The Institute of Public Affairs (IPA) is a conservative non-profit free market public policy think tank based in Melbourne, Victoria, Australia. It advocates free market economic policies such as free markets, privatisation, deregulation of state-owned enterprises, trade liberalisation, deregulation of workplaces as well as climate change denial, abolition of the minimum wage, anti-socialism, and repeal of section 18C in the Racial Discrimination Act 1975.
The IPA was founded during World War II by businessmen in response to the growing power of the Labor Party and international socialism, and has typically aligned with, and supported, the Liberal Party in politics. It has in the past funded and created advertising campaigns for anti-Labor candidates, and has been described as a "satellite" of the Liberal Party.