| 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 |