Dr David Oliver Tonkin AO (20 July 1929 – 2 October 2000) was the 38th Premier of South Australia, serving from 18 September 1979 to 10 November 1982. He was elected to the House of Assembly seat of Bragg at the 1970 election, serving until 1983. He became the leader of the South Australian division of the Liberal Party of Australia in 1975, replacing Bruce Eastick.