The Monarchy of Australia is a form of government in which a hereditary monarch is the sovereign of Australia. The monarchy is a constitutional one modelled on the Westminster style of parliamentary government, incorporating features unique to the Constitution of Australia.
The present monarch is Elizabeth II, styled Queen of Australia, who has reigned since 6 February 1952. She is represented in Australia by the Governor-General, in accordance with the Australian Constitution and Letters Patent from the Queen. In each of the states, the monarch is represented by a governor, appointed directly by the Queen on the advice of each of her respective state governments.
The Australian monarch, besides reigning in Australia, separately serves as monarch for each of fifteen other Commonwealth countries known as Commonwealth realms. This developed from the former colonial relationship of these countries to Britain, but they are now independent of each and legally distinct.