| Abbreviation | Definition |
|---|---|
| NOCSAE | National Operating Committee on Standards in Athletic Equipment |
| NRAC | North Rockhampton Athletics Centre |
| NSAA | North Smithfield Athletic Association |
| NSAA | North Smithfield Athletics Association |
| NSAA | North Star Athletic Association |
| NSI | Newport, Sammamish, Interlake, |
| NSIA | National Study of Intercollegiate Athletics |
| NUALA | Natural Universal Athletic Limitless Authentic |
| NVA | New Vision Athletics |
| NVAA | Northern Valley Athletic Association |
| NYA | Nashville Youth Athletics |
| NYAA | Northridge Youth Athletic Association |
| NYAA | Northwestern Youth Athletic Association |
| NYAC | New York Athletic Club |
| NYSFSSAA | New York State Federation of Secondary School Athletic Associations |
| NYSPHSAA | New York State Public High School Athletic Association |
| NZMA | New Zealand Masters Athletics |
| OAA | Oakdale Athletic Association |
| OAC | Ohio Athletic Committee |
| OAC | Ohio Athletic Conference |