| Abbreviation | Definition |
|---|---|
| NPS(CFSAN) | Nutrition Programs Staff (CFSAN) |
| NPSB | Nutritional Product Studies Branch |
| NPSB(CFSAN) | Nutritional Product Studies Branch (CFSAN) |
| NR | Non-compliance Record |
| NR | Response to 'Not approvable' letter |
| NRB | Non-institutional Review Board |
| NRC | Nuclear Regulatory Commission |
| NRCC | National Response Coordination Center |
| NREVSS | National Respiratory and Enteric Virus Surveillance System |
| NRP | National Response Plan (Department of Homeland Security) |
| NRP-CIS | National Response Plan Catastrophic Incident Supplement |
| NRSP | National Research Support Project |
| NRTE | Not Ready-To-Eat |
| NS | Not Significant |
| NS/EP | National Security and Emergency Preparedness |
| NSA | No Significant Abnormalities |
| NSABPB | National Surgical Adjuvant Breast and Bowel Project |
| NSAPB | National Surgical Adjuvant Breast and Bowel Project |
| NSAPE | North American Society for Pacing and Electrophysiology |
| NSE | Not Substantially Equivalent |