Robert Childers Barton was an Anglo-Irish politician, Irish nationalist and farmer who participated in the negotiations leading up to the signature of the Anglo-Irish Treaty. His father was Charles William Barton and his mother was Agnes Alexandra Frances Childers. His wife was Rachel Warren of Boston, daughter of Fiske Warren. His double first cousin and close friend was Erskine Childers.

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.