| Acronym | Meaning |
 | NETWORK | ProNetwork Program |
| NF | NNF Natural Flood |
| NFCS | NNFCSNuclear Forces Communications Satellite |
| NFPA | NNFPANational Fire Protection Association |
| NFS | NNFS Nozzle Flow Sensor |
| NFSP | NNFSPNonflight Switch Panel |
| NFW | NNFW Nonfuel Wasting |
| NG | NNG Narrow Gage |
| NGM | NNGM Nitrogen Generation Module |
| NGT | NASA Ground Terminal |
| NH | NNH Nominal Heig4t (Adjust Maneuver) |
| NH3 | ANH3 Ammonia |
| NH3 | Ammonia |
| NH4 | HNH4 Hydrazine |
| NHA | NNHA Next Higher Assembly |
| NHB | NNHB NASA Handbook |
| NHC | NNHC National Hurricane Center |
| NI | NNi Nickel |
| NI-SIL | NNI-SILNickel-Silver |
| NIA | NNIA NOVA Interface Adapter |
| NIB | NNIB Noninterference Basis |
| NIC | NNIC Not In Contract |
| NICD | NNICDNickel Cadmium |
| NIDS | NNIDSNetwork Interface Data System |
| NIL | NNIL No Limit (NL Preferred) |
| NIM | NNIM Nuclear Instrumentation Module |
| NIP | NNIP Network Input Processor |
| NITROGEN | GNitrogen Gage |
| NITROGEN | PNitrogen Purge Control |
| NJP | NNJP Network Job Processing |
| NL | NNL No Limit |
| NLA | NNLA Npxt Lower Assembly |
| NLG | Nose Landing Gear |
| NLG | Nose Landing Gear |
| NLT | Not Later Than |
| NLT | Not Less Than |
| NM | Nanometer |
| NM | Nautical Miles |
| NM | Network Manager (GSFC) |
| NM | Nonmetallic |
| NMAB | National Materials Advisory Board |
| NMC | National Meteorological Center |
| NMI | NASA Management Instruction |
| NMI | Nautical Mile |
| NMI | Nautical Miles |
| NMO | Normal Manual Operation |
| NMR | Nuclear Magnetic Resonance |
| NMT | Not More Than |
| NMT | Notification Of Master Tool |
| NMV | Nitrogen Manual Valve |
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