ONJ
| Acronym | Definition |
|---|---|
| ONJ | Osteonecrosis of the Jaw |
| ONJ | Olivia Newton-John |
| ONJ | Orchestre National de Jazz (France) |
| ONJ | Odate Noshiro Airport (Akita, Japan airport code) |
| ONJ | Olst Nederland Jachtbouw (Olst Netherlands Yachting) |
| ONJ | Observatoire National de la Jeunesse (French; Tunisia) |