Choi Kyung-Ju (Korean: 최경주, born 19 May 1970), also known as K. J. Choi. is a South Korean professional golfer who currently plays on the PGA Tour. Since turning pro in 1994, he has won a total of eighteen professional golf tournaments worldwide, including eight on the PGA Tour, making him Asia's most successful golfer. His most notable victory came at the 2011 Players Championship. He has spent 40 weeks in the top-10 of the world rankings.
After establishing his career on the Asian Tour, where he picked up his first professional win at the 1996 Korean Open, and the Japan Golf Tour, where he won twice in 1999, Choi qualified for membership of the U.S. based PGA Tour by finishing tied 35th at the 1999 qualifying tournament. He was the first Korean to earn a PGA Tour card. In his rookie season in 2000 he finished 134th on the money list and had to requalify, but since 2001 he has been a consistent performer on the tour. In 2002 he became the first Korean to win on the PGA Tour at the Compaq Classic of New Orleans, and followed this up with another win at the Tampa Bay Classic in the same year.
In 2003 he won the Linde German Masters on the European Tour, his first and only win to date on the European Tour.