MUJ
| Acronym | Definition |
|---|---|
| MUJ | Mujahideen (military slang) |
| MUJ | Miss Universe Japan (est. 1998; pageant) |
| MUJ | Merged US-Japan (astrophysics) |
| MUJ | Musicians' Union of Japan |
| MUJ | Madras Union of Journalists (India) |
| MUJ | MUFON (Mutual UFO Network) UFO (Unidentified Flying Objects) Journal |
| MUJ | Macromedia Users Journal |