- Abu Reyhan-e Birooni Observatory
- --- 1976
- --- Shiraz University , Shiraz , Iran
- Aker Observatory
- --- Safford , Arizona ( USA )
- Aldershot Observatory
- --- 1906
- --- Aldershot , Hampshire ( United Kingdom )
- Allegheny Observatory
- --- Pittsburgh , Pennsylvania ( USA )
- Angell Hall Observatory
- --- Ann Arbor , Michigan ( USA )
- Anglo-Australian Observatory
- --- 1973
- --- Coonabarabran , Australia
- Antarctic Muon And Neutrino Detector Array (Amanda)
- --- 2002
- --- Antarctic
- Apache Point Observatory
- --- Sunspot , New Mexico ( USA )
- Apollo Observatory
- --- Dayton , Ohio ( USA )
- Arecibo Observatory
- --- Arecibo , Puerto Rico
- Armagh Observatory
- --- 1790
- --- Armagh , Ireland
- Ashton Observatory
- --- 1983
- --- Baxter , Iowa ( USA )
- Asiago Observatory
- --- 1942
- --- Asiago , Italy
- Australia Telescope Compact Array
- --- 1988
- --- Narrabri , Australia
- Badlands Observatory
- --- Quinn , South Dakota ( USA )
- --- 2000
- Baker Observatory
- --- Marshfield , Missouri ( USA )
- Barnard Observatory (No longer in use)
- --- 1844
- --- Oxford , Mississippi ( USA )
- Behlen Observatory
- --- 1972
- --- Mead , Nebraska ( USA )
- Beijing Ancient Observatory
- --- 1442
- --- Beijing , China
- Belogradchik Observatory
- --- 1961
- --- Belogradchik , Bulgaria
- Bergisch Gladbach Observatory
- Berlin Observatory
- --- 1711
- Besancon Observatory
- --- Besancon , France
- Big Bear Lake Solar Observatory
- --- Big Bear City , California ( USA )
- Black Moshannon Observatory
- Bordeaux Observatory
- Boswell Observatory
- --- Crete , Nebraska
- --- Founded: 1883
- Bowman Observatory
- --- Greenwich , Connecticut ( USA )
- Bradstreet Observatory
- --- 1996
- --- St. Davids , Pennsylvania ( USA )
- Bradley Observatory
- --- Decatur , Georgia ( USA )
- Braeside Observatory
- --- Flagstaff , Arizona (USA)
- Brera Observatory
- --- 1764
- --- Milan , Italy
- Brooks Observatory
- --- Toledo , Ohio ( USA )
- Brooks Astronomical Observatory
- --- Mount Pleasant , Michigan ( USA )
- Brorfelde Observatory
- --- Holbæk , Denmark
- Bucknell Observatory
- --- Lewisburg , Pennsylvania ( USA )
- Byurakan Observatory
- --- 1942
- --- Armenian
- Cagliari Observatory
- --- 1899
- --- Cagliari , Sardinia
- Calar Alto Observatory
- --- 1975
- --- Almería , Spain
- Capilla Peak Observatory
- --- Albuquerque , New Mexico ( USA )
- Carter Observatory
- Celestial Observatory
- --- Russellville , Arkansas ( USA )
- Cerro Tololo Inter-American Observatory
- Chamberlin Observatory
- --- 1890
- --- Denver , Colorado ( USA )
- CIDA
- Cheomseongdae (its functions are disputed)
- --- circa 647
- Chico Community Observatory
- --- Chico , California ( USA )
- Coit Observatory
- --- Boston , Massachusetts ( USA )
- Collm Observatory
- --- University Of Leipzig
- Concordia College Observatory
- --- Concordia College
- --- Moorhead , Minnesota
- Copenhagen University Observatory
- --- 1861
- --- Copenhagen , Denmark
- Cordell-Lorenz Observatory
- --- Sewanee , Tennessee ( USA )
- Crane Observatory
- --- Topeka , Kansas ( USA )
- Creighton University Observatory
- --- Omaha , Nebraska
- --- Founded 1886
