MRWG
| Acronym | Definition |
|---|---|
| MRWG | Milwaukee River Work Group (Wisconsin) |
| MRWG | Marine Reserves Working Group (various agencies) |
| MRWG | Melbourne Romance Writers Guild (est. 1991; Australia) |
| MRWG | Mission Requirements Working Group |
| MRWG | Morgan Run Watershed Group |
| MRWG | Multilateral Refugee Working Group (advocacy group; Jordan and Israel) |