Sir William McMahon was an Australian politician who served as the 20th prime minister of Australia from 1971 to 1972. He held office as the leader of the Liberal Party of Australia. He was a government minister for over 21 years, the longest continuous service in Australian history.

The Holt government was the federal executive government of Australia led by Prime Minister Harold Holt. It was made up of members of a Liberal-Country Party coalition in the Australian Parliament from 26 January 1966 to 19 December 1967.