| Abbreviation | Definition |
|---|---|
| MGMA | Medical Group Management Association |
| MHA | Malaysian Hotel Association |
| MHA | Masonry Heater Association |
| MHA | Men's Hall Association |
| MHA | Michigan Health & Hospital Association |
| MHA | Mining History Association |
| MHAM | Manufactured Housing Association of Maine |
| MHAM | Mental Health Association of Minnesota |
| MHAM | Mental Health Association of Montana |
| MHMRA | Michigan Hotel, Motel, and Resort Association |
| MHPF | Minority Health Professionals Foundation |
| MIA | Malta Institute of Accountants |
| MIA | Marble Institute of America |
| MIAA | Meetings Industry Association of Australia |
| MIAA | Mortgage Industry Association of Australia |
| MIAA | Music and Imagery Association of Australia |
| MIAMA | The Minnesota Ice Arena Managers Association |
| MIAMA | The Minnesota Ice Arena Manager's Association |
| MIBOR | Metropolitan Indianapolis Board Of Realtors |
| MICA | Mortgage Insurance Companies of America |