The Electoral Commission of South Australia (ECSA) in South Australia, a state of Australia, is an independent office which conducts parliamentary state elections every 4 years and is also responsible for the compulsory re-drawing of South Australian House of Assembly electoral districts before each election. The office is led by electoral commissioner Kay Mousley. The electoral commission was the first electoral administration in the world to utilise computer technology to produce an electoral roll, the first prototype roll scanner, and the development and use of cardboard ballot boxes and voting compartments.
In 1907 the then State Electoral Department was established to administer all South Australian parliamentary elections. Since that time more than 120 parliamentary elections, by-elections and referendums have been conducted by this Office. The State Electoral Commissioner was first empowered to conduct miscellaneous elections in 1980 and later in 1990 the Attorney-General gave approval for the Commissioner to be appointed Returning Officer for Local Government elections when requested. In 1999 the Electoral Commissioner was appointed Returning Officer for all Local Government elections.
After the 1989 election, electoral boundaries for lower house seats were legislated to be specifically redistributed by the ECSA in attempts to pursue a fair outcome, being that based on the latest election outcome would see whoever wins more than 50 percent of the two party preferred vote forms government. The gerrymander known as the Playmander ended during LCLSteele Hall's premiership in the late 1960s, with a fairer but not as comprehensive system as from 1989.