MRHA
| Acronym | Definition |
|---|---|
| MRHA | Milwaukee Road Historical Association |
| MRHA | Mississippi Regional Housing Authority |
| MRHA | Missouri Rural Health Association |
| MRHA | Michigan Reining Horse Association |
| MRHA | Multiple Resource Host Architecture |
| MRHA | Montana Reining Horse Association |
| MRHA | Massachusetts Rental Housing Association, Inc. |
| MRHA | Mexican Red-Headed Amazon (bird species) |