MJO
| Acronym | Definition |
|---|---|
| MJO | Madden-Julian Oscillation (weather pattern) |
| MJO | Metropolitan Jazz Orchestra (Denver, CO) |
| MJO | Manhattan Jazz Orchestra (est. 1979) |
| MJO | Märkisches Jugendsinfonieorchester (German: Young Symphony Orchestra of Mark; Altena, Germany) |
| MJO | Mouvement de la Jeunesse Orthodoxe (French: Orthodox Youth Movement) |
| MJO | Master Job Order |