| Acronym | Meaning |
 | MW | Megawords |
| MWG | Meteorological Working Group |
| MWISP | Mt. Washington Winter Icing And Storms Project |
| MWO | Mt. Washington Observatory |
| MWP | MicroWave Profiler |
| N-AWIPS | National Centers Advanced Weather Interactive Processing Systems |
| N-AWIPS | National Centers Advanced Weather Interactive Processing Systems |
| N-ROSS | Naval Remote Ocean Sensing System |
| N-ROSS | Naval Research Oceanographic Satellite System |
| N-SCAT | NASA Scatterometer |
| N/A OR NA | Not Applicable |
| NAC | NCAR Administrators Committee |
| NACCAM | National Coordinating Committee On Aviation Meteorology |
| NACOA | National Advisory Committee On Oceans And Atmosphere |
| NADO | New Airport Development Office |
| NAE | National Aeronautical Establishment |
| NAE | National Academy Of Engineering |
| NAFAX | Analog Facsimile Map |
| NAFTA | North American Free Trade Agreement |
| NAG | Numerical Algorithms Group Inc. |
| NAIC | National Astronomy And Ionosphere Center |
| NAILS | NCAR Airborne Infrared Lidar System |
| NAO | North American Oscillation |
| NAO | North Atlantic Oscillation |
| NAO | North Atlantic Ocean |
| NAOPS | North Atlantic Ocean Prediction Systems |
| NAOS | North American Observing System |
| NAPAP | National Acid Precipitation Assessment Program |
| NAPP | National Aerial Photography Program |
| NAR | Nonadvocacy Review |
| NARA | U.S. National Archives And Records Administration |
| NARE | North Atlantic Regional Experiment |
| NAS | National Academy Of Sciences |
| NAS | National Airspace System |
| NAS | Naval Air Station |
| NASA | National Aeronautics And Space Administration |
| NASAO | National Association Of State Aeronautics And Organizations |
| NASCAS | NAS Committee On Atmospheric Sciences |
| NASCO | NAS Committee On Oceanography |
| NASCOM | NASA Communications Network |
| NASCOM II | Upgraded Version Of NASA Communications Network |
| NASDA | National Space Development Agency |
| NASN | National Air Surveillance Network |
| NASN | NASN Cascade Impacter In Aerosol Studies |
| NASW | National Association Of Science Writers |
| NAT | Nitric Acid Trihydrate |
| NATCA | National Air Traffic Control Administration |
| NATO | North Atlantic Treaty Organization |
| NATS | NCAR Aircraft (or Airborne) Telemetry System |
| NAUG | NASCOM Augmentation |
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