Darien () is an affluent coastal town in Fairfield County, Connecticut, United States 37 miles northeast of New York City. With a population of 21,000 and a land area of just under 13 square miles, it is the smallest town on Connecticut's "Gold Coast" and is one of the wealthiest towns in the country. It has the youngest population of any non-college town in Connecticut, a high rate of marriage, and high number of average children per household. Darien is also one of the wealthiest communities in the U.S.
Situated on Long Island Sound between the cities of Stamford and Norwalk, the town has relatively few office buildings. Many residents commute to Manhattan with two Metro-North railroad stations–Noroton Heights and Darien–linking the town to Grand Central Terminal. For recreation, the town boasts eleven parks, two public beaches, the private Tokeneke beach club, three country clubs including the first organized golf club in Connecticut, a riding & racquet club, the public Darien Boat Club, and Noroton Yacht Club.
According to early records, the first clearings of land were made by men from the New Haven and Wethersfield colonies and from Norwalk in about 1641. It was not until 1739, however, that the Middlesex Society of the Town of Stamford built the first community church, now the First Congregational Church of Darien (which stands on the original site at the corner of Brookside Road and the Boston Post Road).
Tories raided the town several times during the Revolution, at one point taking 26 men in the parish prisoner for five months, including the Reverend Moses Mather, pastor of the parish. The Loyalist-Patriot conflict in Darien is the setting for the novel Tory Hole, the first book by children's author Louise Hall Tharp. Middlesex Parish was incorporated as the Town of Darien in 1820.