Kosei Inoue is a retired Japanese judoka, born on June 15, 1978, in Kumamoto, Japan. He is best known for his achievements in the sport of judo, particularly in the 100 kg weight category. Inoue won a gold medal at the 2000 Sydney Olympics and is a three-time world champion, securing titles in 1999, 2001, and 2003. After retiring from competitive judo, Inoue transitioned to coaching and has contributed to the development of judo in Japan. He has also been involved in various sports organizations, promoting judo and inspiring future generations of athletes.