Eardisley Castle was in the village of Eardisley in Herefordshire, England, 11 km north-east of Hay-on-Wye (grid reference SO311491).
This was an 11th-century motte and bailey castle with a moat around the bailey filled by a stream. It is recorded in the Domesday Survey as being held by Robert (probably Robert de Basqueville, father of Ralph de Baskerville) from Roger de Lacy.
In 1263 the castle was in the possession of Robert de Clifford where he imprisoned the Bishop of Hereford, Peter de Aquablanca. From around 1272 the castle was probably the chief residence of the Baskerville family although its ownership changed frequently. The de Bohuns, Earls of Hereford were overlords of Eardisley until 1372 when the earldom of Hereford ceased and it passed to the Crown.
In 1403 Henry IV ordered the castle fortified against attacks by Owain Glyndŵr although by 1374 the castle had already been ruined.
By the 1640s the castle was in the possession of Sir Humphrey Baskerville, a Royalist, and was burnt down to the ground during the Civil War, with only one of the gatehouses escaping ruin. A member of the Baskerville family was still living in this ruin in 1670 in comparable poverty.
The mound and wet ditches are the only traces now remaining. The moat was filled in during the summer of 1972.