| NACA | National Advisory Committee On Aeronautics | - | Atmospheric Research Center |
| NAS | Numerical Aerodynamic Simulation | - | Atmospheric Research Center |
| NASA | National Aeronautics And Space Administration | - | Atmospheric Research Center |
| NASDA | NAtional Space Development Agency | - | Atmospheric Research Center |
| NASM | National Air And Space Museum | - | Atmospheric Research Center |
| NASP | National AeroSpace Plane | - | Atmospheric Research Center |
| NBS | National Bureau Of Standards | - | Atmospheric Research Center |
| NDV | NASP Derived Vehicle | - | Atmospheric Research Center |
| NERVA | Nuclear Engine For Rocket Vehicle Application | - | Atmospheric Research Center |
| NESDIS | National Environmental Satellite Data And Information Service. | - | Atmospheric Research Center |
| NGC | New General Catalog | - | Atmospheric Research Center |
| NGT | NASA Ground Terminal | - | Atmospheric Research Center |
| NICMOS | Near Infrared Camera/Multi Object Spectrometer | - | Atmospheric Research Center |
| NIMS | Near Infrared Mapping Spectrometer | - | Atmospheric Research Center |
| NIR | Near InfraRed | - | Atmospheric Research Center |
| NIST | National Institute For Standards And Technology | - | Atmospheric Research Center |
| NLDP | National Launch Development Program | - | Atmospheric Research Center |
| NOAA | National Oceanic And Atmospheric Administration | - | Atmospheric Research Center |
| NOAO | National Optical Astronomy Observatories | - | Atmospheric Research Center |
| NOCC | Network Operations Control Center | - | Atmospheric Research Center |
| NORAD | NORth American Aerospace Defense | - | Atmospheric Research Center |
| NPO | Scientific Production Organization | - | Atmospheric Research Center |
| NPO-PM | NPO Prikladnoi Mekhaniki | - | Atmospheric Research Center |
| NPOE | NPO Energiya | - | Atmospheric Research Center |
| NRAO | National Radio Astronomy Observatory | - | Atmospheric Research Center |
| NRL | Naval Research Laboratory | - | Atmospheric Research Center |
| NRO | National Reconnaissance Office | - | Atmospheric Research Center |
| NRSC | National Remote Sensing Centre | - | Atmospheric Research Center |
| NRSC | National Remote Sensing Centre | - | Atmospheric Research Center |
| NS | Neutron Star | - | Atmospheric Research Center |
| NSA | National Security Agency | - | Atmospheric Research Center |
| NSF | National Science Foundation | - | Atmospheric Research Center |
| NSI | NASA Science Internet / NASA Standard Initiator / National Environmental Satellite Data And Information Service | - | Atmospheric Research Center |
| NSO | National Solar Observatory | - | Atmospheric Research Center |
| NSSDC | National Space Science Data Center | - | Atmospheric Research Center |
| NTR | Nuclear Thermal Rocket(ry) | - | Atmospheric Research Center |
| NTT | New Technology Telescope | - | Atmospheric Research Center |
