| Abbreviation | Definition |
|---|---|
| NMUA | North Metro Umpire Association |
| NNK | Nage No Kata |
| NNSL | National Ski League |
| NOAD | North America Outdoor Directory |
| NOB | Nederlandse Onderwatersport Bond |
| NOC | National Olympic Committee of Pakistan |
| NOC | Nigeria Olympic Committee |
| NOCSA | The National Olympic Committee of South Africa |
| NOCSAE | National Operating Committee on Standards for Athletic Equipment |
| NOJ | New Orleans Jazz |
| NOK | None Of a Kind |
| NOLC | New Orleans Lacrosse Club |
| NOLC | Northern Ohio Lancer Club |
| NOLO | NO Losing Options |
| NOML | National On-line Math League |
| NOOD | National Offshore One Design race |
| NOR | Non Organized Racing |
| NORA | Number One Rider Award |
| NORCECA | North, Central America and Caribbean Volleyball Confederation |
| NORDA | New Orleans Racing Drivers Association |