| Abbreviation | Definition |
|---|---|
| MWB | Mission Without Borders |
| MWB-NA | Mission Without Borders - North America |
| MWC | Michigan Wildlife Conservancy |
| MWCA | Montana Weed Control Association |
| MWDT | Making Waves Development Trust |
| MWF | Manitoba Wildlife Federation |
| MWF | Montana Wildlife Federation |
| MWFOEC | Manitoba Wildlife Federation Outdoor Education Centre |
| MWHF | Michigan Wildlife Habitat Foundation |
| MWM | Metropolitan Washington Mensa |
| MWQA | Minnesota Water Quality Association |
| MWT | Mashwani Welfare Trust |
| MWUL | Metropolitan Wilmington Urban League |
| MWVGIG | Mid- Willamette Valley Gluten Intolerance Group |
| MWW | Minnesota Waste Wise |
| MYAF | Michigan Young Americans for Freedom |
| MYAP | Multi-Year Assistance Program |
| MYWO | Maendeleo Ya Wanawake Organization |
| NA | Narcotics Anonymous |
| NAA | National Aphasia Association |