Tom Koutsantonis

Anastasios "Tom" Koutsantonis (born 23 August 1971) is an Australian politician in the South Australian Labor Party, representing the seats of West Torrens (2002−current) and Peake (1997−2002) in the South Australian House of Assembly. He has served as Minister for Energy and Mining and as Leader of Government Business in the House of Assembly since 2022 and as the Treasurer of South Australia since 2025 in the first and second Malinauskas ministries. Koutsantonis served as Treasurer and minister for other portfolios in the Weatherill cabinet between 2011 and 2018.

From March 2022, Koutsantonis served as the Minister for Infrastructure and Transport and the Minister for Energy and Mining in the Malinauskas ministry. On 19 September 2025, in a Cabinet reshuffle owing to the resignation of two front benchers, he was once again appointed Treasurer. He retains the portfolio of energy and mining, but lost the infrastructure and transport portfolio.