Penneshaw is a township on the northeast coast of the Dudley Peninsula on Kangaroo Island in the Australian state of South Australia, and is the island's main ferry port with regular services from Cape Jervis. Penneshaw features a Maritime and Folk Museum, and evening tours to a colony of little penguin, the only species of penguin to breed in Australian waters. At the 2011 census, Penneshaw had a population of 276. South Australia's first modern seawater desalination plant was established at Penneshaw in the 1990s, to supplement the town's limited dam water supply.