- Crimean Astrophysical Observatory
- Črni Vrh Observatory
- --- Slovenia
- Cupillari Observatory
- --- La Plume , Pennsylvania ( USA )
- Custer Observatory
- --- Southold , New York ( USA )
- Fabra Observatory
- --- Barcelona , Spain
- Fan Mountain Observatory
- --- 1966
- --- Albemarle County , Virginia ( USA )
- Fernbank Observatory
- --- Atlanta , Georgia ( USA )
- Fick Observatory
- --- 1966
- --- Boone , Iowa ( USA )
- Five College Radio Astronomy Observatory
- --- 1976
- --- New Salem , Massachusetts ( USA )
- Foggy Bottom Observatory
- --- 1951
- --- Hamilton , New York ( USA )
- Foothill Observatory
- --- Los Altos Hills , California ( USA )
- Fox Observatory
- --- Sunrise , Florida ( USA )
- Fox Park Public Observatory
- --- Potterville , Michigan ( USA )
- Francis Marion University Observatory
- --- 1982
- --- Florence , South Carolina ( USA )
- Fremont Peak Observatory
- --- San Juan Bautista , California ( USA )
- Frosty Drew Observatory
- --- Charlestown , Rhode Island ( USA )
- Haggart Observatory
- --- Oregon City , Oregon
- Hamburg Observatory
- --- 1912
- --- Bergedorf , Germany
- Hancock Astrophysical Observatory
- --- San Juan Bautista , California
- Hat Creek Radio Observatory
- Hard Labor Creek Observatory
- --- Atlanta Georgia ( USA )
- Hartung-Boothroyd Observatory
- --- 1974
- --- Ithaca , New York ( USA )
- Harvard College Observatory
- --- 1839
- --- Cambridge , Massachusetts ( USA )
- Haystack Observatory
- --- Westford , Massachusetts
- Herrett Observatory
- --- Twin Falls , Idaho ( USA )
- Hidden Valley Observatory
- --- Rapid City , South Dakota
- Hobbs Observatory
- --- 1974
- --- Fall Creek , Wisconsin ( USA )
- Hoher List Observatory
- --- 1954
- Holcomb Observatory And Planetarium
- --- 1954
- --- Indianapolis , Indiana ( USA )
- Hong Kong Observatory
- --- 1883
- --- Tsim Sha Tsui , Hong Kong ( China )
- Hopkins Observatory
- --- 1838
- --- Williamstown , Massachusetts ( USA )
- Howell Observatory
- --- Starkville , Mississippi
- Hradec Králové Observatory
- --- 1961
- --- Hradec Králové , Czech Republic
- Hyde Memorial Observatory
- --- 1977
- --- Lincoln , Nebraska
- Ladd Observatory
- --- Brown University
- --- 1891
- --- Providence , Rhode Island ( USA )
- Lake Afton Public Observatory
- --- 1979
- --- Wichita , Kansas ( USA )
- La Silla Observatory
- Las Brisas Observatory
- --- 1979
- Las Campanas Observatory
- --- La Serena ( Chile )
- Laws Observatory
- --- Columbia , Missouri ( USA )
- Leander McCormick Observatory
- --- 1885
- --- Mount Jefferson Charlottesville , Virginia ( USA )
- Leiden Observatory
- --- Leiden University
- --- 1633
- --- Leiden , Netherlands
- Leipzig Observatory
- Levenhagen Observatory
- --- Seattle , Washington ( USA )
- Llano De Chajnantor Observatory
- --- Atacama Desert , Chile
- Lick Observatory
- --- 1881
- --- Mount Hamilton , San Jose , California ( USA )
- Lowell Observatory
- --- 1894
- --- Flagstaff , Arizona ( USA )
- Lund Observatory at Lund University (1672, destroyed 1676, refounded 1749)
- Lyon Observatory
- Macalester College Observatory
- --- Saint Paul , Minnesota ( USA )
- Magdelena Ridge Observatory , New Mexico
