| Jung Yoon-sung | |
| Birth Date: | 1 June 1984 |
| Birth Place: | South Korea |
| Position: | Forward |
| Youthyears1: | 2000–2002 |
| Youthclubs1: | Suwon Technical High School |
| Years1: | 2003–2007 |
| Caps1: | 12 |
| Goals1: | 1 |
| Years2: | 2005–2006 |
| Clubs2: | → Gwangju Sangmu (army) |
| Caps2: | 31 |
| Goals2: | 4 |
| Years3: | 2007–2008 |
| Clubs3: | Gyeongnam FC |
| Caps3: | 24 |
| Goals3: | 7 |
| Years4: | 2009–2011 |
| Caps4: | 35 |
| Goals4: | 5 |
| Totalcaps: | 102 |
| Totalgoals: | 17 |
| Pcupdate: | 14 July 2011 |
| Hangul: | 정윤성 |
| Hanja: | 鄭允成 |
| Rr: | Jeong Yun-seong |
| Mr: | Chŏng Yun-sŏng |
Jung Yoon-sung (born June 1, 1984) is a South Korean football forward.
He formerly played for Suwon Samsung Bluewings, Gwangju Sangmu, Gyeongnam FC and Chunnam Dragons. Jung was accused of involvement in the league match-fixing scandal on 24 June 2011.[1]