| 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 | — |
| Eldagsen observatory | Alemania | Springe | — |
| Elena Remote observatory | Chile | San Pedro de Atacama | — |
| Elephant Head observatory | Estados Unidos | East Sahuarita | — |
 Elfordstown Earthstation | Irlanda | — | — |
 Elgin National Watch Company Observatory | Estados Unidos | Illinois | — |
| Elgin obsevatory | Estados Unidos | Elgin | — |
| Elianto observatory | Italia | Provincia de Salerno | — |
| Ellinogermaniki Agogi observatory | Grecia | Pallini Municipality | — |
| Elsterland Observatory | Alemania | Schönewalde | — |
 Embry-Riddle Observatory | Estados Unidos | — | — |
| Emerald Lane Observatory | Estados Unidos | Alabama | 201 m |
| Emirates Observatory | Emiratos Árabes Unidos | Abu Dhabi | — |
| Emmy Observatory | Estados Unidos | New Paltz | — |
| EMSO-France | Francia | — | — |
 Enid High School Observatory | Estados Unidos | Enid | — |
| Enriched Xenon Observatory | Estados Unidos | — | — |
| Entoto Observatory and Research Center | Etiopía | Adís Abeba | 3.200 m |
 Erbil Observatory | Irak | Rawandiz | — |
| Erciyes University Radio Observatory | Turquía | — | 1.050 m |
| Eremo di Tizzano observatory | Italia | Eremo di Tizzano | — |
| Erfurt observatory | Alemania | Érfurt | — |
 Erfurt public observatory | Alemania | — | — |
| Eridanus Observatory | Alemania | Langelsheim | — |
 Erraid Shore Station | Reino Unido | Argyll and Bute | — |
| ESA Cebreros TBT Observatory | España | Distrito de Santa Leonor | — |
 ESA Vigil | — | — | — |
 Eschenberg Observatory | Suiza | Zúrich | — |
| Eskdalemuir Magnetic Observatory | Reino Unido | Dumfries and Galloway | 245 m |
 Eskdalemuir Observatory | Reino Unido | Dumfries and Galloway | — |
| Essen observatory | Alemania | Essen | — |
 Estació sísmica de Garraf | España | Begas | — |
| Estación Anderson Mesa | Estados Unidos | Coconino County | 2.163 m |
| Estación Astronómica Catalina | Estados Unidos | Pima County | — |
 Estación Astronómica de Cerro El Roble | Chile | Cerro El Roble | 2.185 m |
 Estación Astronómica Piszkéstető | Hungría | Mátra | 944 m |
 Estación de Cebreros | España | Cebreros | 794 m |
 Estación de la Cima Ekar | Italia | Asiago | 1.366 m |
 Estación de pájaros de Landsort | Suecia | municipio de Nynäshamn | — |
 Estación radioastronómica de Medicina | Italia | — | — |
| Estación sismológica de Mikazukiyama | Japón | Ogasawara | — |
 Estación sismológica de Sonseca | España | Orgaz | — |
 Estación Terrena Bosque Alegre | Argentina | Departamento Punilla | — |
 Estación Xinglong | República Popular China | Xinglong | 900 m |
| Estación Yakiimo | Japón | Shimizu-ku | — |
| Estels observatory | España | Ager | — |
| Estrella de Mar observatory | España | Torre de Benagalbón | — |
 Etelman Observatory | Estados Unidos | Islas Vírgenes de los Estados Unidos | — |
| Etscorn Observatory | Estados Unidos | Socorro | — |
| Etters observatory | Estados Unidos | Pensilvania | — |
| Etyek observatory | Hungría | Etyek | — |
 Euclid | — | — | — |
| Eulji Observatory | Corea del Sur | Haean-myeon | — |
| Eurac observatory | Italia | Bolzano | — |
 EURECA | — | — | — |
| Eureka Magnetic Observatory | Canadá | Nunavut | — |
| European Gravitational Observatory | Italia | Cascina | — |
| European Southern Observatory | Chile | Ipomoea arborescens | — |
| European Southern Observatory, La Silla-DSS | Chile | Ipomoea arborescens | — |
| Europlanetarium Genk | Bélgica | — | — |
| Evelyn L. Egan Observatory | Estados Unidos | Estero | — |
| Everstar Observatory | Estados Unidos | Olathe | — |
 Evpatoria Observatory | Rusia | Molochno Village Council | — |
| Ex Nihilo Observatory | Estados Unidos | Statham | — |
 Exosat | — | — | — |
| Experimenta observatory | Alemania | Heilbronn | — |
| Experimental Test Site | Estados Unidos | New Mexico | — |
 Experimento de Neutrinos de la Bahía de Daya | República Popular China | — | — |
 Experimento de Neutrinos Subterráneo Profundo | Estados Unidos | Municipio de Winfield | — |
| Experimento del neutrino | — | — | — |
| EXPO-Sternwarte Melle | Alemania | Melle | — |
 Extreme Ultraviolet Explorer | — | — | — |
| Eygalayes observatory | Francia | Eygalayes | — |
| Eyrewell Magnetic Observatory | Nueva Zelanda | — | — |
 Épendes Observatory | Suiza | Friburgo | 680 m |