| N.P. Wieth-Knudsen Observatory | Dinamarca | Gribskov | — |
| Nachi-Katsuura Observatory | Japón | Prefectura de Wakayama | 10 m |
| Nagano Observatory | Japón | Ōmachi | — |
| Nagatoro observatory | Japón | Nagatoro | — |
| Nagycenk Magnetic Observatory | Hungría | — | — |
 Nahal Oz Observers Memorial Monument | Israel | — | — |
| Nakagawa observatory | Japón | Anan | — |
| Nakagoya Astronomical Observatory “Subaru Dome” | Japón | prefectura de Miyazaki | — |
| Nakanoshima Observatory | Japón | prefectura de Kagoshima | — |
| Nanchuan observatory | República Popular China | Tianhe | — |
| Nankivell Observatory | Nueva Zelanda | Carterton District | — |
| Nanshan Station, Xinjiang Observatory | República Popular China | Urumqi | — |
| Nanyo Observatory | Japón | Prefectura de Yamagata | 252 m |
 Nançay Decameter Array | Francia | — | — |
 Nançay Radio Observatory | Francia | Nançay | — |
 NAOJ Mizusawa Campus | Japón | Ōshū | — |
| Narama observatory | Polonia | Narama | — |
| Narsarsuaq Magnetic Observatory | Groenlandia | — | — |
| 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 | — |
 Nichihara Observatory | Japón | Tsuwano | — |
| Niemegk Magnetic Observatory | Alemania | Niemegk | 78 m |
 Niezaliežnasci Avenue 110, Minsk | Bielorrusia | Minsk | — |
| Nijmegen observatory | Países Bajos | Nimega | — |
| Nijmegen public observatory | Países Bajos | Nimega | — |
| Nimes observatory | Francia | Nîmes | — |
| Nira observatory | España | Tías | — |
| Nishi Kobe observatory | Japón | Kobe Bryant | — |
| Nishi-Harima Observatory | Japón | Prefectura de Hyōgo | — |
 Nishimino Observatory | Japón | Ibigawa | — |
 Nizamia observatory | India | Haidrābād | — |
| NJIT Observatory | Estados Unidos | Newark | — |
| NNHS Drummonds Observatory | Reino Unido | Pitsford | — |
| NOAK Observatory | Grecia | Stavraki Ioanninon | — |
 Nobeyama radio observatory | Japón | Minamimaki | 1.350 m |
| NOIRLab | Estados Unidos | — | — |
| Nomad Observatory | Rusia | Kochevanchik | — |
| Nonndorf observatory | Austria | Nonndorf | — |
| Nora and Hashem Naraghi Hall of Science | Estados Unidos | Turlock | — |
| Norba Caesarina observatory | España | Cáceres | — |
| Norderstedt observatory | Alemania | Norderstedt | — |
| Nordic Optical Telescope observatory | España | Canarias | — |
| Nordvulk | Islandia | — | — |
 Norikura Solar Observatory | Japón | Nyūkawa | — |
| Norma Rose observatory | Australia | Leyburn | — |
 Norman Lockyer Observatory | Reino Unido | Sidmouth | — |
 North Bohemian Observatory and Planetarium in Teplice | República Checa | Teplice | 271 m |
 North cupola of Brno Observatory and Planetarium | República Checa | Veveří | — |
| North Georgia Astronomical Observatory | Estados Unidos | Georgia | — |
| North Mesa Observatory | Estados Unidos | Los Álamos | — |
| North Observatory | Reino Unido | Waterlooville | — |
| North Otago Astronomical Society Observatory | Nueva Zelanda | — | — |
 North Ronaldsay Bird Observatory | Reino Unido | Orcadas | — |
| North Ryde observatory | Australia | North Ryde | — |
| North Scituate observatory | Estados Unidos | Smithville – North Scituate | — |
| Northbrook Meadow Observatory | Estados Unidos | Northbrook | — |
| Northern Arizona University observatory | Estados Unidos | Flagstaff | — |
| Northern Skygems Observatory | España | Nerpio | — |
| Northolt Branch Observatories | Reino Unido | — | — |
| Northolt Branch Observatory | Reino Unido | Municipio de Ealing | — |
| Northolt Branch Observatory 2 | Reino Unido | Hammersmith y Fulham | — |
| Northolt Branch Observatory 3 | Reino Unido | Blandford Forum | — |
 Northumberland Astronomical Society | — | Northumberland | — |
| Northview Observatory | Estados Unidos | Mendon | — |
| Northwest Florida State College observatory | Estados Unidos | Niceville | — |
| Northwest Indiana Robotic Telescope | Estados Unidos | Lowell | — |
| Northwood Ridge Observatory | Estados Unidos | Nuevo Hampshire | — |
 Noto Radio Observatory | Italia | Noto | — |
| Nottingham Weather Centre | Reino Unido | — | — |
| Nova Milanese observatory | Italia | Nova Milanese | — |
| Novaloop observatory | Francia | Mougins | — |
| Novi Ligure observatory | Italia | Novi Ligure | — |
| Novoselki observatory | Ucrania | Novosilky | — |
| Novosibirsk Magnetic Observatory | Rusia | — | — |
| NTT Rokko Astronomical Communication Center | Japón | Prefectura de Hyōgo | — |
| Nubbin Ridge Observatory | Estados Unidos | Arkansas | — |
| Nuevos Horizontes observatory | España | condado de Camas | — |
 Nuffield Radioastronomy Laboratory | Reino Unido | — | — |
| Nurmijarvi Magnetic Observatory | Finlandia | — | — |
 NuSTAR | Estados Unidos | — | — |
| Ny-Ålesund NIPR Observatory | Noruega | Nueva Alesund | — |
| Nyenheim observatory | Países Bajos | Güeldres | — |
 Nyrölä Observatory | Finlandia | Nyrölä | 209 m |