James Stewart as Shep Henderson

Kim Novak as Gillian Holroyd

Jack Lemmon as Nicky Holroyd

Ernie Kovacs as Sidney Redlitch

Hermione Gingold as Bianca de Passe

Elsa Lanchester as Aunt Queenie Holroyd

Janice Rule as Merle Kittridge

Philippe Clay as French Singer at the Zodiac Club

Bek Nelson as Tina

Howard McNear as Andy White

Fred Aldrich as Mover (uncredited)

Leon Alton as Club Patron (uncredited)

Monty Ash as Herb Store Owner (uncredited)

Alex Ball as Club Patron (uncredited)

Joe Barry as Exterminator (uncredited)

Wolfe Barzell as Zodiac Club Proprietor (uncredited)

Gail Bonney as Betty - Merle's Maid (uncredited)

Don Brodie as Cab Driver (uncredited)

Robert Haines as Club Patron (uncredited)

James Lanphier as Waldo (uncredited)

Perk Lazelle as Club Patron (uncredited)

Ted Mapes as Gillian's Customer (uncredited)

Hans Moebus as Club Patron (uncredited)

Ollie O'Toole as Elevator Operator (uncredited)

John Truax as Cab Driver (uncredited)