South Cork, formally the Southern division of County Cork, was a parliamentary constituency in Ireland, represented in the Parliament of the United Kingdom. From 1885 to 1922 it returned one Member of Parliament (MP) to the House of Commons of the United Kingdom of Great Britain and Ireland.

Until the 1885 general election the area was part of the County Cork constituency. From 1922, on the establishment of the Irish Free State, it was not represented in the UK Parliament.

This constituency comprised the southern part of County Cork, consisting of the barony of East Carbery, West Division, that part of the barony of Ibane and Barryroe not contained within the constituency of South East Cork, that part of the barony of West Carbery, East Division not contained within the constituency of West Cork, and that part of the barony of East Carbery, East Division contained within the parishes of Ballymoney, Desert, Desertserges, Island, Kilgarriff, Kilnagross and Templebryan.