 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 | — |