Sir Adrian Knox KCMG PC KC (29 November 1863 – 27 April 1932) was an Australian lawyer and judge who served as the second Chief Justice of Australia, in office from 1919 to 1930.

[1] Knox was made a King's Counsel in 1906, and shortly after was offered a position on the bench of the Supreme Court of New South Wales, which he declined.

[1] Soon after Knox returned from Egypt, Sir Samuel Griffith retired as the first Chief Justice of the High Court of Australia.

His appointment was received somewhat poorly by Sir Edmund Barton, who as the senior judge on the court and a former prime minister felt a certain entitlement to the position.

[5] Knox sat on a number of judicial committees in this capacity, including one which investigated the British Government's authority to establish the Boundary Commission for Northern Ireland.

[1] Knox was one of six justices of the High Court to have served in the Parliament of New South Wales, along with Edmund Barton, Richard O'Connor, Albert Piddington, Edward McTiernan and H. V. Evatt.

In 1930, Knox was left half of the estate of his friend and mining magnate John Brown, which was reportedly worth more than a million pounds, and in March 1930 he retired from the High Court in order to manage this business.