| Abbreviation | Definition |
|---|---|
| MHAC | Miniature Horse Association of Canada |
| MHAC | Minor Hockey Association of Calgary |
| MHAM | Mental Health Association of Maryland |
| MHCA | Maine Health Care Association |
| MHCA | Manitoba Heavy Construction Association |
| MHCA | Minnesota Heating and Cooling Association |
| MHCA | Mississippi Health Care Association's |
| MHCA | Missouri Health Care Association |
| MHCA | Montana Health Care Association |
| MHEA | Materials Handling Engineers Association |
| MHEA | Materials Handling Engineers' Association |
| MHMA | Madras Halai Memon Association |
| MHMA | Mid Hudson Mycological Association |
| MHMA | Midwest Healthcare Marketing Association |
| MHMA | Mobile Homes Manufacturers Association |
| MHOA | Massachusetts Health Officers Association |
| MHOA | Mobile Home Owners Association |
| MHPA | Minnesota Honey Producers Association |
| MHRA | Michigan Hot Rod Association |
| MHRA | Modern Humanities Research Association |