| Abbreviation | Definition |
|---|---|
| NSIS | Next Step In Signaling |
| NSL | National Security Letters |
| NSL | Non-Stockage List |
| NSL | No-Strike List |
| NSLC | Naval Sea Logistics Center |
| NSLCDET | Naval Sea Logistics Center Detachment |
| NSM | National Search and Rescue (SAR) Manual |
| NSM | National Secure Mode |
| NSM | Naval Surface Missile |
| NSMS | National Strategy For Maritime Security |
| NSNF | Nonstrategic Nuclear Forces |
| NSNMDR | National Stock Number Master Data Record |
| NSNMDR | NSN Master Data Record |
| NSO | Non-Single Integrated Operational Plan (SIOP) Option |
| NSOC | National Security Operations Center |
| NSOC | National SIGINT Operations Center |
| NSOC | National Signals Intelligence (SIGINT) Operations Center |
| NSOC | Navy Satellite Operations Center |
| NSOOC | North Atlantic Treaty Organization (NATO) Staff Officer Orientation Course |
| NSP | National Safety Precautions |