| Acronym | Definition |
|---|
| MWRA | Massachusetts Water Resources Authority |
| MWRA | Married Women of Reproductive Age |
| MWRA | Mid-West Regional Authority (Ireland) |
| MWRA | Morale, Welfare and Recreation Association (District of Columbia National Guard) |
| MWRA | Maryland Wildlife Rehabilitators Association (Pasadena, MD) |
| MWRA | Midwest Whippet Racing Association |
| MWRA | Medical Waste Regulatory Act (Michigan) |
| MWRA | Mississippi Water Resources Association |
| MWRA | Minnesota Working Rottweiler Association |
| MWRA | Maryland Washington Racquetball Association |
| MWRA | Mini-Wedge Racing Association |
| MWRA | Mighty Wonderful Repeater Association (Los Angeles, California amateur radio group) |
| MWRA | Midwest Relocation Alliance |