| Acronym | Definition |
|---|
| MHAA➣My Hero Academia Abridged (parody) |
| MHAA➣Mental Health Association in Alaska |
| MHAA➣Mid-Hudson Astronomy Association (New York) |
| MHAA➣Miniature Horse Association of Australia, Inc. (est.1989) |
| MHAA➣Mental Health Act Administrator (National Health Service; UK) |
| MHAA➣Myanmar Health Assistant Association |
| MHAA➣Manhours per Adjusted Admission (healthcare finance) |
| MHAA➣Miniature Horse Association of Arizona |