Mark Christopher Butler is an Australian politician and a member of the Australian Labor Party, representing the electoral division of Hindmarsh in the Australian House of Representatives since 2019, and previously the Port Adelaide from 2007 to 2019. He served as Minister for Climate Change and Minister for the Environment, Heritage and Water in the Second Rudd Ministry. At the change of government following the 2013 Federal Election he became Shadow Minister for Environment, Climate Change and Water, and after the 2016 Federal Election the Shadow Minister for Climate Change and Energy. Before entering parliament, Butler was the South Australian secretary of the Liquour, Hospitality and Miscellaneous Workers Union (LHMU).