Nepean Bay is a locality in the Australian state of South Australia located on the southern shore of Western Cove in Nepean Bay on the north coast of Kangaroo Island and about 128 kilometres (80 miles) south-west of the state capital of Adelaide and about 10 kilometres (6.2 miles) south-south-west of the municipal seat of Kingscote.

[9] Its boundaries were created in May 2002 for “the long established name” which is derived from the adjoining bay.

The Nepean Bay Conservation Park is also located within the locality about 1.5 kilometres (0.93 mi) to the east of the settlement.

[2][8] The 2016 Australian census which was conducted in August 2016 reports that Nepean Bay had a population of 131 people.

[10] Nepean Bay is located within the federal division of Mayo, the state electoral district of Mawson and the local government area of the Kangaroo Island Council.