Ko Sung-hyun (???; Korean pronunciation: [ko.s??.?j??]; born 21 May 1987) is an internationally elite badminton player from South Korea.
Ko Sung-hyun is a right-handed player who specializes in doubles events.
His current partner in the men's doubles is Shin Baek-cheol.
His best performances to date were at the 2010 Hong Kong Super Series where he won the men's doubles tournament with Yoo Yeong-seong and at the 2010 Paris World Championships where they reached the round of sixteen.
In mixed doubles Ko Sung-hyun and Ha Jung-eun reached the semifinals at the 2010 World Championships where they claimed the bronze medal.In 2014, Ko won his first Superseries title in mixed doubles with Kim Ha-na at the 2014 Australian Super Series.
Ko and Shin Baek-cheol won gold in 2014 BWF World Championships by defeating the first seed and also their own teammates, Lee Yong-dae and Yoo Yeon-seong.