| Abbreviation | Definition |
|---|---|
| MARS | Mini Assault Rifle System |
| MARS | Mobile Assault Rescue And Security |
| MART | Mandatory Abuse Reporting Training |
| MASH | Men As Survivors Helpline |
| MASJ | Master of Arts in Social Justice |
| MASJ | Master of Arts Social Justice |
| MAT | Marijuana Action Team |
| MATA | Massachusetts Academy of Trial Attorneys |
| MATA | Missouri Association of Trial Attorneys |
| MATILDA | Mesa Associates' Tactical Integrated Light-force Deployment Assembly |
| MATL | Missouri Association of Trial Lawyers |
| MAV | Modular Assault Vehicle |
| MAW | Mechanized Assault Warrior |
| MAX | Mechanised Assault And Xploration |
| MB | Metal Bracelet |
| MBA | Malir Bar Association |
| MBA | Matter Billing Attorney |
| MBCC | Montana Board of Crime Control |
| MBF | Michael, Best, & Friedrich, L. L. P. |
| MBF | Mind Blowing Finatic |