| Abbreviation | Definition |
|---|---|
| NIAT | NASA Integrated Action Team |
| NIB | Non-Interference Basis |
| NIC | Not in Contract |
| NIC | Not In the Contract |
| NiCd | Nickel-Cadmium |
| NIDS | Network Interface Data System |
| NIF | Nascom Interface Facilities |
| NIF | National Ignition Facility |
| NIL | No Limit |
| NIL | No Limit (NL preferred) |
| NIM | Nuclear Instrumentation Module |
| NIP | Network Input Processor |
| NIP | Network Interface Processor |
| NIP | Nipple |
| NIS | Norwegians In Space |
| NI-SIL | Nickel-Silver |
| NISN | NASA Integrated Services Network |
| NITR | NASA Information Technology Requirement |
| NJP | Network Job Processing |
| NL | No Limit |