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.