The Royal Irish Constabulary simply called the Irish Constabulary 1836–67) was the police force in Ireland from the early nineteenth century until 1922. A separate civic police force, the unarmed Dublin Metropolitan Police
, controlled the capital, and the cities of Derry and Belfast, originally with their own police forces, later had special divisions within the RIC. About seventy-five percent of the RIC were Roman Catholic and about twenty-five percent were of various Protestant denominations.
The RIC's successful system of policing influenced the armed Canadian North-West Mounted Police (predecessor of the Royal Canadian Mounted Police), the armed Victoria Police force in Australia, and the armed Royal Newfoundland Constabulary in Newfoundland.
In consequence of the Anglo-Irish Treaty, the RIC was disbanded in 1922 and was replaced by the Garda Síochána in the Irish Free State and the Royal Ulster Constabulary in Northern Ireland.