Horst Buchholz as Johann Strauss Jr.

Mary Costa as Jetty Treffz

Nigel Patrick as Johann Strauss Sr.

Yvonne Mitchell as Anna Strauss

Rossano Brazzi as Tedesco

Susan Robinson as Emilie Trampusch

George Howe as Karl Frederick Hirsch

Vicki Woolf as Lili Weyl

James Faulkner as Josef Strauss

Lauri Lupino Lane as Donmayer

Paola Loew as Princess Pauline Metternich

Ingrid Wayland as Theresa Strauss

Hermione Farthingale as Louise

Marty Allen as Johann Herbeck

Lorna Nathan as Olga

Elizabeth Muthsam as Caroline Strauss

Guido Wieland as Max Steiner

Willard Parker as Karl Treffz

Prince Johannes Schonburg-Hartenstein as Emperor Franz-Josef

Franz Aigner as Josef Weyl

Michael Tellering as Karl Haslinger

Ken Barrie as Johann Strauss Jr. (Singing voice, uncredited)