Jack Webb as Pete Kelly

Janet Leigh as Ivy Conrad

Edmond O'Brien as Fran McCarg

Peggy Lee as Rose Hopkins

Andy Devine as George Tenell

Lee Marvin as Al Gannaway

Ella Fitzgerald as Maggie Jackson

Martin Milner as Joey Firestone

Than Wyenn as Rudy Shulak

Herbert Ellis as Bedido

John Dennis as Guy Bettenhouser

Jayne Mansfield as Cigarette Girl

Mort Marshall as Cootie Jacobs

Moe Schneider as Trombonist (Big 7)

George Van Eps as Guitarist (Big 7)

Ray Sherman as Pianist (Big 7)

Dick Cathcart as Trumpet Player / Webb's Cornet Double

Matty Matlock as Clarinetist (Big 7)

Eddie Miller as Saxophonist (Big 7)

Nick Fatool as Drummer (Big 7)

Jud De Naut as Bassist (Big 7)

Nesdon Booth as Squat Henchman (uncredited)

Perry Botkin Sr. as Tuxedo Band Member (uncredited)

Teddy Buckner as Cornet Soloist (uncredited)

Harper Goff as Tuxedo Band Banjo Player (uncredited)

Jester Hairston as Mourner (uncredited)

Donald Kerr as Drunk in Speakeasy (uncredited)

Hank Mann as Argumentative Husband in Speakeasy (uncredited)

Harry 'Snub' Pollard as Waiter (uncredited)

Joe Venuti as Tuxedo Band Member (uncredited)