| Abbreviation | Definition |
|---|---|
| NRBU | New River Bicycle Union |
| NRFU | Northland Rugby Football Union |
| NRPA | Niagara Region Police Association |
| NRSU | Nepal Revolutionary Students Union |
| NRSU | Nepal Revolutionary Students' Union |
| NRSU | Northern Raphei Students Union |
| NSDU | National Self Determination Union |
| NSDU | National Society Daughters of the Union |
| NSIU | National Security Industry Union |
| NSPU | National Savers and Pensioners Union |
| NSPU | North Sumatra Peasants Union |
| NSTU | Nova Scotia Teachers' Union (Canada) |
| NSU | National Supporters Union |
| NSU | Nikkei Student Union |
| NSUD | Naga Students Union Delhi |
| NSUI | National Students' Union of India |
| NSWTF | New South Wales Teachers' Federation (Australia) |
| NSWU | National Security Workers Union |
| NSWU | National Security Workers Union, UK |
| NSWU | National Series Winners Union |