| NASA Orbital Debris Observatory | Estados Unidos | Cloudcroft | 2.751 m |
| NASA WB-57 Program | — | — | — |
| NASA/MSFC ALAMO Observatory | Estados Unidos | Redstone Arsenal | — |
| Nashville observatory | Estados Unidos | Nashville | — |
| Nastro Verde observatory | Italia | Priora | — |
| Natelli Observatory | Estados Unidos | Frederick | — |
| National Astronomical Observatory "Galileo Galilei" | Bulgaria | Silistra | — |
| National Astronomical Observatory "Slavey Zlatev" | Bulgaria | Kardzhali | — |
| National Astronomical Observatory of China | República Popular China | Pekín | — |
 National Astronomical Observatory of Japan Hawaii Observatory | Estados Unidos | Hawaii County | 4.139 m |
| National Centre for Earth Observation | Reino Unido | — | — |
 National Institute of Geophysics and Volcanology | Italia | — | — |
| National Observatory on Climate Change | Camerún | — | — |
 National Optical Astronomy Observatory | Estados Unidos | Tucson | — |
 National Radio Astronomy Observatory | Estados Unidos | — | — |
 National Research Institute of Astronomy and Geophysics | Egipto | Helwan | — |
 National Solar Observatory | Estados Unidos | Arizona | — |
 National Space Facilities Control and Test Center | Rusia | península de Crimea | — |
| National Time Service Center | República Popular China | Lintong | — |
 National Virtual Observatory | — | — | — |
| Naylor Observatory | Estados Unidos | Pensilvania | — |
 Nayoro Municipal Observatory Kitasubaru | Japón | Nayoro | — |
| Nazaret observatory | España | Nazaret | — |
| Near Earth Object Surveillance Satellite | — | — | — |
| Near-Earth Asteroid Tracking (NEAT) at Palomar observatory | Estados Unidos | California | — |
| Nebula Knoll Observatoy | Estados Unidos | Wakefield | — |
| Negara observatory | Malasia | Langkawi Cable Car | — |
 NenuFAR | Francia | — | — |
 NEO Surveyor | Estados Unidos | — | — |
| NEPTUNE | Canadá | Columbia Británica | — |
 Neschwitz Bird Observatory | Alemania | Neschwitz | — |
 Neue Universitätssternwarte Innsbruck | Austria | Innsbruck | — |
| Neumayer Station III Magnetic Observatory | — | — | — |
 Neumünster public observatory | Alemania | Neumünster | 26 m |
| Neutraubling observatory | Alemania | Neutraubling | — |
 NEVOD | Rusia | — | — |
| New Bullpen Observatory | Estados Unidos | Alpharetta | — |
| New Horizons KBO Search-CFHT | Hawái | Hilo | — |
| New Horizons KBO Search-Magellan/Baade | Chile | Vallenar | — |
| New Horizons KBO Search-Magellan/Clay | Chile | Vallenar | — |
| New Horizons KBO Search-Subaru | Hawái | Hilo | — |
| New Millennium Observatory | Italia | Mozzate | — |
 New Plymouth Observatory | Nueva Zelanda | — | — |
| Newbrook Observatory | Canadá | Alberta | — |
| Newcastle observatory | Canadá | Newcastle | — |
| Newcastle-upon-Tyne observatory | Reino Unido | Newcastle upon Tyne | — |
| Newport Magnetic Observatory | Estados Unidos | — | — |
| NF observatory | Estados Unidos | New Mexico | — |