Olderfleet Castle is a four-storey tower house, the remains of which stand on Curran Point to the south of Larne harbour in Larne, County Antrim, Northern Ireland. The place name of Olderfleet is a corruption of Ulfrecksfiord the Viking name.
Olderfleet Castle is a State Care Historic Monument in the townland of Curran and Drumaliss, in Larne Borough Council area, at grid ref: D4133 0166.