Steven Spence Marshall (born 21 January 1968) is an Australian politician and the current South Australian Leader of the Opposition. He has been a Liberal Party of Australia member of the South Australian House of Assembly since 2010, representing the electorates of Norwood (2010-2014) and Dunstan (2014-present).He has been leader of the Liberal Party and Leader of the Opposition since February 2013. He had previously been the party's deputy leader from October 2012 to February 2013.