Cotherstone Castle was in the village of Cotherstone by the River Tees some north-east of Barnard Castle in County Durham, England.
This was a motte and bailey castle built around 1090. In 1200 the wooden building was replaced by a stone building, of which was licensed on 2 March 1201. The remains include an earth mound, a ruined wall fragment and traces of a probable fishpond.
There is no public right of way onto the land the Castle occupied, which is now used for pasture.
See also Castles in Great Britain and Ireland List of castles in England
References Cotherstone Castle Fry, Plantagenet Somerset, The David & Charles Book of Castles, David & Charles, 1980.