Lee Chun-Soo (Hangul: 이천수) (born 9 July 1981) is a football player from South Korea. He was a key member of his national team during the 2002 World Cup and the 2004 Summer Olympics. He also wrote a book on his World Cup experience, accusing former national team coach Guus Hiddink of excessively using foul language with players. Known for his controversial off-field comments to the media, Lee also criticized several teammates in the book.
After the World Cup, Lee moved to Real Sociedad of Spain, becoming the first Korean to play in the Spanish La Liga. However, after a season of mediocre performances, Lee was moved on loan to fellow Spanish side Numancia, before returning to Ulsan Hyundai Horang-i of South Korea's K-League.
Though Lee joined Ulsan in the middle of the season, his performance proved to be invaluable to Ulsan's triumph as the champions of the 2005 season with a hat-trick in the first leg of the league finals. He subsequently was named the K-League's Most Valuable Player on December 28, 2005.
In the 2006 World Cup, he scored South Korea's first goal with a free-kick against Togo in a 2-1 win.
July 2008, Feyenoord officially announced that Lee's loan to Korean powerside Suwon Samsung Bluewings for 1 year deal.