 Ursa Observatory | Finlandia | Helsinki | — |
| Urumqi Magnetic Observatory | República Popular China | — | — |
| USAF Academy Observatory | Estados Unidos | Colorado Springs | — |
 Ussuriysk Astrophysical Observatory | Rusia | Ussuriysk | 274 m |
| Usuda Star Dome | Japón | Prefectura de Nagano | — |
| Uto Observatory | Japón | Uto | — |
| UTP astronomical observatory | Colombia | Pereira | — |
| Utsunomiya observatory | Japón | Utsunomiya | — |
| Utsunomiya-Imaizumi observatory | Japón | Utsunomiya | — |
| UWA observatory | Australia | Crawley Town Football Club | — |
 UWS Rotary Observatory | Australia | New South Wales | — |
| UZAYMER Observatory | Turquía | Sarıçam district | 130 m |
 Uzhhorod Observatory | Ucrania | Úzhgorod | 183 m |
| Uzurano observatory | Japón | Kasai Station | — |
| Vail View observatory | Estados Unidos | Vail | — |
 Vainu Bappu Observatory | India | Kavalur | 706 m |
| Val-des-Bois observatory | Canadá | Val-des-Bois | — |
 Valašské Meziříčí observatory | República Checa | Valašské Meziříčí | 335 m |
| Valdicerro observatory | Italia | Loreto | — |
| Valentia Magnetic Observatory | Irlanda | — | — |
| Valentines observatory | Suiza | Bex | — |
| Valinhos Observatory | Brasil | São Paulo | — |
| Vallauris observatory | Francia | Vallauris | — |
| Valldoreix observatory | España | San Cugat del Vallés | — |
| Valle del Sol Observatory | España | Torreón de la Tercia | — |
| Vallemare di Borbona Astronomical Observatory | Italia | Borbona | 1.170 m |
| Vallinfreda astronomical observatory | Italia | Vallinfreda | — |
 Vallot observatory | Francia | Saint-Gervais-les-Bains | 4.358 m |
| Valmeca observatory | Francia | Puimichel | — |
 Valongo Observatory | Brasil | Río de Janeiro | 14 m |
| Van Allen Observatory | Estados Unidos | Iowa City | — |
| Vanderbilt Dyer Observatory | Estados Unidos | Tennessee | — |
| Vanuatu Geohazards Observatory | Vanuatu | — | — |
| Varennes observatory | Francia | Varennes | — |
 Vartiovuori Observatory | Finlandia | Turku | 46 m |
| Varuna observatory | Italia | Turín | — |
| Vassouras Magnetic Observatory | Brasil | — | — |
 Ved Shala | India | — | — |
| Vedrus Observatory | Rusia | Azóvskaya | — |
| Veen Observatory | Estados Unidos | Míchigan | — |
| Vega del Thader observatory | España | El Palmar | — |
| VEGA observatory | Austria | Austria | — |
 Vega-Sternwarte Salzburg | Austria | Nußdorf am Haunsberg | — |
| Vegaquattro Observatory | Italia | Novi Ligure | — |
| Vega–Bray Observatory | Estados Unidos | Benson | — |
| Velikiye Luki Observatory | Rusia | Óblast de Pskov | — |
 Velizhan sanctuary | Rusia | Tiumén | — |
| Velký Tisý Field Station | Checoslovaquia | Región de Bohemia Meridional | — |