Mount Gambier is an electorate for the South Australian House of Assembly. It covers the southeast part of the state centered on the city and extinct volcano of Mount Gambier, containing the City of Mount Gambier and District Council of Grant local government areas. The electorate was created in the 1936 redistribution, taking effect at the 1938 election, but the name was not used between the 1993 and 2002 elections (the area was covered by Gordon during that time).