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.

Early life and education Anastasios Koutsantonis was born on 23 August 1971 in Adelaide to Greek-Australian parents.

Koutsantonis was encouraged and inspired to get involved in politics by former deputy premier Jack Wright, and first volunteered in Wright's office when he was 14.

Parliament Koutsantonis was elected to the seat of Peake (now West Torrens) at the 1997 election on a margin of 4.5 points, aged 26. and remained in Cabinet until the 2018 state election. Koutsantonis was forced to apologise for his "unacceptable" driving record which listed 58 traffic offences and over $10,000 in fines. He subsequently resigned the road safety portfolio.

Following the retirement of Liberal's Rob Lucas at the 2022 state election, Koutsantonis became the longest-serving member of the South Australian Parliament. His long-serving parliamentary service was recognised by Labor leader Peter Malinauskas in his victory speech on election night. After the election, Malinauskas appointed Koutsantonis as Minister for Infrastructure and Transport and Minister for Energy and Mining.

On 19 September 2025, in a Cabinet reshuffle following announcements by Susan Close and Stephen Mullighan of their resignations at the next state election, Koutsantonis was once again appointed Treasurer. He retains the portfolio of energy and mining, but the infrastructure and transport portfolio was passed to Emily Bourke.

Politics Koutsantonis is considered conservative within Labor politics, and convenes the Labor-right faction of the party.

In February 2010, Koutsantonis sent a letter to his constituents about "vile behaviour" seen at Apex Park on Burbridge Road, West Beach, which was being used as a gay beat. He said that constituents should report lewd acts to police. South Australia Police were aware of attacks apparently targeting gay men at the park. The complaint was rejected because Koutsantonis had not breached the Equal Opportunity Act. He rejected claims that he was homophobic, saying that he had supported gay rights in parliament. He said: "This is not about sexuality. It is about stamping out an illegal activity and preventing children from being exposed to lewd acts and health risks."

In 2021 he was one of three Labor MPs to vote against a Euthanasia Bill He was one of four lower house parliamentarians to vote against the decriminalisation of abortion in 2021, alongside Labor MP Stephen Mullighan and Liberal MPs Stephen Knoll and David Speirs.

Personal life Koutsantonis married Anthea in February 2009, and they have two daughters.