The Commander-in-Chief of the Australian Defence Force is set out under Section 68 of the Constitution of Australia, stating "the command in chief of the naval and military forces of the Commonwealth is vested in the Governor-General as the King's representative".
Currently the five-star level is not an active serving rank in the Australian Defence Force.
Until his death, His Royal Highness Prince Philip, Duke of Edinburgh held the ranks of Field Marshal, Admiral of the Fleet, and Marshal of the Royal Australian Air Force.
His Majesty George VI was also appointed Marshal of the Royal Australian Air Force, maintaining the rank from 2 June 1939 until his death on 6 February 1952.
In the Australian Public Service, guided by the Public Service Act 1999, the level of three-star rank is the equivalent civilian level of Senior Executive Service Band 3, which is styled as associate secretary or deputy secretary (DEPSEC) or a chief portfolio officer, with the leadership of a group or agency.