| N-AWIPS | National Centers Advanced Weather Interactive Processing Systems | - | Business and Finance |
| N-AWIPS | National Centers Advanced Weather Interactive Processing Systems | - | Business and Finance |
| N-ROSS | Naval Remote Ocean Sensing System | - | Business and Finance |
| N-ROSS | Naval Research Oceanographic Satellite System | - | Business and Finance |
| N-SCAT | NASA Scatterometer | - | Business and Finance |
| N/A OR NA | Not Applicable | - | Business and Finance |
| NAC | NCAR Administrators Committee | - | Business and Finance |
| NACCAM | National Coordinating Committee On Aviation Meteorology | - | Business and Finance |
| NACOA | National Advisory Committee On Oceans And Atmosphere | - | Business and Finance |
| NADO | New Airport Development Office | - | Business and Finance |
| NAE | National Aeronautical Establishment | - | Business and Finance |
| NAE | National Academy Of Engineering | - | Business and Finance |
| NAFAX | Analog Facsimile Map | - | Business and Finance |
| NAFTA | North American Free Trade Agreement | - | Business and Finance |
| NAG | Numerical Algorithms Group Inc. | - | Business and Finance |
| NAIC | National Astronomy And Ionosphere Center | - | Business and Finance |
| NAILS | NCAR Airborne Infrared Lidar System | - | Business and Finance |
| NAO | North American Oscillation | - | Business and Finance |
| NAO | North Atlantic Oscillation | - | Business and Finance |
| NAO | North Atlantic Ocean | - | Business and Finance |
| NAOPS | North Atlantic Ocean Prediction Systems | - | Business and Finance |
| NAOS | North American Observing System | - | Business and Finance |
| NAPAP | National Acid Precipitation Assessment Program | - | Business and Finance |
| NAPP | National Aerial Photography Program | - | Business and Finance |
| NAR | Nonadvocacy Review | - | Business and Finance |
| NARA | U.S. National Archives And Records Administration | - | Business and Finance |
| NARE | North Atlantic Regional Experiment | - | Business and Finance |
| NAS | National Academy Of Sciences | - | Business and Finance |
| NAS | National Airspace System | - | Business and Finance |
| NAS | Naval Air Station | - | Business and Finance |
| NASA | National Aeronautics And Space Administration | - | Business and Finance |
| NASAO | National Association Of State Aeronautics And Organizations | - | Business and Finance |
| NASCAS | NAS Committee On Atmospheric Sciences | - | Business and Finance |
| NASCO | NAS Committee On Oceanography | - | Business and Finance |
| NASCOM | NASA Communications Network | - | Business and Finance |
| NASCOM II | Upgraded Version Of NASA Communications Network | - | Business and Finance |
| NASDA | National Space Development Agency | - | Business and Finance |
| NASN | National Air Surveillance Network | - | Business and Finance |
| NASN | NASN Cascade Impacter In Aerosol Studies | - | Business and Finance |
| NASW | National Association Of Science Writers | - | Business and Finance |
| NAT | Nitric Acid Trihydrate | - | Business and Finance |
| NATCA | National Air Traffic Control Administration | - | Business and Finance |
| NATO | North Atlantic Treaty Organization | - | Business and Finance |
| NATS | NCAR Aircraft (or Airborne) Telemetry System | - | Business and Finance |
| NAUG | NASCOM Augmentation | - | Business and Finance |
| NAVAID | Navigation Aid | - | Business and Finance |
| NAVSTAR | NAVigation Signal Timing And Ranging System | - | Business and Finance |
| NAWAU | National Aviation Weather Advisory Unit | - | Business and Finance |
| NAWPG | National Aviation Weather Products Generator | - | Business and Finance |
| NBDRC | New Building Design Review Committee | - | Business and Finance |
| NBS | National Bureau Of Standards | - | Business and Finance |
| NCAB | Network Coordination And Advisory Board | - | Business and Finance |
| NCAR | N/A | - | Business and Finance |
| NCAR | National Center For Atmospheric Research | - | Business and Finance |
| NCAR/UCAR | National Center For Atmospheric Research | - | Business and Finance |
| NCC | National Climate Center | - | Business and Finance |
| NCDC | National Climatic Data Center | - | Business and Finance |
| NCDS | NASA Climate Data System | - | Business and Finance |
| NCEP | National Centers For Environmental Prediction | - | Business and Finance |
| NCF | Network Control Facility | - | Business and Finance |
| NCGIA | National Center For Geographic Information And Analysis | - | Business and Finance |
| NCHPC | National Consortium For High Performance Computing | - | Business and Finance |
| NCIS | Nadir Climate Interferometer Spectrometer | - | Business and Finance |
| NCMC | Non-Classical Mesoscale Circulations | - | Business and Finance |
| NCMRWF | India's National Centre For Medium Range Weather Forecasting | - | Business and Finance |
| NCOM | NCAR CSM Ocean Model | - | Business and Finance |
| NCP | Network Control Program | - | Business and Finance |
| NCPO | National Climate Project Office | - | Business and Finance |
| NCRP | National Council On Radiation Protection And Measurement | - | Business and Finance |
| NCSA | National Center For Supercomputing Applications | - | Business and Finance |
| NCSNET | NASCOM Custom Subnetwork | - | Business and Finance |
| NCTM | National Council Of Teachers Of Mathematics | - | Business and Finance |
| ND | Near-dedicated | - | Business and Finance |
| NDARB | North Dakota Atmospheric Resources Board | - | Business and Finance |
| NDBC | National (or NOAA) Data Buoy Center | - | Business and Finance |
| NDC | National Data Center | - | Business and Finance |
| NDSC | Network For Detection Of Stratospheric Change | - | Business and Finance |
| NDT | Non-destructive Testing | - | Business and Finance |
| NDTE | North Dakota Tracer Experiment | - | Business and Finance |
| NDTP | North Dakota Thunderstorm Project | - | Business and Finance |
| NDVI | Normalized Difference Vegetation Index | - | Business and Finance |
| NDVI | Greeness Index From Satellites | - | Business and Finance |
| NEAQS | New England Air Quality Study | - | Business and Finance |
| NEC | Norman (Oklahoma) Evaluation Committees | - | Business and Finance |
| NEC | Nippon Machines | - | Business and Finance |
| NECHE | Northeast Colorado Hail Experiment | - | Business and Finance |
| NEDRES | National Environmental Data Referral System | - | Business and Finance |
| NEEDS | N/A | - | Business and Finance |
| NEHRP | National Earthquake Hazard Reduction Program | - | Business and Finance |
| NEIC | National Earthquake Information Center | - | Business and Finance |
| NEM | NWP Explicit Microphysics | - | Business and Finance |
| NEMS | Nimbus E Microwave Spectrometer | - | Business and Finance |
| NENA | NOAA's Northeast-North Atlantic 2004 | - | Business and Finance |
| NEONS | Navy Environmental Operational Nowcast System | - | Business and Finance |
| NEPA | National Environmental Policy Act | - | Business and Finance |
| NEPH | Nephelometer | - | Business and Finance |
| NEPRF | Naval Environmental Prediction Research Facility | - | Business and Finance |
| NERC | National Environment Research Council | - | Business and Finance |
| NESC | National Environmental Satellite Center | - | Business and Finance |
| NESC | National Energy Software Corporation | - | Business and Finance |
