| Hangul: | 김정주 |
| Rr: | Gim Jeong-ju |
| Mr: | Kim Chŏng-ju |
Kim Jung-joo (; born November 11, 1981, in Jinju, South Gyeongsang Province, South Korea) is a South Korean amateur boxer who won welterweight bronze medals at the 2004 Summer Olympics and 2008 Summer Olympics.
Kim received a Master's degree in physical education from Sangji University in South Korea.
He won a gold medal in welterweight at the 2002 Asian Games, beating Non Boonjumnong in the semifinals. Kim qualified for the Athens Games by winning the gold medal at the 2004 Asian Amateur Boxing Championships in Puerto Princesa, Philippines. In the final he defeated Uzbekistan's Sherzod Husanov.
He did not compete at the 2005 and 2007 world championships and was beaten in the first round at the 2006 Asian Games by Angkhan Chomphuphuang. He easily qualified for the 2008 Summer Olympics, though, by beating Davran Khabirov and Dilshod Mahmudov.
2003 World Championships
| style='border-style: none none solid solid; background: #e3e3e3; width: 18%' | Event | style='border-style: none none solid solid; background: #e3e3e3; width: 20%' | Round | style='border-style: none none solid solid; background: #e3e3e3; width: 10%' | Result | style='border-style: none none solid solid; background: #e3e3e3; width: 38%' | Opponent | style='border-style: none none solid solid; background: #e3e3e3; width: 14%' | Score |
|---|---|---|---|---|---|---|---|---|---|
| Welterweight | align='center' | First | bye | ||||||
| align='center' | Second | Win | align='left' |  Jari Fyhr | align='left' | 25-11 | |||
| align='center' | Third | Loss | align='left' |  Bakhtiyar Artayev | align='left' | 10-29 | |||
| style='border-style: none none solid solid; background: #e3e3e3; width: 18%' | Event | style='border-style: none none solid solid; background: #e3e3e3; width: 20%' | Round | style='border-style: none none solid solid; background: #e3e3e3; width: 10%' | Result | style='border-style: none none solid solid; background: #e3e3e3; width: 38%' | Opponent | style='border-style: none none solid solid; background: #e3e3e3; width: 14%' | Score |
|---|---|---|---|---|---|---|---|---|---|
| Welterweight | align='center' | First | bye | ||||||
| align='center' | Second | Win | align='left' |  Vitalie Gruşac | align='left' | 23-20 | |||
| align='center' | Quarterfinal | Win | align='left' |  Juan Camilo Novoa | align='left' | 25-23 | |||
| align='center'; bgcolor="#cc9966" | Semifinal | Loss | align='left' |  Lorenzo Aragon | align='left' | 10-38 | |||
| style='border-style: none none solid solid; background: #e3e3e3; width: 18%' | Event | style='border-style: none none solid solid; background: #e3e3e3; width: 20%' | Round | style='border-style: none none solid solid; background: #e3e3e3; width: 10%' | Result | style='border-style: none none solid solid; background: #e3e3e3; width: 38%' | Opponent | style='border-style: none none solid solid; background: #e3e3e3; width: 14%' | Score |
|---|---|---|---|---|---|---|---|---|---|
| Welterweight | align='center' | First | Win | align='left' | Jack Culcay-Keth | align='left' | 11(+)-11 | ||
| align='center' | Second | Win | align='left' |  John Jackson | align='left' | 10-0 | |||
| align='center' | Quarterfinal | Win | align='left' |  Demetrius Andrade | align='left' | 11-9 | |||
| align='center'; bgcolor="#cc9966" | Semifinal | Loss | align='left' | Bakhyt Sarsekbayev | align='left' | 6-10 |