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. The town includes the census-designated place of Belchertown. Belchertown was formerly the home of the Belchertown State School. The land on which the school sat is, as of 2016, being redeveloped for mixed uses including residential, commercial and recreational. This includes the 385-acre Lampson Brook Farm, used for community and sustainable agriculture, outdoor recreation, and wildlife preservation.

In 1716, the equivalent lands were sold by Connecticut Colony to residents who reside in present-day Connecticut and Massachusetts. Some of these lands were granted to Jonathan Belcher, the future Royal Governor of Massachusetts.

Belchertown was first settled in 1731 and was officially incorporated in 1761 as Cold Spring, later the name was changed to Belcher's Town, and then Belchertown.

In 1816, part of Belchertown was combined with part of the town of Greenwich, Massachusetts, to form Enfield, Massachusetts. In 1938, Enfield and Greenwich were two of the four towns that were disincorporated to make way for the Quabbin Reservoir, and the northwest part of Enfield was merged back into Belchertown.

The Belchertown State School for mentally disabled residents was located in the town for 70 years, from 1922 until its closing in 1994 amid revelations of poor conditions and inhumane treatment of its residents. The property has since been under consideration for redevelopment housing, business and agricultural use.

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