Sergei Afanasyevich Kolosov (Russian: ?????ยด? ??????????? ???????; born May 22, 1986) is a Belarusian former ice hockey defenceman.
He last played with Generals Kiev of the Ukrainian Hockey League.
Kolosov was drafted by the Detroit Red Wings of the National Hockey League (NHL) in 2004, and signed a contract with the team on June 25, 2008.
He played for the Belarusian national team at the 2008, 2010, and 2011 World Championships, as well as the 2010 Winter Olympics.