This chapter will show that although Warsaw is not a city readily associated with the global success of operetta, it was the place where operetta performances were not only popular but lucrative, and that they rivalled Vienna and Berlin with the quality of their productions and star-studded casts. Before World War I, operetta had no competition in Warsaw: it had publicity, stars, excellent productions, stunning stage sets and the latest lighting and stage equipment. Polish musicians, actors and directors had direct links with European theatres, and Warsaw was close to such operetta centres as Vienna, Berlin and Budapest. Warsaw operetta divas were celebrities adored by the public and critics alike. Some of them died leaving astronomical fortunes and lasting memories and recordings, some died tragically, and some died in complete oblivion. The chapter will look at the most significant operetta theatre not only in Warsaw but arguably in the whole of Poland, Teatr Nowosci, and some of the people who made it one of the city’s biggest attractions: Ludwik Sliwinski, Wiktoria Kawecka, Kazimira Niewiarowska, Jósef Redo and Lycina Messal.