Moon Dae-Sung (born September 3, 1976) is a retired 6 ft 3 in (1.91 m) 200 lb (91 kg) Olympic taekwondo athlete from South Korea.

He entered Dong-A University on a taekwondo scholarship in 1995 and performed consistently well in national competitions during his college years, though usually overshadowed by the dominant heavyweight champion Kim Je-Gyoung.

Upon graduation from Dong-A University in Busan, South Korea in 1999, Moon became a member of the Samsung Corporation Professional Taekwondo team.

Since his high profile win at the Athens Olympic Games, Moon has become a well known celebrity in South Korea, owing to his performance in the Gold Medal round.

[2] His doctoral thesis for Kookmin University, "Effect of Proprioceptive Neuromuscular Facilitation (PNF) on Flexibility and Isokinetic Muscle Strength in Taekwondo Player", came to the attention of the public media in South Korea as a "copy-and-paste" plagiarism.