| Abbreviation | Definition |
|---|---|
| NCAF | New Canaan Athletic Foundation |
| NCCAA | National Christian College Athletic Association |
| NDL | National Disqualified List |
| NDL | NCAA (National Collegiate Athletic Association) Dynasty League |
| NEAC | North Eastern Athletic Conference |
| NFOR | Non-Functional Over-Reaching |
| NIAA | Northwest Intercollegiate Athletic Association |
| NIAC | National Indoor Athletics Centre |
| NIAC | Nebraska-Iowa Athletic Conference |
| NIAC | Northern Indiana Athletic Conference |
| NIAC | Northern Intercollegiate Athletic Conference |
| NIDJAM | National Inter District Junior Athletics Meet |
| NJAC | New Jersey Athletic Conference |
| NKAC | Northern Kentucky Athletic Conference |
| NLA | Next Level Athletics |
| NLAA | Newfoundland and Labrador Athletics Association |
| NOCSAE | National Operating Committe on Standards for Athletic Equipment |
| NOCSAE | National Operating Committee for Standards in Athletic Equipment |
| NOCSAE | National Operating Committee on Standard for Athletic Equipment |
| NOCSAE | National Operating Committee on Standards for Athletic Equipment |