Yoo Jung-nam (also Yu Jeong-nam, Korean: 유 정남; born 12 September 1983) is a South Korean swimmer, who specialized in butterfly events. He represented his nation South Korea at the 2008 Summer Olympics, and has won a career total of four medals (one silver and three bronze) in a major international competition, spanning the 2002 Asian Games and the 2005 East Asian Games. Yoo is also a member of the swimming team and a graduate of physical education at Seoul National University.