Mark Christopher Butler (born 8 July 1970) is an Australian politician. He is a member of the Australian Labor Party (ALP) and has served in the House of Representatives since 2007. He was a minister in the Gillard and Rudd Governments and also served as national president of the ALP from 2015 to 2018. Butler studied arts and law at the University of Adelaide and international relations at Deakin University. Prior to entering parliament he was the South Australian secretary of the Liquor, Hospitality and Miscellaneous Union (LHMU). He was elected to the seat of Port Adelaide at the 2007 federal election, later switching to Hindmarsh in 2019. Butler was made a parliamentary secretary in 2009, becoming a minister after the 2010 election and winning promotion to cabinet the following year. He subsequently held the portfolios of Minister for Mental Health and Ageing (2010–2013), Social Inclusion (2011–2013), Housing and Homelessness (2013), Environment and Water (2013), and Climate Change (2013). After the ALP's defeat at the 2013 election, Butler was a member of shadow cabinet under opposition leaders Bill Shorten and Anthony Albanese. He is a senior member of the Labor Left faction and was elected to a three-year term as national president in 2015. After the ALP’s win at the 2022 Australian federal election, Butler has held the portfolio of Minister for Health and Aged Care and is the Deputy Leader of the House.