| Acronym | Meaning |
 | NAVAID | Navigation Aid |
| NAVSTAR | NAVigation Signal Timing And Ranging System |
| NAWAU | National Aviation Weather Advisory Unit |
| NAWPG | National Aviation Weather Products Generator |
| NBDRC | New Building Design Review Committee |
| NBS | National Bureau Of Standards |
| NCAB | Network Coordination And Advisory Board |
| NCAR | N/A |
| NCAR | National Center For Atmospheric Research |
| NCAR/UCAR | National Center For Atmospheric Research |
| NCC | National Climate Center |
| NCDC | National Climatic Data Center |
| NCDS | NASA Climate Data System |
| NCEP | National Centers For Environmental Prediction |
| NCF | Network Control Facility |
| NCGIA | National Center For Geographic Information And Analysis |
| NCHPC | National Consortium For High Performance Computing |
| NCIS | Nadir Climate Interferometer Spectrometer |
| NCMC | Non-Classical Mesoscale Circulations |
| NCMRWF | India's National Centre For Medium Range Weather Forecasting |
| NCOM | NCAR CSM Ocean Model |
| NCP | Network Control Program |
| NCPO | National Climate Project Office |
| NCRP | National Council On Radiation Protection And Measurement |
| NCSA | National Center For Supercomputing Applications |
| NCSNET | NASCOM Custom Subnetwork |
| NCTM | National Council Of Teachers Of Mathematics |
| ND | Near-dedicated |
| NDARB | North Dakota Atmospheric Resources Board |
| NDBC | National (or NOAA) Data Buoy Center |
| NDC | National Data Center |
| NDSC | Network For Detection Of Stratospheric Change |
| NDT | Non-destructive Testing |
| NDTE | North Dakota Tracer Experiment |
| NDTP | North Dakota Thunderstorm Project |
| NDVI | Normalized Difference Vegetation Index |
| NDVI | Greeness Index From Satellites |
| NEAQS | New England Air Quality Study |
| NEC | Norman (Oklahoma) Evaluation Committees |
| NEC | Nippon Machines |
| NECHE | Northeast Colorado Hail Experiment |
| NEDRES | National Environmental Data Referral System |
| NEEDS | N/A |
| NEHRP | National Earthquake Hazard Reduction Program |
| NEIC | National Earthquake Information Center |
| NEM | NWP Explicit Microphysics |
| NEMS | Nimbus E Microwave Spectrometer |
| NENA | NOAA's Northeast-North Atlantic 2004 |
| NEONS | Navy Environmental Operational Nowcast System |
| NEPA | National Environmental Policy Act |
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