Semyon Trofimovich Bychkov (Russian: ????? ?????????? ??????; 15 May 1918 – 4 November 1946) was a Soviet military pilot during World War II.
He served first in Soviet Air Forces, where he downed seventeen German aircraft, then on the opposite side.
Bychkov co-founded the 1st Aircraft Regiment of the Committee of Liberation Movement of People of Russia, under the auspices of Russian Liberation Army (ROA) and was awarded the German Ostvolk Medal 2nd class with swords.
In April 1945, Bychkov surrendered to the Third United States Army and was then handed over to the Soviet forces.
He was tried as a traitor and executed by firing squad, being posthumously stripped of all Soviet awards on 21 March 1947.