Lionel Keith Murphy QC was an Australian politician, barrister, and judge. He was a Senator for New South Wales from 1962 to 1975, serving as Attorney-General in the Whitlam government, and then sat on the High Court from 1975 until his death.

The attorney-general of Australia (AG) is the minister of the Commonwealth of Australia who is the chief law officer of the government. They are charged with overseeing the national legal affairs and public security as the head of the Attorney-General’s Department. The current attorney-general is Mark Dreyfus, who was chosen by prime minister Anthony Albanese on June 2022 following the 2022 federal election. By convention, the attorney-general is a lawyer.