 Dunsink Observatory | Irlanda | Dublín | — |
 Durham University Observatory | Reino Unido | ciudad de Durham | — |
| Duronia Magnetic Observatory | Italia | — | — |
| Durtal observatory | Francia | Durtal | — |
| Dushak-Erekdag Observatory | Turkmenistán | Provincia de Ahal | 2.020 m |
| Dushanbe Observatory | Tayikistán | Dusambé | — |
 Dwingeloo Radio Observatory | Países Bajos | Westerveld | — |
| Earl Hill observatory | Australia | Trinity Beach | — |
 Earlham College Observatory | Estados Unidos | Richmond | — |
| Earls Barton observatory | Reino Unido | Earls Barton | — |
| Earth Observatory of Singapore | Singapur | Western Water Catchment | — |
| East Asian Observatory | — | — | — |
| East Rome Observatory | Italia | Roma | — |
| Eastern Illinois University observatory | Estados Unidos | Charleston | — |
| Eastfield observatory | Reino Unido | West and Middle Chinnock | — |
| Eastwood Observatory | Reino Unido | Leigh-on-Sea | — |
| Ebersheim Observatory | Alemania | Maguncia | — |
| Ebro Magnetic Observatory | España | — | — |
| ECCCO Observatory | Argentina | RUINAS DE LA ESTANCIA | — |
| EChO | — | — | — |
| Eckdorf observatory | Alemania | Brühl | — |
| Ecological and Citizen Transition Côte d'Azur observatory | Francia | Niza | — |
| Eddington | — | — | — |
| Eden Astronomical Observatory | Pakistán | Lahore | — |
| Eden Observatory | Reino Unido | Banham | — |
| Edmund Kline observatory | Estados Unidos | Deer Trail | — |
| Edwards Raven Observatory | Estados Unidos | Estados Unidos | — |
| Efdoxos Observatory | Grecia | Kefalonia Municipality | — |
| EG observatory | Alemania | Lippstadt | — |
 Ege University Observatory | Turquía | Buca | — |
| EHB01 Observatory | Alemania | Wiesenttal | — |
 Eilenburg Observatory | Alemania | Eilenburg | 113 m |
| EISCAT Tromso UHF | Noruega | Tromsø | — |
| EIXOS | España | — | — |
| El Berrueco observatory | España | Madrid | — |
| El Boalo Observatory | España | El Boalo | — |
| El Catalejo observatory | Argentina | Santa Rosa | — |
| El Cielo de Consell observatory | España | Islas Baleares | — |
| El Condor Observatory | Argentina | Córdoba | — |
| El Far observatory | España | Alfar | — |
| El Gato Gris observatory | Argentina | TANTI NUEVO LS | — |
| El Guijo Observatory | España | Collado Villalba | — |
| El Maestrat Observatory | España | Adzaneta | — |
| El Manzanillo Observatory | España | Málaga | — |
| El Salvador Institute of Earth Sciences | El Salvador | — | — |
| El Teatrillo de Lyra observatory | España | Ager | — |
| El Vendrell observatory | España | Vendrell | — |
| Elche observatory | España | Bonavista | — |