Kim Yun-ja (Korean: 김연자; Hanja: 金練子, born May 15, 1963) is a retired female badminton player from South Korea.

She is the last player to win All England Open titles in both singles and doubles.

In 1989, Kim married Sung Han-kook, a fellow world-class player who later went on to become the national team head coach.

[2] Kim was one of a Korean finest women's badminton player in early 1980's where she won 2 bronzes in women's singles and 2 silvers in women's doubles at 1982 Asian Games and 1986 Asian Games.

[5][6] In the World Championships, Kim won two bronze medals in women's doubles, one at the 1985 IBF World Championships with Yoo Sang-hee[7], and another at the 1987 IBF World Championships with Chung So-young.