Ralph Benatzky (5 June 1884, (Mährisch) Budwitz (Czech: Moravské Budějovice)), Moravia, Austrian Empire – 16 October 1957), born in Moravské Budějovice as Rudolf Josef František Benatzki, was an Austrian composer of Czech origin. He composed operas and operettas, such as Casanova (1928), Die drei Musketiere (1929), Im weißen Rössl (1930), and Meine Schwester und ich (1930). He died in Zürich, Switzerland.