Ethel Merman
— Sally Adams
Donald O'Connor
— Kenneth Gibson
Vera-Ellen
— Princess Maria
George Sanders
— Cosmo Constantine
Billy De Wolfe
— Pemberton Maxwell
Helmut Dantine
— Prince Hugo
Walter Slezak
— August Tantinnin
Steven Geray
— Prime Minister Sebastian
Ludwig Stössel
— Grand Duke Otto
Lilia Skala
— Grand Duchess Sophie
Charles Dingle
— Senator Brockway
Emory Parnell
— Senator Gallagher
Percy Helton
— Senator Wilkins
Bess Flowers
— Lady Seated Behind Duchess (uncredited)
Oskar Beregi
— Chamberlain (uncredited)
George Chakiris
— Dancer in The Ocarina Number (uncredited)
James Conaty
— Guest at Sally's Party (uncredited)
Sayre Dearing
— Ball Guest (uncredited)
Sam Harris
— Townsman at Fair (uncredited)
Torben Meyer
— Rudolph (uncredited)
Forbes Murray
— Ball Guest (uncredited)
Jeffrey Sayre
— Ball Guest (uncredited)
Bert Stevens
— Ball Guest (uncredited)
Harold Miller
— (uncredited)
Barrie Chase
— Dancer (uncredited)