Sergey Nikolayevich Karyakin (Russian: Сергей Николаевич Карякин; born 5 January 1988) is a Russian modern pentathlete.

He held the individual world title in 2010 and the team world title in 2011, finishing second in relay in 2009 and 2011.

[2] Karyakin started as a swimmer and competed in biathlon (swimming and running) before changing to modern pentathlon and winning the junior world title in 2008.

His strongest event is swimming and weakest is fencing.

[1] He shares his name with two other sportsmen, in chess and rally racing.