Farmington is a town in Hartford County in the Farmington Valley area of central Connecticut in the United States. The town is part of the Capitol Planning Region. The population was 26,712 at the 2020 census. It sits 10 miles west of Hartford at the hub of major I-84 interchanges, 25 miles south of Bradley International Airport and two hours by car from New York City and Boston. It has been home to the world headquarters of several large corporations including Otis Elevator Company, United Technologies, and Carvel. The northwestern section of Farmington is a suburban neighborhood called Unionville.

Farmington was originally inhabited by the Tunxis Indian tribe. In 1640, a community of English immigrants was established by residents of Hartford, making Farmington the oldest inland settlement west of the Connecticut River and the twelfth oldest community in the state. Settlers found the area ideal because of its rich soil, location along the floodplain of the Farmington River, and valley geography.

The town and river were given their present names in 1645, which is considered the incorporation year of the town. The town's boundaries were later enlarged several times, making it the largest in the Connecticut Colony. The town was named "Farmington" on account of its location within a farming district.

Farmington has been called the "mother of towns" because its vast area was divided to produce nine other central Connecticut communities. The borough of Unionville, in Farmington's northwestern corner, was once home to many factories harnessing the water power of the Farmington River.

Farmington is steeped in New England history. Main Street, in the historic village section, is lined with colonial estates, some of which date back to the 17th century. On May 19, 1774, in response to the adoption of the Boston Port Act, the people of Farmington assembled, held a mock trial for the bill, found the bill guilty of "being instigated by the devil," and subsequently had a copy of the bill hung and then set on fire. During the Revolutionary War, George Washington passed through Farmington on several occasions and referred to the town as "the village of pretty houses." In addition, French troops under General Rochambeau encamped in Farmington en route to Westchester County to offer crucial support to General Washington's army.

The majority of Farmington residents were abolitionists and were active in aiding escaped slaves. Several homes in the town were "safe houses" on the Underground Railroad. The town became known as "Grand Central Station" among escaped slaves and their "guides".

Farmington played an important role in the famous Amistad trial. In 1841, 38 Mende Africans and Cinqué, the leader of the revolt on the Amistad slave ship, were housed and educated in Farmington after the U.S. government refused to provide for their return to Africa following the trial. The Mende were educated in English and Christianity while funds were raised by residents for their return to Africa.

The Farmington Canal, connecting New Haven with Northampton, Massachusetts, passed through the Farmington River on its eastern bank and was in operation between 1828 and 1848. The canal's right of way and towpath were eventually used for a railroad, portions of which were active up to the 1990s. Part of the canal and railroad line has now been converted to multi-use paved trails, called the Farmington Canal Heritage Trail and the Farmington River Trail, respectively.