Sunderland is a town in Franklin County, Massachusetts, United States, part of the Pioneer Valley. The population was 3,663 at the 2020 census. It is part of the Springfield, Massachusetts Metropolitan Statistical Area.
Sunderland was first settled in 1713 and was officially incorporated in 1718. It was first known as Swampfield, a name which is now honored by Swampfield Road, but the name was changed to attract more residents. It was renamed in honor of Charles Spencer, the Earl of Sunderland. Historically, the land was largely used for farming. Before the incorporation of Leverett in 1774, that town was a part of Sunderland's territory.
Sunderland lies on the southern edge of Franklin County, north of Hampshire County. Sunderland is bordered by Montague to the north, Leverett to the east, Amherst and Hadley to the south, and Whately and Deerfield to the west. (Because of the river, there is no direct access between Sunderland and Whately.) From its town center just east of the Connecticut River, Sunderland is 10 miles south of the county seat of Greenfield, 28 miles north of Springfield, and 90 miles west of Boston. Most of the town's population lies in the western part of town, along the river, though there is a small village north of Mount Toby.