Larchmont is a village in Westchester County, New York. The population was 5,864 at the 2010 census. It is located within the Town of Mamaroneck, on the shore of Long Island Sound, 18 miles (29 km) northeast of Midtown Manhattan. Larchmont is served by the New Haven Line of the Metro-North Railroad.

In July 2005, CNN/Money and Money magazine ranked Larchmont 11th on its list of the 100 Best Places to Live in the United States.

Originally inhabited by the Siwanoy (an Algonquian tribe), Larchmont was discovered by the Dutch in 1614. By 1720, few Siwanoy remained in the Larchmont area and the land had been largely bought up by British and Dutch settlers.

Larchmont's oldest and most historic home, the "Manor House" on Elm Avenue, was built in 1797 by Peter Jay Munro. Munro was the nephew of John Jay, the first Chief Justice of the United States Supreme Court, and was later adopted by Jay. At the beginning of the 19th Century, Munro was active in the abolitionist movement, helping to found the NY State Manumission Society, along with his uncle and Alexander Hamilton. Munro's house faced towards the Boston Post Road (the back is now used as the front), which tended to generate a lot of dust in summer months. To combat this, his gardener imported a Scottish species of larch trees that were known to be fast growing. These were planted along the front of the property, eventually giving the village its name. The Village of Larchmont was incorporated in 1891.