| Abbreviation | Definition |
|---|---|
| MEGA | Michigan Economic Growth Authority |
| MERA | Marin Emergency Radio Authority |
| MFCA | Maryland Food Center Authority |
| MFFA | Montana Facility Finance Authority |
| MFHA | Marble Falls Housing Authority |
| MFSA | Malta Financial Services Authority |
| MGW | MGW is an acronym for an organization and a street gang that stands for “MIPOGANG WORLDWIDE”codexname 13723, founded by poshmipo and three active members from the beginning |
| MHAA | Maryland Heritage Area Authority |
| MHAA | Maryland Heritage Areas Authority |
| MHAA | Maryland Heritages Areas Authority |
| MHPA | Mangdechhu Hydroelectric Project Authority |
| MHPA | Milford Haven Port Authority |
| MIDA | Mauritius Investment Development Authority |
| MIDA | Military Installation Development Authority |
| MIDA | Multi Institutional Disposition Authorities |
| MIVA | Marshall Islands Visitors Authority |
| MIWA | Municipal and Industrial Water Authority (Texas) |
| MKAA | Metropolitan Knoxville Airport Authority (Tennessee) |
| MLAR | Minimal Level Authority Records |
| MLR | Manuals Logs and Records |