List of Government Acronyms: M
| Acronym | Agency/Organization/Definition |
| Marecs | Maritime European Communications Satellite |
| MARVEL | Machine Assisted Realization of the Virtual Electronic Library (LOC) |
| MBDA | Minority Business Development Agency |
| MDA | Missle Defense Agency |
| MERCOSUR | Mercado Comun del Cono Sur; see Southern Cone Common Market |
| MICAH | International Civilian Support Mission in Haiti |
| MIGA | Multilateral Investment Geographic Agency |
| MINUSTAH | United Nations Stabilization Mission in Haiti |
| MINURSO | United Nations Mission for the Referendum in Western Sahara |
| MMWR | Morbidity and Mortality Weekly Report |
| MOLIS | Minority Online Information Service |
| MONUC | United Nations Organization Mission in the Democratic Republic of the Congo |
| MSDS | Material Safety Data Sheets |
| MTCR | Missile Technology Control Regime |
| MSA | Metropolitan Statistical Area |
