| Term | Definition / Meaning / Stand for |
| NANTEN |
A millimeter-wavelength radio telescope in Japan |
| NACR |
NASA Astrobiology and Climate Research |
| NCTS |
NASA Consolidated Travel Services |
| NCCD |
NASA Cosmic Distance Scale |
| NExScI |
NASA Exoplanet Science Institute |
| NLE |
NASA Lunar Exploration |
| NSG |
NASA Science Goals |
| NSR |
NASA Scientific Research |
| NTE |
NASA Technology Experiment |
| NED |
NASA/IPAC Extragalactic Database |
| NEID |
NN-EXPLORE Exoplanet Investigations with Doppler spectroscopy |
| NHC |
Nag Hammadi Codices |
| NRT |
Nancay Radio Telescope |
| NAC |
Narrow Angle Camera |
| NAC |
Narrow-Angle Camera |
| NLS1 |
Narrow-Line Seyfert 1 |
| NBSR |
National Bureau of Standards Reactor |
| NCSER |
National Center for Science Education Resources |
| NHA |
National Hydrography Dataset |
| NSF-NRAO |
National Science Foundation - National Radio Astronomy Observatory |
| NSAS |
National Space Astronomy Survey |
| NSSA |
National Space Science Agency |
| NRG |
Natural Radiant Guidance |
| NOM |
Nature of Mind |
| NICS |
Near Infrared Camera and Spectrometer |
| NDEr |
Near-Death Experiencer |
| NEOCam |
Near-Earth Object Camera |
| NEOCC |
Near-Earth Object Coordination Centre |
| NEOSSat |
Near-Earth Object Surveillance Satellite |
| NEP |
Near-Earth Plasma |
| NIRSO |
Near-Infrared Solar Observatory |
| NIRSpec |
Near-Infrared Spectrograph |
| NIRSPEC |
Near-Infrared Spectrometer |
| NRE |
Near-Realm Experience |
| NUV |
Near-Ultraviolet |
| NVE |
Near-Void Experience |
| NAT |
Neutral Atmosphere |
| NISM |
Neutral Interstellar Medium |
| NHR |
Neutron Halo Radius |
| NPS |
Neutron Production System |
| NAE |
New Age Enlightenment |
| NAM |
New Age Movement |
| NAW |
New Age Wisdom |
| NEO |
New Earth Order |
| NEROC |
New England Research and Optical Corporation |
| NGAIA |
New Gaia Ascension |
| NGA |
New Galactic Alignment |
| NGC |
New Generation Consciousness |
| NHA |
New Human Awakening |
| NIT |
New Inner Transformation |
| NIA |
New Insight Awareness |
| NESSI |
New Mexico Exoplanet Spectroscopic Survey Instrument |
| NMSU-A |
New Mexico State University Astronomy |
| NRAH |
New Reality Ascension Healing |
| NSS |
New Soul School |
| NTA |
New Thought Awareness |
| NWM |
New Wave Meditation |
| NExSS |
Nexus for Exoplanet System Science |
| NIRV |
Nirvana (Buddhist term for enlightenment) |
| NFC |
No-Form Consciousness |
| NMT |
No-Mind Technique |
| NAD |
Non-Attached Dimension |
| NOMAD |
Non-Attached Divine Awareness |
| NAP |
Non-Attached Presence |
| NBO |
Non-Baryonic Object |
| NBL |
Non-Binding Love |
| NCL |
Non-Clinging Life |
| NCAW |
Non-Conceptual Awareness |
| NCS |
Non-Conceptual Self |
| NCS |
Non-Conceptual Silence |