| 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) |