| Abbreviation | Definition |
|---|---|
| MUGZ | Mississippi Unquenchable Grail Zymurgists |
| MURC | Mid US (United States) Robotics Club |
| MVEF | Moreno Valley Electric Flyers |
| MW | Mech Warrior |
| MWC | Model Warship Combat, Inc. |
| MWF | Midwest Fords Car Club |
| MWOTRC | Metro Washington Old Time Radio Club |
| MWSEP | MidWest Society of Erotic Photography |
| M-WTCA | Mid-West Tool Collectors Association |
| N | New |
| NABA | North American Bullriding Association |
| NACC | National Auto Cycle Club |
| NACK | Network of Anyone Collecting Keychains |
| NADDA | National Antique Doll Dealers Association |
| NAHBS | North American Handmade Bicycle Show |
| NAPRA | National Association of Professional River Anglers |
| NAR | National Association of Rocketry |
| NARA | North American Ring Association |
| NARB | National Association of Record Breakers |
| NASDC | National Association of Square Dance Campers |