- Margaret M. Jacoby Observatory
- --- Warwick , Rhode Island ( USA )
- Maria Mitchell Observatory
- --- 1908
- --- Nantucket , Massachusetts ( USA )
- Markree Observatory
- --- 1837
- Marseille Observatory
- Martz Observatory
- --- Chautauqua County , New York ( USA )
- Mauna Kea Observatory
- Mauna Loa Solar Observatory
- Maynard F. Jordan Observatory
- --- 1901
- --- Orono , Maine ( USA )
- McDonald Observatory
- --- University Of Texas At Austin
- McKim Observatory
- --- 1884
- --- Greencastle , Indiana ( USA )
- MDM Observatory
- Mees Observatory
- --- Rochester , New York ( USA )
- Mehalso Observatory
- --- Erie , Pennsylvania ( USA )
- Melbourne Observatory
- --- Melbourne , Victoria , Australia
- Melton Memorial Observatory
- --- 1928
- --- Columbia , South Carolina ( USA )
- Mendenhall Observatory
- --- Stillwater , Oklahoma ( USA )
- Menke Observatory
- --- 1994
- --- Davenport , Iowa
- Merida Observatory
- Meudon Observatory
- --- 1876
- Meyer-Womble Observatory
- --- 1996
- --- Mount Evans , Colorado ( USA )
- Miller Observatory
- --- Maiden , North Carolina ( USA )
- Moletai Astronomical Observatory
- --- 1969
- --- Moletai , Lithuania
- Moore Observatory
- --- 1978
- --- Oldham County , Kentucky ( USA )
- Morris Observatory
- --- North Manchester , Indiana ( USA )
- Morrison Observatory
- Mounds Observatory
- Mount Cuba Astronomical Observatory
- --- Greenville , Delaware ( USA )
- Mount John University Observatory
- ---Lake Tekapo, South Island , New Zealand
- Mount Laguna Observatory
- --- San Diego , California
- --- 1968
- Mount Pleasant Radio Observatory
- --- Tasmania
- Mount Stromlo Observatory
- --- 1911
- --- Australia
- Mount Suhora Observatory
- --- 1987
- --- Poland
- Mount Wilson Observatory
- --- 1904
- Mountain Skies Observatory
- --- Lyman , Wyoming ( USA )
- Mullard Radio Astronomy Observatory
- --- Cambridge , UK
- --- 1957
- Observatorio Nacional De Llano Del Hato , Apartaderos , Merida , Venezeula
- Observatoire Midi-Pyrénées
- --- 1878
- Observatoire De La Côte D'azur (OCA)
- Observatoire Du Mont Mégantic ( OMM )
- --- 1978
- --- Mont Mégantic , Québec, Canada
- Observatorio Del Teide
- --- 1964
- --- Tenerife
- Oil Region Astronomical Observatory
- --- Venango County , Pennsylvania ( USA )
- Ondřejov Observatory (''Observatoř Ondřejov'')
- --- 1898
- --- Ondřejov , Czech Republic
- Osservatorio Astrofisico Di Arcetri
- --- Arcetri , Florence , Italy
- Otter Creek Observatory
- --- 1995
- --- Meade County , Kentucky ( USA )
- Palisades-Dows Observatory
- --- 1987
- --- Cedar Rapids , Iowa ( USA )
- Palomar Observatory
- --- 1948
- Panzano Observatory
- Paranal Observatory
- Paris Observatory
- --- 1667
- Parkes Observatory
- --- 1961
- --- Parkes , Australia
- Paul Robinson Observatory
- --- High Bridge , New Jersey ( USA )
- Perkins Observatory
- --- 1931
- --- Delaware , Ohio ( USA )
- Perth Observatory
- --- Perth, Australia
- Pic Du Midi Observatory
- Pico Dos Dias Observatory
- --- 1981
- --- Minas Gerais , Brazil
- Pine Bluff Observatory
- --- 1958
- --- Cross Plains , Wisconsin ( USA )
- Pine Mountain Observatory
- --- Bend , Oregon ( USA )
