Sir John Robert Kerr (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 his decision to dismiss the incumbent prime minister Gough Whitlam and appoint Malcolm Fraser as his replacement, unprecedented actions in Australian federal politics.