Horst Buchholz
— Johann Strauss Jr.
Mary Costa
— Jetty Treffz
Nigel Patrick
— Johann Strauss Sr.
Yvonne Mitchell
— Anna Strauss
Rossano Brazzi
— Tedesco
Susan Robinson
— Emilie Trampusch
George Howe
— Karl Frederick Hirsch
Vicki Woolf
— Lili Weyl
James Faulkner
— Josef Strauss
Lauri Lupino Lane
— Donmayer
Paola Loew
— Princess Pauline Metternich
Ingrid Wayland
— Theresa Strauss
Hermione Farthingale
— Louise
Marty Allen
— Johann Herbeck
Lorna Nathan
— Olga
Elizabeth Muthsam
— Caroline Strauss
Guido Wieland
— Max Steiner
Willard Parker
— Karl Treffz
Prince Johannes Schonburg-Hartenstein
— Emperor Franz-Josef
Franz Aigner
— Josef Weyl
Michael Tellering
— Karl Haslinger
Ken Barrie
— Johann Strauss Jr. (Singing voice, uncredited)