- Poznań Observatory
- --- 1919
- --- Poznań , Poland
- Pulkovo Observatory , Russia
- Purple Mountain Observatory
- Radcliffe Observatory ( Oxford )
- Rainwater Observatory
- --- French Camp , Mississippi ( USA )
- Ralph A. Worley Observatory
- --- 1964
- --- Shreveport , Louisiana ( USA )
- Red Buttes Observatory
- --- 1994
- --- Laramie , Wyoming ( USA )
- Riley Observatory
- --- 1974
- --- Naperville , Illinois ( USA )
- RIT Observatory
- --- Rochester , New York ( USA )
- Robert Brownlee Observatory
- --- Lake Arrowhead , California ( USA )
- Robinson Observatory
- --- Orlando , Florida ( USA )
- Robotic Lunar Observatory
- --- 1995
- --- Flagstaff, AZ ( USA )
- Rogers Observatory
- --- Traverse City , Michigan ( USA )
- Rolnick Observatory
- --- Westport , Connecticut ( USA )
- Rome Observatory (Osservatorio Astronomico di Roma)
- Royal Greenwich Observatory
- --- 1675
- Roque De Los Muchachos Observatory , La Palma
- Seven Hills Observatory
- --- 1996
- --- Kearney , Nebraska
- Sherzer Observatory
- --- 1878
- --- Ypsilanti , Michigan ( USA )
- Sisk Observatory
- --- Mulberry , Kansas ( USA )
- Skalnaté Pleso Observatory
- --- Slovakia
- Sola Fide Observatory
- --- Austin , Minnesota ( USA )
- Solar And Heliospheric Observatory
- Sommers-Bausch Observatory
- --- 1949
- --- Boulder , Colorado ( USA )
- Sonnenborgh Observatory
- --- Utrecht , Netherlands
- --- 1853
- Sonoma State Observatory
- --- Rohnert Park , California ( USA )
- South African Astronomical Observatory
- --- Home of the Southern African Large Telescope
- --- Sutherland , South Africa
- Sperry Observatory
- --- Cranford , New Jersey ( USA )
- Sproul Observatory
- --- Swarthmore , Pennsylvania ( USA )
- Stardome Observatory
- --- Auckland , North Island , New Zealand
- Starkenburg Observatory
- Stefanik´s Observatory
- --- Prague , Czech Republic
- Stjerneborg
- --- 1581
- --- Hven , Sweden
- Stockholm Observatory (1749)
- Stokesville Observatory
- Stull Observatory
- --- 1966
- --- Alfred , New York ( USA )
- Stuttgart Observatory
- --- 1920
- --- Stuttgart , Germany
- Sudbury Neutrino Observatory
- --- Sudbury, Ontario
- Sunriver Observatory
- --- Sunriver , Oregon ( USA )
- Warner And Swasey Observatory
- --- 1919
- --- Cleveland , Ohio ( USA )
- Warren Rupp Observatory
- --- 1985
- --- Mansfield , Ohio ( USA )
- Washburn Observatory
- --- 1881
- --- Madison , Wisconsin ( USA )
- Weaver Student Observatory
- --- Monterey , California ( USA )
- Weitkamp Observatory
- --- 1955
- --- Westerville , Ohio ( USA )
- Wilder Observatory
- --- Amherst , Massachusetts ( USA )
- Williams Observatory
- --- Boiling Springs , North Carolina ( USA )
- Whipple Observatory
- --- 1968
- --- Mount Hopkins , Arizona
- Whitin Observatory
- --- 1901
- --- Wellesley , Massachusetts ( USA )
- Winer Observatory
- --- 1983
- --- Sonoita , Arizona ( USA )
- Winfree Observatory
- --- 1900
- --- Lynchburg , Virginia ( USA )
- Wise Observatory
- --- 1971
- --- Negev , Israel
- Witte Observatory
- --- 1984
- --- Mediapolis , Iowa ( USA )
- WIYN Observatory
- --- 1994
- --- Arizona ( USA )
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