| Abbreviation | Definition |
|---|---|
| NKG | Northerners Kick Grass |
| NM | National Master |
| NM | Near Mint |
| NML | Native Muzzle Loader |
| NMOL | No More Ordinary Lifestyle |
| NMOS | New Mexico Ornithological Society |
| NMRA | National Model Railroad Association |
| NMSL | Nursing Mothers Sewing List |
| NOHVA | Nebraska Off Highway Vehicle Association |
| NOMG | North Otago Motor Group |
| NOQ | National Online Quilters |
| NPA | National Pigeon Associarion |
| NPAA | National Professional Anglers Association |
| NPK | Norsk Peugeot Klubb |
| NPPA | Nebraska Power Pullers Association |
| NRC | National Rover Council |
| NRMA | National Roads Motorists Association |
| NROA | Northwood RV Owners Association |
| NRR | No Rules Riders |
| NRRC | North Roanoke Recreation Club |