Narrow Water Castle (Irish: Caisleán an Chaoil; Ulster-Scots: Narra Wattèr) is a famous 16th-century tower house and bawn near Warrenpoint in Northern Ireland. It is beside the A2 road and on the County Down bank of the Clanrye River, which enters Carlingford Lough a mile to the south. Narrow Water Castle was given into state care in 1956. It is a state care historic monument in the townland of Narrow Water, in Newry and Mourne District Council district, at grid ref: J1256 1939.