Sergei Valerievich Kharitonov is a Russian professional boxer, mixed martial artist and former kickboxer. A professional MMA competitor since 2000, Kharitonov has previously fought in Japanese MMA organizations PRIDE Fighting Championships & DREAM, Bellator MMA, M-1 Global, Strikeforce, and GLORY.

PRIDE Fighting Championships was a Japanese mixed martial arts promotion company. Its inaugural event was held at the Tokyo Dome on October 11, 1997. Pride held more than sixty mixed martial arts events, broadcast to about 40 countries worldwide. PRIDE was owned by the holding company Dream Stage Entertainment (DSE).