The Hundred of Noarlunga is a cadastral unit of hundred in South Australia covering the far south-western Adelaide metropolitan area south and west of the Sturt River and north and west of the Onkaparinga River. It is one of the eleven hundreds of the County of Adelaide stretching from Glenelg in the northwest to Port Noarlunga in the southwest; and spanning inland between the Sturt and Onkaparinga to Bridgewater in the Adelaide foothills. It was named in 1846 by Governor Frederick Robe, Noarlunga being likely derived from 'nurlongga', an indigenous word referring to the curvature in the Onkaparinga River at Old Noarlunga, dubbed Horseshoe Bend by European settlers.