Mount Greylock Regional School (MGRS) is a public middle school and high school in Williamstown, Massachusetts in the foothills of Mount Greylock. It is part of the Williamstown-Lanesborough Public Schools. The school is located on the site of a former airport in South Williamstown. MGRS serves the communities of Williamstown, Lanesborough, New Ashford and Hancock. Its feeders are Lanesborough Elementary School, Williamstown Elementary School, Hancock Elementary School.