Heysen is a single-member electoral district for the South Australian House of Assembly. It is named after Sir Hans Heysen, a prominent South Australian landscape artist. It is a 1,074 km² electoral district that takes in some of the outer southern suburbs of Adelaide before fanning south-east to include most of the Adelaide Hills, as well as farming areas some distance from the capital. It includes the localities of Aldgate, Ashbourne, Belvidere, , , Blewitt Springs, , Bridgewater, Bugle Ranges, , , Clarendon, Crafers, Dingabledinga, Dorset Vale, Echunga, Flaxley, Gemmells, , Heathfield, , , Ironbank, Jupiter Creek, Kangarilla, Kuitpo, , Kyeema, , Macclesfield, , Meadows, , , Mylor, , Prospect Hill, , , Sandergrove, Scott Creek, Stirling, Strathalbyn, The Range, , Willyaroo, Wistow, Woodc