One ship of the Royal Navy and two ships of the Royal Australian Navy have borne the name Australia:

• The first, HMS Australia, (a Royal Navy ship styled HMS as the Royal Australian Navy had not yet been formed) was an Orlando class cruiser completed in 1888 and scrapped in 1905.

• The second, HMAS Australia (now styled HMAS after the formation of the Royal Australian Navy in 1911) was an Indefatigable class battlecruiser launched in 1911 and sunk in 1924 in accordance with the terms of the Washington Naval Treaty.

• The third, HMAS Australia was a County class heavy cruiser launched in 1927 and broken up in 1956.