The Maria Mitchell Observatory in Nantucket, Massachusetts, USA, was founded in 1908 and named in honor of Maria Mitchell, the first American woman astronomer. It is a major component of the Maria Mitchell Association.
The Observatory actually consists of two observatories - the main Maria Mitchell Observatory near downtown Nantucket and the Loines Observatory about a kilometer west of town. It is also the repository for a valuable collection of over 8,000 wide-field (13° x 16°) glass photographic plates, recording observations of large swaths of sky from 1913 to 1995.