| Abbreviation | Definition |
|---|---|
| NAAF | National Amateur Athletic Federation |
| NABL | National Athletic Basketball League |
| NAC | Northern Athletics Conference |
| NACB | Northern Athletic Centre Board |
| NACC | Northern Athletics Collegiate Conference |
| NACE | National Athletic Collegiate Employers |
| NACWAA | National Association of Collegiate Women Athletics |
| NAF | national athletic federation |
| NAF | Non Athletic F*** |
| NAIA | National Association of Intercollegiate Athletics |
| NAIA | National Association of Interscholastic Athletics |
| NAIG | North American Indigenous Games |
| NAL | New Athletic Life |
| NAOA | Northern Athletics Officials Association |
| NARP | Non Athletic Regular People |
| NASCAR | Non Athletic Sport Centered Around Rednecks |
| NASCAR | Non Athletic Sport Composed of Amused Redneck |
| NASCAR | Non Athletic Sport Created Around Rating |
| NASCAR | Non Athletic Sports Cars And Rednecks |
| NATA | National Athletic Trainers' |