Jack Lemmon as C.C. Baxter

Shirley MacLaine as Fran Kubelik

Fred MacMurray as Jeff D. Sheldrake

Ray Walston as Joe Dobisch

Jack Kruschen as Dr. Dreyfuss

David Lewis as Al Kirkeby

Hope Holiday as Mrs. Margie MacDougall

Joan Shawlee as Sylvia

Naomi Stevens as Mrs. Mildred Dreyfuss

Johnny Seven as Karl Matuschka

Joyce Jameson as The Blonde

Willard Waterman as Mr. Vanderhoff

David White as Mr. Eichelberger

Edie Adams as Miss Olsen

Dorothy Abbott as Office Worker (uncredited)

Ralph Moratz as Office Worker (uncredited)

Joe Palma as Office Maintenance Man (uncredited)

Bill Baldwin as TV Movie Host (uncredited)

Benny Burt as Charlie - Bartender (uncredited)

Lynn Cartwright as Elevator Supervisor with Clicker (uncredited)

Mason Curry as Bit Part (uncredited)

David Macklin as Messenger (uncredited)

Hal Smith as Man in Santa Claus Suit (uncredited)

Paul Bradley as Office Worker (uncredited)

Steve Carruthers as Restaurant Patron (uncredited)

Dick Cherney as Bar Patron (uncredited)

Franklyn Farnum as Office Worker (uncredited)

Herschel Graham as Restaurant Patron (uncredited)

Lars Hensen as Office Worker (uncredited)

Eugene Jackson as Office Worker (uncredited)

Frances Weintraub Lax as Mrs. Lieberman (uncredited)

William Meader as Executive (uncredited)

Monty O'Grady as Office Worker (uncredited)

Paul Power as Bar Patron (uncredited)

Tony Regan as Executive (uncredited)

Clark Ross as Restaurant Patron (uncredited)

Norman Stevans as Office Worker (uncredited)

Sid Troy as Williams (uncredited)