The Charles Sumner House is a historic house at 20 Hancock Street on Beacon Hill in Boston, Massachusetts. The brick townhouse, built c. 1806, is notable as the home for many years of the Charles Sumner (1811-1874), an outspoken and aggressive political opponent of slavery, whose beating on the floor of the United States Senate in 1856 was a defining moment of the pre-American Civil War period. The house was designated a National Historic Landmark in 1973.