The Provisional Government of Ireland was the provisional government for the administration of Southern Ireland from 16 January 1922 to 5 December 1922. It was a transitional administration for the period between the ratification of the Anglo-Irish Treaty and the establishment of the Irish Free State. Its legitimacy was disputed by the Anti-Treaty members of Dáil Éireann.

The 1921 Anglo-Irish Treaty, commonly known in Ireland as The Treaty and officially the Articles of Agreement for a Treaty Between Great Britain and Ireland, was an agreement between the government of the United Kingdom of Great Britain and Ireland and representatives of the Irish Republic that concluded the Irish War of Independence. It provided for the establishment of the Irish Free State within a year as a self-governing dominion within the "community of nations known as the British Empire", a status "the same as that of the Dominion of Canada". It also provided Northern Ireland, which had been created by the Government of Ireland Act 1920, an option to opt out of the Irish Free State, which the Parliament of Northern Ireland exercised.