Sergei Mikhailovich Pleshakov (Russian : , born 2 November 1957) is a retired Russian field hockey defender. Together with his twin brother Vladimir he competed in the 1980, 1988 and 1992 Summer Olympics and won a bronze medal in 1980.
In 1975 Pleshakov started playing for the club Torpedo Syzran, but in 1977 moved to SKA Sverdlovsk, where he was serving with the Soviet Army. He retired in 1994 to become a coach of SKA Sverdlovsk. The team was disbanded in 1998, and Pleshakov became an association football administrator.