| Abbreviation | Definition |
|---|---|
| NSF | National Science Foundation |
| NSIP | National Seafood Inspection Program |
| NSN | National Stock Number |
| NSR | Non-Significant Risk |
| NSRT | Nutrition Science Review Team |
| NSRT(CFSAN) | Nutrition Science Review Team (CFSAN) |
| NST | National Support Team |
| NSV-DO | Nashville, Tennessee, District Office |
| NSV-DO(ORA) | Nashville (Tennessee) District Office (ORA) |
| NSWL | Naval Surface Weapons Laboratory (now FDA White Oak campus) |
| NTA | Notice To Applicants |
| NTB | NeuroToxicology Branch |
| NTB(CFSAN) | Neurotoxicology Branch (CFSAN) |
| NTEU | National Treasury Employees Union |
| NTF | National Turkey Federation |
| NTG | nitroglycerin |
| NTI | Narrow Therapeutic Index |
| NTIA | National Telecommunications and Information Administration |
| NTIS | National Technical Information Service |
| NTL | National Testing Laboratory |