Sketrick Castle is a castle situated on Sketrick Island near Whiterock, County Down, Northern Ireland. The castle is estimated to date back to the 12th century. Sketrick Castle tower-house and the passage to spring are State Care Historic Monuments in the townland of Sketrick Island, in the Ards and North Down Borough, at grid ref: J5245 6252.
The castle dates from the late 12th century. In the 14th century it was acquired by Sir Robert Savage. The Annals of the Four Masters record the capture of the castle in 1470 by an army led by the O'Neill to assist the MacQuillans. They took the castle and it was given to MacQuillan for safe keeping. It was intact until 1896 when a storm demolished much of it.
Sketrick Castle was originally 57 ft high, 51 ft long and 27 ft wide, four storeys high, with a boat bay and a stone subterranean passage discovered in 1957. It had four chambers at ground level, the largest with a vault constructed on wicker centring, as well as two brick-lined recesses, probably ovens. It has lintels running under the bawn wall to a chamber with a corbel over a fresh water spring. Parts of the bawn wall still survive to the north and east of the castle.
- "Sketrick Castle" (PDF). Environment and Heritage Service NI - State Care Historic Monuments. Archived from the original (PDF) on 2012-07-22. Retrieved 2007-12-04.
- "Sketrick Castle". Ulster Scots Heritage Trail. Retrieved 6 March 2015.
- "Sketrick Castle". NI Family History Research Site. Retrieved 6 March 2015.
- "Sketrick Castle". Discover Northern Ireland. Retrieved 6 March 2015.