Sergey Prokofyevich Denisov (Russian: ?????? ??????????? ???????; 7 January [O.S.
25 December 1909] 1910 – 6 June 1971) was a Soviet fighter pilot during the Spanish Civil War who went on to hold various high commands during the Battles of Khalkhin Gol, the Soviet-Finnish War, and World War II in addition to being awarded the title Hero of the Soviet Union twice.