Donald O'Connor
— Melvin Hoover
Debbie Reynolds
— Judy Schneider / Judy LeRoy
Una Merkel
— Mom Schneider
Richard Anderson
— Harry Flack
Allyn Joslyn
— Frank Schneider
Les Tremayne
— Mr. Henneman
Noreen Corcoran
— Clarabelle Schneider
Jim Backus
— Mergo
Barbara Ruick
— Studio Guide
Robert Taylor
— Himself, Cameo Appearance in Judy's Dream
Nesdon Booth
— Police Captain (uncredited)
Steve Forrest
— Photographer on Crane (uncredited)
Robert Fuller
— Acrobatic Cheerleader (uncredited)
Ned Glass
— Theatre Manager (uncredited)
Lyn Wilde
— Telephone Girl (uncredited)
Melba Snowden
— Bit Role (uncredited)