Danny Kaye as Red Nichols

Barbara Bel Geddes as Wila Stutsman

Louis Armstrong as Louis Armstrong

Harry Guardino as Tony Valani

Bob Crosby as Wil Paradise

Bobby Troup as Artie Schutt

Susan Gordon as Young Dorothy Nichols

Tuesday Weld as Teenaged Dorothy Nichols

Ray Anthony as Jimmy Dorsey

Shelly Manne as Dave Tough

Ray Daley as Glenn Miller

Valerie Allen as Tommye Eden

Cindy Carol as Girl at Birthday Party

Robert Banas as Dancer at College Prom

Toby Michaels as Girl at Birthday Party

Charles Herbert as Patient

John Benson as Musician

Earl Barton as Choreographer

Herschel Graham as Hotel Guest (uncredited)