Robert Anton Winterberg (27 February 1884 – 22 June 1930) was an Austrian composer, conductor, pianist, and theatre director. He is best known as a composer of German-language operettas, most of which he created during the 1910s and 1920s. Two of his operettas were adapted into English for Broadway: Die Dame in Rot (1911, Vienna) as The Lady in Red (1919, Lyric Theatre) and Die schöne Schwedin (1915, Vienna) as The Girl from Brazil (1916, 44th Street Theatre). His most successful operettas in Europe were Die Dame vom Zirkus (1919) and Günstling der Zarin (1921).