| Abbreviation | Definition |
|---|---|
| NTDR | North Texas Derby Revolution |
| NTFL | Northern Territory Football League |
| NTKT | North Texas Kayak Trail |
| NTL | Not Tournament Legal |
| NTR | New Track Record |
| NTS | Neidhardt Training Stables |
| NTS | No Team Sheet |
| NTSA | National Target Shooting Association |
| NTSA | Northeast Tennessee Sports Association |
| NTT | Nebraska Tractor Test |
| NUAC | Northern Underground Adrenaline Circuit |
| NUFC | Newcastle United Football Club |
| NUKF | National Union of Karate-Do Federation |
| NUL | Northern Utah League |
| NUMB | Nebraska United Methodist Bike |
| NURP | National Union Of Racing Pigeons |
| NUSC | Northwest United Soccer Club |
| NVA | National Volleyball Association |
| NVC | Newport Volleyball Club |
| NVL | Northville Volleyball League |