Belchertown (previously known as Cold Spring and Belcher's Town) is a town in Hampshire County, Massachusetts, United States. It is part of the Springfield, Massachusetts Metropolitan Statistical Area. The population was 14,649 at the 2010 census. It is the home of Belchertown High School and the infamous Belchertown State School mental institution (closed in 1992). Part of the town is part of the census-designated place of Belchertown.
In 1716, land was sold by Connecticut residents who resided in Connecticut and Massachusetts. Some of the land was granted to Jonathan Belcher, the future Royal Governor of Massachusetts.
Belchertown was first settled in 1731 and was officially incorporated in 1761.