Kilkeel is a small town, civil parish and townland in County Down, Northern Ireland. It is the southernmost town in Northern Ireland. It lies within the historic barony of Mourne. Kilkeel town is the main fishing port on the Down coast, and its harbour is home to the largest fishing fleet in Northern Ireland. It had a population of 6,633 people at the 2021 census. The town contains the ruins of a 14th-century church and fort, winding streets and terraced shops. It lies just south of the Mourne Mountains.

County Down is one of the six counties of Northern Ireland, one of the nine counties of Ulster and one of the traditional thirty-two counties of Ireland. It covers an area of 961 sq mi (2,490 km2) and has a population of 552,261. It borders County Antrim to the north, the Irish Sea to the east, County Armagh to the west, and County Louth across Carlingford Lough to the southwest.