Greenwich () is a town in southwestern Fairfield County, Connecticut, United States. As of the 2010 census, the town had a total population of 61,171, with a census-estimated increase of 62,574 in 2018. The largest town on Connecticut's Gold Coast, Greenwich is home to many hedge funds and other financial service firms. Greenwich is a principal community of the Bridgeport–Stamford–Norwalk–Danbury metropolitan statistical area, which comprises all of Fairfield County.
Greenwich is the southernmost and westernmost municipality in Connecticut as well as in the six-state region of New England. CNN/Money and Money magazine ranked Greenwich 12th on its list of the "100 Best Places to Live in the United States" in 2005. The town is named after Greenwich, a royal borough of London in the United Kingdom.
The town of Greenwich was settled in 1640. One of the founders was Elizabeth Fones Winthrop, daughter-in-law of John Winthrop, founder and governor of the Massachusetts Bay Colony. What is now called Greenwich Point was known for much of the area's early history as "Elizabeth's Neck" in recognition of Elizabeth Fones and their 1640 purchase of the Point and much of the area now known as Old Greenwich. Greenwich was declared a township by the Connecticut General Assembly in Hartford on May 11, 1665.
During the American Revolution, General Israel Putnam made a daring escape from the British on February 26, 1779 in Greenwich.