Ethel Merman as Sally Adams

Donald O'Connor as Kenneth Gibson

Vera-Ellen as Princess Maria

George Sanders as Cosmo Constantine

Billy De Wolfe as Pemberton Maxwell

Helmut Dantine as Prince Hugo

Walter Slezak as August Tantinnin

Steven Geray as Prime Minister Sebastian

Ludwig Stössel as Grand Duke Otto

Lilia Skala as Grand Duchess Sophie

Charles Dingle as Senator Brockway

Emory Parnell as Senator Gallagher

Percy Helton as Senator Wilkins

Bess Flowers as Lady Seated Behind Duchess (uncredited)

Oskar Beregi as Chamberlain (uncredited)

George Chakiris as Dancer in The Ocarina Number (uncredited)

James Conaty as Guest at Sally's Party (uncredited)

Sayre Dearing as Ball Guest (uncredited)

Sam Harris as Townsman at Fair (uncredited)

Torben Meyer as Rudolph (uncredited)

Forbes Murray as Ball Guest (uncredited)

Jeffrey Sayre as Ball Guest (uncredited)

Bert Stevens as Ball Guest (uncredited)

Harold Miller as (uncredited)

Barrie Chase as Dancer (uncredited)