| Acronym | Definition |
|---|
| MRRA | Midcoast Regional Redevelopment Authority (Brunswick, ME) |
| MRRA | Maine Resource Recovery Association |
| MRRA | Military Retirement Reform Act (USA) |
| MRRA | Migration and Refugee Assistance Act of 1962 |
| MRRA | Minnesota Rifle and Revolver Association |
| MRRA | Magnetic Resonance Radiologists Association |
| MRRA | Minnesota Resource Recovery Association |
| MRRA | Meramec River Recreation Association (Missouri) |
| MRRA | Moose River Recreation Area |
| MRRA | Merrimac River Rowing Association (Massachusetts) |
| MRRA | Magnetic Resonance Research Accessories (est. 2009) |
| MRRA | Maclear Ratepayers' and Residents' Association (South Africa) |
| MRRA | Military Retirement Reduction Act |
| MRRA | Mechanically Reconfigurable Reflector Antenna |
| MRRA | Minnesota Road Race Academy |
| MRRA | Municipal Rehabilitation and Recovery Act (Camden, New Jersey) |
| MRRA | Maylands Ratepayers and Residents Association (Australia) |
| MRRA | Management Reserve Right of Admission |