The McMahon government was the period of federal executive government of Australia led by Prime Minister William McMahon of the Liberal Party. It was made up of members of a coalition between the Liberal Party and the Country Party, led by Doug Anthony as Deputy Prime Minister. The McMahon government lasted from March 1971 to December 1972, being defeated at the 1972 federal election. Writing for the Australian Dictionary of Biography, Julian Leeser describes McMahon's prime ministership as "a blend of cautious innovation and fundamental orthodoxy".

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.