elevator Passenger (uncredited)

Bud Cokes as Treasure Hunter (uncredited)

Robert Cole as Executive (uncredited)

George DeNormand as TV Board Member (uncredited)

Richard Elmore as Reunion Guest (uncredited)

Joey Faye as Taxi Driver (uncredited)

Charles Fogel as Reunion Guest (uncredited)

Kenneth Gibson as Reunion Guest (uncredited)

Bobby Gilbert as Treasure Hunter (uncredited)

George Golden as Treasure Hunter (uncredited)

James Gonzalez as Party Guest (uncredited)

Bart Greene as Reunion Guest (uncredited)

George Holmes as Party Guest (uncredited)

Kathryn Janssen as Treasure Hunter (uncredited)

Don Koll as Executive (uncredited)

Al Nesor as Newseller (uncredited)

Barry O'Hara as Executive (uncredited)

Norman Palmer as Party Guest (uncredited)

Howard Parker as Dancer (uncredited)

Paul Power as Treasure Hunter (uncredited)

Anthony Redondo as Bartender (uncredited)

Frieda Rentie as Worker (uncredited)

Al Roberts as Party Guest (uncredited)

Victor Romito as Reunion Guest (uncredited)

Jerry Rush as Executive (uncredited)

Mark Russell as Worker (uncredited)

Virginia Sale as Cleaning Woman (uncredited)

Bernard Sell as Reunion Guest (uncredited)

Tucker Smith as Passerby / Dancing Executive (uncredited)

Norman Stevans as Elevator Passenger (uncredited)

Robert Strong as Elevator Man (uncredited)

David Swift as Elevator Operator (uncredited)

Hal Taggart as TV Board Member (uncredited)

Arthur Tovey as Minister with Large Bible (uncredited)

Helen Verbit as Mrs. Needlebaum - Finch's Landlady (uncredited)