The South End Historical Society or <small>SEHS,</small> is a non-profit community organization founded in 1966, and dedicated to the preservation of the built environment and revitalization of the South End neighborhood in Boston, Massachusetts, USA. In 1972, the South End neighborhood was placed on the National Register of Historic Places as the largest extant Victorian rowhouse district in the United States. In 1983, the district achieved designation as a Boston Landmark District, by the City of Boston, bringing with it legal protection and public review of alterations to buildings within the district.
During the organization's first thirty years, the <small>SEHS</small> has worked to retain and restore architectural integrity of the South End. The <small>SEHS</small> supports research, conservation, and education to protect and promote interest in the local historic buildings, monuments, and public squares of the South End.