MJA
| Acronym | Definition |
|---|---|
| MJA | Medical Journal of Australia |
| MJA | Methanococcus Jannaschii |
| MJA | Maatschappelijke Jongeren Actie (Dutch: Social Youth Action; Brussels, Belgium) |
| MJA | Master of Justice Administration (Methodist University and Norwich University) |
| MJA | Marsden Jacob Associates (Australia) |
| MJA | Modern Jesus Army |
| MJA | Microjet Array |