| Lee Sung-jea | |
| Birth Date: | 1968 3, df=yes[1] |
| Birth Place: | South Korea |
| Youthclubs1: | Sangji University |
| Years1: | 1993 |
| Clubs1: | Korail FC |
| Manageryears1: | 2005–2006 |
| Managerclubs1: | Afghanistan U-20 |
| Manageryears2: | 2007 |
| Managerclubs2: | Afghanistan U-23 |
| Manageryears3: | 2014–2015 |
| Managerclubs3: | South Sudan |
| Manageryears4: | 2016– |
| Managerclubs4: | Bhutan (women's) |
| Hangul: | 이성제 |
| Rr: | I Seongje |
| Mr: | Ri Sŏngje |
| Koreanipa: | iː.sʰʌŋ.dʑɛ |
Lee Sung-jea (pronounced as /ko/; born on 29 March 1968) is a South Korean football manager and former player.
He played for Korail FC in Korea National League.
He was appointed as a South Sudan manager in 2014.[2]