2012 Zomer Olympische Spelen - Atleten
| Atleet | Sport |
|---|---|
 Carmelita Jeter | Athletiek |
 Olivera Jevtic | Athletiek |
| Marko Jevtovic | Tafeltennis |
 Jaromir Jezek | Judo |
| Stanislav Jezek | Canoe/Kayak |
 Andrzej Jezierski | Canoe/Kayak |
 Park Ji Ho | Aquatics |
| Kim Ji-Hoon | Gymnastiek |
| Lim Ji-Hye | Gewichtheffen |
| Jung Ji-Hyun | Worstelen |
| Sung Ji-Hyun | Badminton |
| Kim Ji-Yeon | Schermen |
 Liang Jiahong | Athletiek |
| Wang Jiali | Athletiek |
| Shi Jian | Zeilen |
| Zhang Jian | Schieten |
| Tan Jian | Athletiek |
| He Jianbin | Aquatics |
| Li Jianbo | Athletiek |
| Ma Jianfei | Schermen |
 Huajun Jiang | Tafeltennis |
| Tianyi Jiang | Tafeltennis |
| Sheng Jiang | Worstelen |
| Zhao Jianguo | Athletiek |
| Wang Jiao | Worstelen |