| Abbreviation | Definition |
|---|---|
| NR | Non-Runner |
| NR | Not Ranked |
| NRA | New River Adventure |
| NRA | Not Really Athletes |
| NRC | National Racing Calendar |
| NRC | National Racquetball Club |
| NRE | Non-Racing Event |
| NRF | Nederlandse Rittensport Federatie |
| NRHA | National Reining Horse Association |
| NRL | National Rugby League |
| NRMFA | Niagara Regional Minor Football Association |
| NRPGI | National Registry of Professional Golf Instructors |
| NRRA | Norwalk River Rowing Association |
| NRRC | North Ridge Racquet Club |
| NRRG | Northeast Ohio Rock'n'Roller Girls |
| NRRS | National Road Racing Series |
| NRW | Neighborhood Ruckus Wrestling |
| NS | North and South |
| NSA | National Softball Assosition |
| NSA | National Swoloball Association |