Sergei Valerievich Kharitonov (Russian: Серге́й Валерьевич Харитонов, Sergey Valerievich Haritonov, Russian pronunciation: ) (born August 18, 1980) is a Russian Heavyweight mixed martial artist and former kickboxer currently competing for Bellator MMA, M-1 Global and GLORY. A professional MMA competitor since 2000, he has previously fought in Japanese MMA organizations PRIDE Fighting Championships, DREAM (Both in Japan) and Strikeforce, which was based in the United States.
Kharitonov has competed in two major mixed martial arts tournaments and one major kickboxing tournament. He holds notable wins over former EliteXC Middleweight Champion Murilo Rua, former K-1 Champion Semmy Schilt, former Strikeforce Heavyweight Champion Alistair Overeem, and former UFC Heavyweight Champions Andrei Arlovski and Fabrício Werdum.
As of 11 May 2015, Kharitonov is ranked the #3 Heavyweight kickboxer in the world by GLORY.