Two ships of the Royal Australian Navy (RAN) have been named HMAS Australia. A third ship was to receive the name, but her transfer from the Royal Navy to the Royal Australian Navy was cancelled:
The first HMAS Australia (1911), an Indefatigable-class battlecruiser launched in 1911, shortly after the formation of the Royal Australian Navy, and sunk in 1924 in accordance with the terms of the Washington Naval Treaty.
The second HMAS Australia (D84), a County-class heavy cruiser launched in 1927 and broken up in 1956.
The third HMAS Australia was intended to be renamed from the aircraft carrier HMS Invincible (R05), which the RAN intended to purchase in 1982. This sale was cancelled following the Falklands War and the 1983 Australian federal election.
