| 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) |