| Abbreviation | Definition |
|---|---|
| NOR | Northrup Flight Strip, New Mexico (Deorbit option site) |
| NOR | Number of Optional Referendums |
| NORAD | North American Air Defense Command |
| NORDSAT | Scandinavian Countries Broadcast Satellite |
| NOSA | Nasa Open |
| NOSL | Night/day Optical Survey of thunderstorm Lightning |
| NOSP | Network Operations Support Plan |
| NOSS | National Oceanic Survey Satellite |
| NOVA | NASA Opportunities for Visionary Academics |
| NOZ | Nozzle |
| NP | Near Pass |
| Np | Neptunium |
| NP | Network Program |
| NP | Not Provided |
| NPC | NASA Publication Control |
| NPC | Nitrogen Purge Control |
| NPC | Normal Plane Change maneuver |
| NPD | NASA Policy Directive |
| NPD | Nominal Percent Defective |
| NPDS | Nuclear Particle Detection Subsystem |