The Downtown New London Historic District, also known as the Waterfront Historic District, refers to 78 acres (32 ha) with 222 contributing buildings along the waterfront of New London, Connecticut. It was added to the National Register of Historic Places (NRHP) in 1979, with 190 buildings and 60 acres (24 ha). The district was expanded in 1988, adding 18 acres (7.3 ha) and 33 buildings.