Dwight Foster was an American lawyer and politician from Brookfield, Massachusetts. He graduated from the College in the English Colony of Rhode Island and Providence Plantations at Providence in 1774. He served in the Massachusetts House of Representatives and represented Massachusetts in both the United States House of Representatives and U.S. Senate. Foster died in Brookfield, aged 65, and is buried in Brookfield Cemetery. He was the brother of US Senator Theodore Foster, and was the grandfather and namesake of Dwight Foster MA.