Stamford () is a city in the U.S. state of Connecticut. It is the second-most populous city in Fairfield County with a population of 122,643 at the 2010 census, and 129,638 in 2019. Stamford is the third-largest city by population in Connecticut (behind Bridgeport and New Haven). Approximately halfway between Manhattan and New Haven at approximately 38 miles (60 kilometers) from each, Stamford is in the Bridgeport-Stamford-Norwalk-Danbury metropolitan statistical area which is a part of the New York City metropolitan area.
Stamford is home to nine Fortune 500 companies as of 2019, as well as numerous divisions of large corporations. This gives Stamford the largest financial district in the New York metropolitan region outside New York City itself and one of the largest concentrations of corporations in the United States. Dominant sectors of its economy include financial services, tourism, information technology, healthcare, telecommunications, transportation, and retail. Its metropolitan division is home to colleges and universities including UConn Stamford and Norwalk Community College.
Stamford was known as Rippowam by the Siwanoy Native American inhabitants to the region, and the very first European settlers to the area also referred to it as such. The present name is after the town of Stamford, Lincolnshire, England.