| Acronym | Definition |
|---|
| MSJ | Mount St. Joseph (various locations) |
| MSJ | Movement for Social Justice (various organizations) |
| MSJ | Magnetics Society of Japan |
| MSJ | Microsoft Systems Journal |
| MSJ | Medill School of Journalism (Northwestern University; Illinois) |
| MSJ | Misawa, Japan (Airport Code) |
| MSJ | Motion for Summary Judgment (civil procedure legal practice) |
| MSJ | Mycological Society of Japan (est. 1956) |
| MSJ | Minimum Security Jail (Ohio) |
| MSJ | Meteorological Society of Japan |
| MSJ | Multiple Selective Reject |
| MSJ | Mac Serial Junkie (web repository of Mac software registration data) |
| MSJ | Master of Science in Jurisprudence (degree program) |
| MSJ | Medical Sisters of Saint Joseph |
| MSJ | Master of Social Justice (Woodbury University; Burbank, CA) |