| Acronym | Definition |
|---|
| MJCA | Ministry of Justice and Constitutional Affairs |
| MJCA | Mount Juliet Christian Academy (Mt Juliet, TN) |
| MJCA | MJ Carter Associates (UK) |
| MJCA | Missouri Junior Cattlemen's Association |
| MJCA | Maison Jeune Culture Abyme |
| MJCA | Micro Jet Cooling Array |
| MJCA | Memphis Jackson Cricket Association |
| MJCA | Melton Junior Cricket Association |
| MJCA | Michael J Camlinde and Associates (Oklahoma City, OK) |
| MJCA | Moose Jaw Construction Association |
| MJCA | Modular Joint Capacity Allocation |
| MJCA | Ministry of Justice and Customs of Australia |