Greenwich (which was pronounced Green-which, not Gren-ich) is a former town in Massachusetts. It was incorporated in 1754 and located in Hampshire County. It was disincorporated on April 28, 1938 as part of the creation of the Quabbin Reservoir. Upon disincorporation, portions of the town were annexed to the adjacent towns of Hardwick, New Salem, Petersham, and Ware. It is now largely below water.
