Mun Ji-yun (Korean: 문지윤, born 19 April 1971) is a South Korean judoka. She competed in the women's heavyweight event at the 1992 Summer Olympics.^[1]

She finished fifth at the 1989 World Judo Championships, won the 1991 World Judo Championships +72 kg class, and won a bronze medal at the 1993 World Judo Championships. On the continental level she won the silver medal at the 1988 Asian Judo Championships (as well as a bronze medal in the open class) and a bronze medal at the 1990 Asian Games.^[2]