| Abbreviation | Definition |
|---|---|
| NS | Not Sure |
| NS | Not Switchable |
| NS | Nuclear Shuttle |
| NSA | National Standards Association |
| NSD | NASA standard detonator |
| NSD | Not Sufficient Data |
| NSDP | Nascom System Development Plan |
| NSE | Network Support Engineer |
| NSGT | NASA Ground Terminal |
| NSGT | NASA Standard Ground Terminal |
| NSI | NASA Science Internet |
| NSI-I | NASA Standard Initiator-type I |
| NSI-I | NASA Standard Initiator-Type I (was SMSI) |
| NSLD | NASA Shuttle Logistics Depot |
| NSO | NASA Support Operation |
| NSO | National Solar Observatory |
| NSP | NASA Support Plan |
| NSP | Network Signal Processor |
| NSR | National Slow Rate |
| NSR | Nominal Slow Rate |