| Acronym | Definition |
|---|
| MMRG➣Moose Mountains Regional Greenways (New Hampshire) |
| MMRG➣Mid Michigan Radio Group (radio stations; Holt, MI) |
| MMRG➣Marine Mammal Research Group (Macquarie University; Australia) |
| MMRG➣Maryland Mapping Resource Guide |
| MMRG➣Mickleover Model Railway Group (UK) |