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 electorate of Dunstan (known as Norwood before 2014).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.