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| Country (sports) |  South Korea |
|---|---|
| Residence | Seoul, Korea |
| Born | 2 April 1979 Andong, Korea |
| Height | 1.67 m (5 ft 6 in) |
| Turned pro | 1996 |
| Retired | 2008 |
| Plays | Right-handed (two-handed backhand) |
| Prize money | $603,590 |
| Singles | |
| Career record | 255–180 |
| Career titles | 5 ITF |
| Highest ranking | No. 45 (14 July 2003) |
| Grand Slam singles results | |
| Australian Open | 2R (2003) |
| French Open | 1R (2002, 2003, 2005) |
| Wimbledon | 2R (2003, 2005) |
| US Open | 3R (2002, 2005) |
| Doubles | |
| Career record | 116–84 |
| Career titles | 1 WTA, 10 ITF |
| Highest ranking | No. 98 (22 September 2003) |
| Grand Slam doubles results | |
| Australian Open | 1R (1999, 2006) |
| French Open | 1R (2005) |
| Wimbledon | 1R (1998, 2004) |
| US Open | 2R (2003) |
Cho Yoon-jeong (Korean: 조윤정, born 2 April 1979) is a South Korean former tennis player.
In her career, she won one doubles title on the WTA Tour, at Seoul in 2004. Her best Grand Slam performance came when she made the third round of the 2005 US Open by defeating Arantxa Parra Santonja in three sets in the first round, upsetting the 27th seed Gisela Dulko in the second round, before she fell to No. 7, Justine Henin. She reached career-high WTA rankings of No. 45 in singles (in July 2003), and No. 98 in doubles (in September 2003).
Yoon-jeong retired from professional tennis in 2008.