MTHA
| Acronym | Definition |
|---|---|
| MTHA | Metropolitan Toronto Housing Authority (Canada) |
| MTHA | Merthyr Tydfil Housing Association (UK) |
| MTHA | Manitoba Transit Heritage Association (est. 1990; Canada) |
| MTHA | Massachusetts Treasure Hunting Association (est. 1981) |
| MTHA | Maryland Thoroughbred Horsemen's Association, Inc. |
| MTHA | Mackinaw Trail Health Associates (Cadillac, MI) |