Port Noarlunga South is a suburb in the Australian state of South Australia located in the Adelaide metropolitan area on the coastline of Gulf St Vincent about 30 kilometres (19 mi) south of the state capital of Adelaide.
Port Noarlunga South started as a private sub-division in 1923 with portions gazetted with the names Paringa and Port Onkaparinga. A portion of land was added to the suburb in 1960 from an area known as Onkaparinga and was subsequently removed in 1995 to create the suburb of Seaford Meadows. In April 2001, the Southport Surf Life Saving Club submitted a proposal to rename parts of both the suburbs of Port Noarlunga and Port Noarlunga South as Southport. However, this proposal was withdrawn in August 2001 following discussions with the City of Onkaparinga regarding "locational identification issues " and replace with a request to "investigate the naming of Southport Beach."
Port Noarlunga South is bounded by the centre of the channel of the Onkaparinga River to the north, the coastline with Gulf St Vincent to the west, Aldam Road to the South and to the east by Commercial Road in part in the south, the centre of the Onkaparinga River in part and a line connecting both parts. Land use within the suburb consists of residential on its west side and 'open space' for land located within the Onkaparinga River Recreation Park on its east side.
Port Noarlunga South is located within the federal Division of Kingston, the state electoral district of Kaurna and the local government area of the City of Onkaparinga.