| Abbreviation | Definition |
|---|---|
| NFL | Nobody's Freaking Loyal |
| NFS | Not For Sale |
| NFSU | Need For Speed Underground |
| NFSU2 | Need For Speed Underground 2 |
| NG | N Gage |
| NGA | National Gardening Association |
| NGC | Nintendo GameCube |
| NHOC | New Hampshire Outing Club |
| NHRDA | National Hot Rod Diesel Association |
| NI | New Issue |
| NIB | New In Box |
| NIB | Not In Box |
| Nil | a brand of cigarette |
| NIRA | Northern Illinois Rocketry Association |
| NJAG | North Jersey Astronomical Group |
| NJBA | New Jersey Bass Anglers |
| NJBA | North Jersey Bridge Association |
| NKCA | National Knife Collectors Association |
| N-KCHS/gc | Nobleton-King City Horticultural Society/garden club |
| NKG | Northern Kite Group |