Hallett Cove is a coastal suburb in the south of Adelaide, South Australia, with a population of more than 12,000 people. Adjoining suburbs are Marino to the north, Trott Park and Sheidow Park to the east and Lonsdale to the south. It is within the City of Marion local government area. The Hallett Cove Shopping Centre is the suburb's largest shopping centre, and has recently undergone a major redevelopment. New features include underground parking, a food court, a Big W department store and a Woolworths supermarket in addition to the Drake Foodmarkets owned Foodland already in place.
Hallett Cove itself is a small rocky beach, named after John Hallett, who came across it in 1837 whilst searching for missing stock. The Field River runs out to sea at the southern end. The cliffs to the north are part of the Hallett Cove Conservation Park, featuring Aboriginal artefacts used by the Kaurna tribe and several significant geological features. These include glacial striations on the clifftop discovered by Professor Ralph Tate in 1877, which along with similar striations found earlier at Selwyn's Rock at Inman Valley, 40 km (25 mi) to the south in 1859, provide evidence for the Permian glaciation of southern Australia, then part of Gondwana. There are also a number of large glacial erratics on the beach.