Helen Lloyd Coonan is a former Australian politician who was a Senator for New South Wales from 1996 to 2011, representing the Liberal Party. She was a minister in the Howard government, serving as Minister for Revenue and Assistant Treasurer from 2001 to 2004 and then as Minister for Communications, Information Technology and the Arts from 2004 to 2007.

The Assistant Treasurer of Australia is the minister of state of the Commonwealth of Australia charged with assisting the Treasurer with overseeing government revenue collection, federal expenditure and economic policy as the head of the Department of the Treasury. The current assistant treasurer is The Hon. Stephen Jones MP, who was appointed by Prime Minister Anthony Albanese in May 2022 following the 2022 Australian federal election. Jones also serves as Minister for Financial Services.