| Abbreviation | Definition |
|---|---|
| MGPA | Malaysian Gifts Premium Association |
| MGPA | Maryland Grain Producers Association |
| MGSA | Modern Greek Studies Association |
| MGVA | Milwaukee Gay Volleyball Association |
| MHA | Montana Hospital Association |
| MHAA | Mendota Heights Athletic Association |
| MHAA | Mental Health Association in Alaska |
| MHAA | Mid Hudson Astronomical Association |
| MHAA | Mid Hudson Astronomy Association |
| MHAA | Miniature Horse Association of Arizona |
| MHAA | Miniature Horse Association of Australia |
| MHAA | Minot Hebron Athletic Association |
| MHAA | Mint Hill Athletic Association |
| MHAA | Monfort Heights Athletic Association |
| MHAA | Monterey History and Art Association |
| MHAA | Mosby Heritage Area Association |
| MHAA | Myanmar Health Assistant Association |
| MHAA | Myanmar Health Assistants Association |
| MHAC | Manufactured Housing Association of Canada |
| MHAC | Mental Health Association in California |