| 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 |