Choi Kyung-Ju (born May 19, 1970) is a South Korean professional golfer. He is known as K. J. Choi in many countries. He is the most internationally successful Asian male golfer of all time, though he has not achieved the same level of success as several of his South Korean female compatriots such as LPGA hall of fame player Se Ri Pak and Grace Park have in women's golf.

Choi was born in Wando, South Korea. 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.

Choi won Jack Nicklaus's Memorial Tournament in 2007. He mentioned on CBS during the AT&T National that he read Jack Nicklaus's "Golf My Way" book early in his golf career, which assisted him in becoming the golfer he is today.