| Abbreviation | Definition |
|---|---|
| MRIA | Mongolian Renewables Industries Association |
| MRIA | Mount Royal Improvement Association |
| MRLA | Montana Repeater Link Association |
| MRMA | Malaysian REIT Managers Association |
| MRMA | Marshall Retail Management Association |
| MRMA | Midlands Retired Military Association |
| MRMA | Miramichi Regional Multicultural Association |
| MRNA | Mad River Neighborhood Association |
| MRPA | Maryland Recreation and Parks Association |
| MRPA | Maryland Resource Parent Association |
| MRPA | Michigan Rifle and Pistol Association |
| MRPA | Michigan Rifle Pistol Association |
| MRPA | Michigan Road Preservation Association |
| MRPA | Mt Ralston Properties Association |
| MRWA | Maine Rural Water Association |
| MRWA | Maryland Rural Water Association |
| MRWA | Michigan Rural Water Association |
| MRWA | Minnesota Rural Water Association |
| MRWA | Missouri Rural Water Association |
| MRWA | Montour Run Watershed Association |