Proclamation Day commonly refers to the anniversary of the proclamation of government of the province of South Australia, which continues to be celebrated in South Australia on 28 December, although no longer a public holiday. The anniversary of the establishment of self-government on 21 October 1890 was formerly known as Proclamation Day in Western Australia.

British colonisation of South Australia describes the planning and establishment of the colony of South Australia by the British government, covering the period from 1829, when the idea was raised by the then-imprisoned Edward Gibbon Wakefield, to 1842, when the South Australia Act 1842 changed the form of government to a Crown colony.