The Central Square Historic District is a historic district encompassing the central town common of the city of Waltham, Massachusetts, and several commercial buildings facing the common or in its immediate vicinity. The common is bounded by Carter, Moody, Main, and Elm Streets; the district includes fourteen buildings, which are located on Main, Elm, Lexington, and Church Streets, on the north and east side of the common. The district was listed on the National Register of Historic Places in 1989.