Konstantin Nikolayevich Korneyev (; born June 5, 1984) is a Russian former professional ice hockey defenceman. He was selected in the ninth round, 275th overall, by the Montreal Canadiens in the 2002 NHL Entry Draft.
Drafted by the Montreal Canadiens of the National Hockey League (NHL) in 2002(9th round, 275th overall), Korneyev has played with Krylya Sovetov Moscow, Ak Bars Kazan and CSKA Moscow in Russia, but has not played in the NHL. He wins Russian Superleague 2006 with Ak Bars. During the summer of 2011 he was removed as a prospect from the Montreal Canadiens website indicating a possible rupture in their association, however this has not yet been verified.
On December 24, 2010, he was traded from HC CSKA Moscow to Ak Bars Kazan for defenseman Vyacheslav Buravchikov and a financial compensation.
He played for the Russian national team at the 2008 IIHF World Championship, 2009 IIHF World Championship, 2010 IIHF World Championship where he won two gold medals and a silver medal with the team.