Sir Edmund "Toby" Barton was an Australian statesman, barrister and jurist who served as the first prime minister of Australia from 1901 to 1903. He held office as the leader of the Protectionist Party, before resigning in 1903 to become a founding member of the High Court of Australia, on which he served until his death. He was highly regarded as one of the leaders and founding fathers of the Federation movement and for his work in drafting and later interpreting the Constitution of Australia and early federal laws.

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.