| Abbreviation | Definition |
|---|---|
| NAC | North America Challenge |
| NACRA | North American Catamaran Racing Association |
| NADU | North Arkansas Down Under |
| NAFA | National Amateur Football Association |
| NAFA | North American Flyball Association |
| NAFL | North American Football League |
| NAFL | Northern Amateur Football League |
| NAG | National Air Racing Group |
| NAHD | NA Hussein Dey |
| NAHL | North American Hockey League |
| NAIA | National Association of Intercollegiate Athletics |
| NAL | New Athletic Life |
| NALB | Nebraska American Legion Baseball |
| NALC | North American Laser Class |
| NAMBLA | North American Motorcycle Bandana Loving Association |
| NAN | North American Nationals |
| NAP | National Alliance of Powerlifters |
| NAP | North American Pairs |
| NAPFA | National Physical Fitness Award |
| NAPFS | National Association for the Promotion of Female Sports |