Finniss is an electoral district of the House of Assembly in the Australian state of South Australia. It is named after B. T. Finniss, the first Premier of South Australia. It covers a 5,875 km² regional area which includes Kangaroo Island, the Fleurieu Peninsula, and the towns of Kingscote, Middleton, Mount Compass, Penneshaw, Port Elliot, Sellicks Beach, Victor Harbor and Yankalilla.
Kangaroo Island, the Fleurieu Peninsula, Kingscote, Middleton, Mount Compass, Penneshaw, Port Elliot, Sellicks Beach, Victor Harbor and Yankalilla are all within an area that is less than 8750 km. 