Sir John Robert Kerr AK GCMG GCVO QC (24 September 1914 – 24 March 1991) was an Australian barrister and judge who served as the 18th governor-general of Australia, in office from 1974 to 1977. He is primarily known for his involvement in the 1975 constitutional crisis, which culminated in the dismissal of Prime Minister Gough Whitlam and the appointment of Malcolm Fraser as caretaker prime minister.
Kerr was born in Sydney to working-class parents. He won scholarships to Fort Street Boys' High School and the University of Sydney, where he studied law. His legal career was interrupted by the Second World War, during which he served with the Australian Army's Directorate of Research and Civil Affairs (DORCA) and attained the rank of colonel. After the war's end he became the inaugural head of the Australian School of Pacific Administration. Kerr returned to the bar in 1949 and became one of Sydney's leading industrial lawyers. He joined the Australian Labor Party (ALP) and was briefly an endorsed candidate for the 1951 federal election. He let his membership lapse after the party split of 1955.