Otto Grotewohl (German pronunciation: [ˈɔtoː ˈɡʁoːtəvoːl]; 11 March 1894 – 23 September 1964) was an (East) German politician. He was co-chairman of the Socialist Unity Party of Germany (SED) from 1946 to 1950 (together with Wilhelm Pieck), and the first prime minister of the German Democratic Republic from 1949 until his death in 1964.