Sergey Karjakin (born 12 January 1990 in Simferopol) is a Russian (formerly Ukrainian) chess grandmaster.
He was a chess prodigy and holds the record for the youngest grandmaster in history, at the age of twelve years and seven months.
On 25 July 2009 Karjakin adopted Russian citizenship and afterwards played for Russia.
He won Candidates Tournament 2016 and earned the right to challenge for the World Chess Championship. In November 2016, he lost the championship match to Magnus Carlsen in the rapid tiebreaks after drawing 6–6 in the classical games. He won the 2016 World Blitz Chess Championship. He played in the candidates tournament again in 2018, coming third.