| MRHA | Maintenance of Religious Harmony Act 
| Others |
| MRHA | Maryland Rural Health Association
| Others |
| MRHA | Massachusetts Rental Housing Association
| Others |
| MRHA | Medicines and Healthcare Products Regulatory Authority
| Others |
| MRHA | Metropolitan Regional Housing Authority
| Others |
| MRHA | Michigan Retail Hardware Association
| Others |
| MRHA | Midwest Ranch Horse Association
| Others |
| MRHA | Milwaukee Road Historical Association
| Others |
| MRHA | Mississippi Rural Health Association
| Others |
| MRHA | Missouri Reining Horse Association
| Others |
| MRHA | Missouri Rural Health Association
| Others |
| MRHA | Montana Reining Horse Association
| Others |
| MRHA | Montana Rural Health Association
| Others |