right|thumb|Ruins of what is now known as Olderfleet Castle (circa 1860-1883). This structure may have been originally known as Curran Castle.
right|thumb|200px|Olderfleet Castle in 2006
Olderfleet Castle is a four-storey towerhouse, 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 may be a corruption of Ulfrecksfiord (or Ulfried's Fjord), the Viking name for Larne Lough.
Olderfleet Castle is a State Care Historic Monument in the townland of Curran and Drumaliss, in the former Larne Borough Council area, at grid ref: D4133 0166.
History
The original towerhouse was possibly built by the Scoto-Irish Bissett family of Glenarm around 1250, although these remains are actually thought to be those of Curran Castle, a towerhouse built in the sixteenth century. On a 1610 map it was called Coraine Castle.
In 1315 Edward Bruce landed here with his 6000 strong army en route to conquer Ireland, with a welcome from the Bissetts. Queen Elizabeth I considered the castle of such strategic importance that it was seized for the crown and Sir Moyses Hill appointed its governor in 1569.