Sir James Plimsoll, AC, CBE (25 April 1917 – 8 May 1987) was an Australian diplomat and public servant. He served variously as Permanent Representative to the United Nations (1959–1963), High Commissioner to India (1963–1965), Secretary of the Department of External Affairs (1965–1970), Ambassador to the United States (1970–1973), Ambassador to the Soviet Union (1974–1977), Ambassador to Belgium and the European Economic Community (1977–1980), High Commissioner to the United Kingdom (1980–1981), Ambassador to Japan (1981–1982), and Governor of Tasmania (1982–1987).