2012 Zomer Olympische Spelen - Atleten
| Atleet | Sport |
|---|---|
 Peter Joppich | Schermen |
 Zane Jordan | Aquatics |
 Gwen Jorgensen | Triatlon |
 Moise Joseph | Athletiek |
 Anthony Joshua | Boksen |
 Ahed Jouhili | Gewichtheffen |
 Rim Jouini | Boksen |
| Baean Jouma | Aquatics |
 Sébastien Jouve | Canoe/Kayak |
 Bojan Jovanovic | Schermen |
| Sanja Jovanovic | Aquatics |
 Jordan Jovtchev | Gymnastiek |
| Kara Lynn Joyce | Aquatics |
 Jan Jørgensen | Badminton |
| Morten Jørgensen | Roeien |
 Vanda Juhasz | Athletiek |
 Dinko Jukic | Aquatics |
 Arsen Julfalakyan | Worstelen |
 Juliana | Volleybal |
| Ronald Julião | Athletiek |
| Jeffrey Julmis | Athletiek |
 Zhu Jun | Schermen |
| Li Jun | Schieten |
| Dai Jun | Aquatics |
| Zhang Jun | Athletiek |