Wethersfield is a town in Hartford County, Connecticut, USA, immediately south of Hartford along the Connecticut River. Many records from colonial times spell the name "Weathersfield", while Native Americans called it "Pyquag". The town's motto is "Ye Most Auncient Towne in Connecticut", and its population was 26,668 in the 2010 census. The town is primarily served by Interstate 91. The neighborhood known as Old Wethersfield is the state's largest historic district, spanning two square miles and 1,100 buildings, dating back to the 17th, 18th and 19th centuries.

Founded in 1634 by a Puritan settlement party of "10 Men" including John Oldham, Robert Seeley, Thomas Topping and Nathaniel Foote, Wethersfield is arguably the oldest town in Connecticut, depending on one's interpretation of when a remote settlement qualifies as a "town". Along with Windsor and Hartford, Wethersfield is represented by one of the three grapevines on the Flag of Connecticut, signifying the state's three oldest European settlements. The town took its name from Wethersfield, a village in the English county of Essex.

During the Pequot War, on April 23, 1637, Wongunk chief Sequin attacked Wethersfield with Pequot help. They killed six men and three women, a number of cattle and horses, and took two young girls captive. They were daughters of Abraham Swain or William Swaine (sources vary) and were later ransomed by Dutch traders.

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