| Abbreviation | Definition |
|---|---|
| NRPA | Narrow River Preservation Association |
| NRPA | National Recreation and Park Association |
| NRPA | Natural Resources Protective Association |
| NRR | Navesink River Rowing |
| NRRA | National Risk Retention Association |
| NRRF | National Rehabilitation & Rediscovery Foundation |
| NRRF | National Right to Read Foundation |
| NRRP | Natural Resources and Rights Program (Rainforest Alliance) |
| NRRW | National Registry for Radiation Workers |
| NRSF | National Reye's Syndrome Foundation |
| NRSFI | National Reye's Syndrome Foundation, Inc. |
| NRT | Natural Resources Trust of Easton |
| NRTC | National Resource and Training Center |
| NRTS | Non-profit Resource Training Series |
| NS | NatureServe |
| NSA | National Stroke Association |
| NSA | Night Stalker Association |
| NSAA | National Speakers Association of Australia |
| NSAH | National Sexual Assault Hotline |
| NSB | National Speakers Bureau |