W
| Name | Established | Location |
| Warner Observatory | 1882 | Rochester, New York, USA |
| Warner and Swasey Observatory | 1919 | Cleveland, Ohio, USA |
| Warren Rupp Observatory | 1985 | Mansfield, Ohio, USA |
| Warsaw University Observatory | 1825 | Warsaw, Poland |
| Washburn Observatory | 1881 | Madison, Wisconsin, USA |
| Weaver Student Observatory | Monterey, California, USA | |
| Weitkamp Observatory | 1955 | Westerville, Ohio, USA |
| West Mountain Observatory | 1981 | West Mountain (Utah) USA |
| Whipple Observatory | 1968 | Mount Hopkins, Arizona, USA |
| Whitin Observatory | 1901 | Wellesley, Massachusetts, USA |
| Widener University Observatory | 2004 | Chester, Pennsylvania, USA |
| Wilder Observatory | Amherst, Massachusetts, USA | |
| Willard L. Eccles Observatory | 2009 | Frisco Peak, Utah, USA |
| Williams Observatory | 1990 | Boiling Springs, North Carolina, 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 | Kitt Peak, Arizona, USA |
| Wyoming Infrared Observatory | 1975 | Laramine, Wyoming, USA |
Read more about this topic: List Of Astronomical Observatories
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