Yoo Yong-sung(Korean: ???; Hanja: ???; born 25 October 1974) is a legendary badminton player from South Korea.
He is regarded as one of the most finest men's doubles players in the badminton history.Yoo competed for Korea in badminton at the 2004 Summer Olympics in men's doubles with partner Lee Dong-soo.
Yoo Yong Sung is a two-time Olympic silver medalist from Korea and is currently teaching in the Chinese national team as the head coach of men's doubles.