Sergei Kostitsyn is a Belorussian winger on the Nashville Predators.
Kostitsyn was drafted by Montreal in 2005, two years after his older brother. Kostitsyn played junior hockey in the OHL after being drafted, putting up 131 points in 2006-07 with the London Knights. He broke into the NHL in 2007-08, finishing the season with 9 goals and 27 points. He played 56 games for the Habs the following year, and had 23 points. He and his brother fell out of favor in Montreal, and while Andrei remained with the Canadiens, Sergei was limited to just 47 games in 2009-10, and was traded to Nashville for the rights to goalie Dan Ellis during the 2010 offseason.
Sergei has played at 9 different international junior tournaments for Belarus, as well as the 2008 World Championships.