Williamstown is a town in the northern part of Berkshire County, in the northwest corner of Massachusetts, United States. It shares a border with Vermont to the north and New York to the west. It is part of the Pittsfield, Massachusetts Metropolitan Statistical Area. The population was 7,513 at the 2020 census. A college town, it is home to Williams College, the Clark Art Institute and the Tony-awarded Williamstown Theatre Festival.