Sergey Kazakov (b. July 08, 1976 ) is a former Russian amateur boxer best known for winning the World Championships 2003 and European Championships 1998, 2002 and 2004 at Light Flyweight.
The 5' 7" Kazakov won the European Championships in 1998. In 2000 he lost at the European Championships to Valeri Sidorenko in the finals and at the Olympics 2000 against reigning world champ Brian Viloria 6-8 in the first round. In 2003 he won the World Championships with a close final victory against future star Zou Shiming 23:19. He added a victory at the European championships 2002 and 2004 by beating Alfonso Pinto. 2004 at the Olympics he was upset by young Turkish boxer Atagün Yalçınkaya and had to settle for bronze. In 2005 at the world championships he again lost to a teenager in Hungary's Pal Bedak.
2000 (Sydney, as a Light flyweight)
- Lost to Brian Viloria (United States) 6-8
2004 (Athens, as a Light flyweight)