Knockdrum Stone Fort

Knockdrum Stone Fort is a circular stone rath, ringfort, or hilltop fort near Castletownshend in County Cork, Ireland. It was restored before 1860, and there were archaeological excavations from 1930–31. The three-metre thick walls are reported as either 2 metres or 1.75 metres high depending on the source, and as 29 metres in diameter. The site is owned by the Irish Government which has declared it a national monument.

Inside the fort are the stone foundations of a rectangular building with a souterrain, a type of structure characteristic of the European Iron Age, but often of later date in Ireland. There are cup marks both inside and outside the wall.