Grigory Mikhaylovich Semyonov, or Semenov (Russian: ?????´??? ????´?????? ???????; September 13 (25), 1890 – August 30, 1946), was a Japanese-supported leader of the White movement in Transbaikal and beyond from December 1917 to November 1920, Lieutenant General and Ataman of Baikal Cossacks (1919).