Kim Dong-Sung (Hangul: 김동성, Hanja: 金東聖) (born 9 February 1980 in Seoul, South Korea) is a former South Korean short track speed skater. He won a gold medal in 1000m race and silver medal in 5000m relay at the 1998 Winter Olympics. He has been a two-time Overall World Champion in 1997 and in 2002 and two-time Overall World Cup Champion (1999-2000, 2001-2002).

Kim Dong-sung was born in Seoul, the third of three children of Kim Tae-young and his wife Yoo Young-hee. Kim started skating and competing in long track when he was seven years old, but switched to short track two years later.

In February 1996, Kim was first called up to the South Korean national team and made his senior debut at the Asian Winter Games in Harbin, China at the age of 16, where he won the gold medal in the men's 5000 metre relay together with Olympic champions Chae Ji-hoon and Song Jae-kun, and three medals in the individual events. In March 1996, Kim also made his first appearance at the World Championships in The Hague, where he won bronze as a member of the 5000 metre relay team.

In January 1997, Kim competed in the World Junior Short Track Speed Skating Championships held in Marquette, Michigan. In the tourney, Kim won all five events (overall, 500 m, 1000 m, 1500 m, 1500 m super final), easily dominating all other competitors including Rusty Smith, François-Louis Tremblay and Dan Weinstein every race. Kim set two world junior records at the championships. On January 11, he broke the 500 m world junior record, recording a time of 43.491 seconds. Next day, Kim would set another world junior record in the 1500 m super final, skating the 1500 m in 2:19.828.

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