| 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) |