Sergei Gennadyevich Kormiltsev (; born 22 January 1974) is a Russian and Ukrainian football coach and a former player.
Kormiltsev made his debut for Russia on 18 November 1998 in a friendly against Brazil. After moving to play in Ukraine, he started to play for Ukraine national team and won 15 caps.
He was one of the players and coaches named by Professional Football League on 1 September 2010 as making bets on their own team's results. He was fired by the team shortly after.