Greenwich (/ˈɡriːnwɪtʃ/)^[1] was a town in Hampshire County, Massachusetts, United States. The town was lost as a result of the formation of the Quabbin Reservoir in order to supply Boston's growing water needs.

Greenwich was established in 1739 as Quabbin, incorporated as Quabbin Parish in 1754, and became the town of Greenwich (named for John Campbell, Duke of Greenwich) in 1754. It was located along the East and Middle branches of the Swift River. The Athol Branch of the Boston and Albany Railroad ran through the center of town, as did Route 21. It was well known for its lakes and ponds, which were popular vacation spots. It bordered four towns—Enfield, Prescott, Dana, and Hardwick.

H. P. Lovecraft's fictional town of Dunwich in his seminal story "The Dunwich Horror" was partially based on the town of Greenwich.^[2] Additionally, Lovecraft's story "The Colour Out of Space" is set in this valley before it was flooded for the reservoir.^[3]

Greenwich 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. (Because of the redrawing of town lines, the land is no longer completely in Hampshire County; only the portion located in Ware is.) Because most of Greenwich was at lower elevation than the surrounding towns, it is now largely submerged, except for the hilltops of Curtis Hill, Mount Lizzie and Mount Pomeroy, which are now islands.

• 
  Camp Pomeroy, camps, Greenwich, Mass., Mar. 15, 1928 Parcel no. 410–3, George Haupt et al., March 15, 1928. Massachusetts. Executive Office of Energy and Environmental Affairs, Metropolitan District Water Supply Commission, Quabbin Reservoir, Photographs of Real Estate Takings, Massachusetts Archives
• 
  Camp Quabbin, camps, Greenwich, Mass., Apr. 4, 1928 Parcel no. 330–70, George Haupt et al., April 4, 1928. Massachusetts. Executive Office of Energy and Environmental Affairs, Metropolitan District Water Supply Commission, Quabbin Reservoir, Photographs of Real Estate Takings, Massachusetts Archives
• 
  Addison D. Moore, icehouse, Greenwich, Mass., Dec. 23, 1932 Parcel no. 309–24, Addison D. and Frances M. Moore, December 23, 1932. Massachusetts. Executive Office of Energy and Environmental Affairs, Metropolitan District Water Supply Commission, Quabbin Reservoir, Photographs of Real Estate Takings, Massachusetts Archives

• Mason C. Darling (1801–1866), Massachusetts and Wisconsin physician, legislator
• Joseph Pomeroy Root (1826–1885), Free Stater, first Lieutenant Governor of Kansas
• Randolph Barnes Marcy (1812-1887), Major General, U.S. Army, Civil War
• Amiel Weeks Whipple (1816-1863), Major General, U.S. Army; mortally wounded at the Battle of Chancellorsville, May 3, 1863; died on May 7

• Greenwich House, an on-campus living facility at Hampshire College in Amherst, Massachusetts, is named after the former town.

• Tougias, Michael. Quabbin: A History and Explorer's Guide. Yarmouth Port, Mass.: On Cape Publications, 2002.

• Media related to Records, 1734-1916 (Greenwich) at Wikimedia Commons
• Map showing the towns buried under Quabbin as they looked in 1912, with original house locations and current reservoir water level

v t e Municipalities and communities of Hampshire County, Massachusetts, United States
County seat: Northampton
Cities	Easthampton Northampton
Towns	Amherst Belchertown Chesterfield Cummington Goshen Granby Hadley Hatfield Huntington Middlefield Pelham Plainfield South Hadley Southampton Ware Westhampton Williamsburg Worthington
CDPs	Amherst Center Belchertown (CDP) Granby (CDP) Hatfield (CDP) Huntington (CDP) North Amherst South Amherst Ware (CDP)
Other villages	Bondsville‡ Florence Leeds Mount Tom
Footnotes	‡This populated place also has portions in an adjacent county or counties
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