The Octagon House in Watertown, Wisconsin, also known as the Octagon House Museum or the John Richards Octagon House, was built in 1854 and was listed on the National Register of Historic Places in 1971. It is one of many octagon houses built in the United States in the mid-19th century. In 1950 architect Rexford Newcomb wrote, "...probably the best-planned octagon house in the country is the John Richards House at Watertown, Wisconsin..."