| Abbreviation | Definition |
|---|---|
| N/C | Nose Cone |
| N/C | Not Critical |
| N/C | Numerical Control |
| N/D | Need Date |
| N/O | Normally Open |
| N/P | Not Provided |
| N/W | NetWork |
| N2 | Nitrogen |
| N2H4 | Hydrazine |
| N2HO4 | Nitrogen Peroxide |
| N2O4 | Nitrogen Tetroxide |
| NA | Next Action |
| NA | Not Ascertainable |
| NAAL | North American Aerodynamic Laboratory |
| NAC | Nacelle |
| NACA | National Advisory Committee for Aeronautics |
| NAEC | Naval Air Engineering Center |
| NAFIS | NASA Accounting and Financial Information Center |
| NAI | NASA Astrobiology Institute |
| NAIS | NASA Acquisition Internet Service |