Edgartown is a tourist destination on the island of Martha's Vineyard in Dukes County, Massachusetts, United States, for which it is the county seat.
It was once a major whaling port, with historic houses that have been carefully preserved. Today it hosts yachting events around its large harbour. It includes the smaller island of Chappaquiddick.
Edgartown is a part of Massachusetts's 9th congressional district, represented in the Massachusetts Senate as a portion of the Cape and Islands district. Population was 4,067 at the 2010 census.