Ian Castles AO OBE (20 February 1935 – 2 August 2010) was Secretary of the Australian Government Department of Finance (1979–86), the Australian Statistician (1986–94), and a Visiting Fellow at the Asia Pacific School of Economics and Government at the Australian National University, Canberra.
in 1954, he joined the Australian Public Service in the archives division of the National Library of Australia, then located in Melbourne, and moved to Canberra in 1957.
He was a contributor to Online Opinion, appeared at events hosted by the Institute of Public Affairs and Centre for Independent Studies, and published papers with The Lavoisier Group.
Ian Castles was known for his criticism of the Intergovernmental Panel on Climate Change, particularly its Special Report on Emissions Scenarios.
[4] His interests included research into the information requirements for public policy (especially at the international level) and the history of economic thought.