Aldinga Beach is an outer southern suburb of Adelaide, South Australia. It lies within the City of Onkaparinga and has the postcode 5173. At the 2011 Census, Aldinga Beach had a population of 9,697.
Aldinga Beach Post Office opened on 1 March 1960.
Aldinga Beach known as Dingy to the local residents. pronounced ding-ee
The Aldinga Scrub Conservation Park is located within the southern extent of the suburb and on land in the adjoining suburb of Sellicks Beach.
Aldinga Reef aquatic reserve is a protected area located immediately offshore of both Aldinga Beach and Port Willunga. It was declared in 1971 to protect ‘aquatic plants and animals associated with the large intertidal limestone reef and the spectacular precipitous underwater cliff known as the ‘drop-off’ and the surrounding sandy substrate for the purposes of education and recreation’. The activities of fishing and the collection or removal any marine organism are prohibited, while the following activities are permitted - use of boats, swimming, snorkelling, scuba diving and walking on the intertidal reef exposed at low water. The reserve extends seaward a distance of about 2 kilometres (1.2 mi) around a headland named Snapper Point from Thomas Street, Aldinga Beach in the south to Seaborne Avenue, Port Willunga in the north.