Die Csárdásfürstin or A Csárdáskirálynő (literally The Csárdás Princess; translated into English as The Riviera Girl and The Gipsy Princess) is an operetta in 3 acts by Hungarian composer Emmerich Kalman, libretto by Leo Stein and Béla Jenbach. It premiered in Vienna at the Johann Strauss Theater, 17 November 1915. Numerous film versions and recordings have been made. The operetta is widely beloved in Hungary, Austria, Germany, all of Europe and particularly in former Soviet Union, where it had been adapted into a hugely popular film. It is arguably Kálmán's most successful work.