The prime minister of Australia is the head of government of the Commonwealth of Australia. The prime minister chairs the Cabinet and thus heads the federal executive government. Under the principles of responsible government, the prime minister is both a member and responsible to Parliament. The current prime minister is Anthony Albanese of the Australian Labor Party, who assumed the office on 23 May 2022.

The Constitution of Australia is the fundamental law that governs the political structure of Australia. It is a written constitution, that establishes the country as a federation under a constitutional monarchy governed with a parliamentary system. Its eight chapters sets down the structure and powers of the three constituent parts of the federal level of government: the Parliament, the executive government and the judicature.