Ledyard /ˈlɛdʒərd/ is a town in New London County, Connecticut, United States, located along the Thames River. The town is named after Colonel William Ledyard, a Revolutionary War soldier who was killed at the Battle of Groton Heights. The population was 15,051 at the 2010 census. The Foxwoods Resort Casino, owned and operated by the Mashantucket Pequot Tribe, is located in the northeastern section of Ledyard, on land owned by the tribe. Ledyard's zip code is 06339. Within the southwestern area of Ledyard is the district known as Gales Ferry, which has the postal code 06335.

Named for Colonel William Ledyard, slain commander of Colonial forces in the Battle of Groton Heights in September 1781, the town was set off from Groton in 1836 by an act of the Connecticut Legislature. The western section, on the east bank of the Thames River, had been settled in the mid-seventeenth century by Thomas Bayley, John Gager, Robert Allyn and Robert Stoddard. The settlers were farmers, and the river their transportation.

According to the United States Census Bureau, the town has a total area of 40.0 square miles (104 km²), of which 38.1 square miles (99 km²) is land and 1.9 square miles (4.9 km²), or 4.62%, is water. Ledyard is situated north of Groton, and borders the east bank of the Thames River in southeastern Connecticut. The northern half of the Naval Submarine Base New London is located in the southwest corner of the town.

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