Eardisley Castle was in the village of Eardisley in Herefordshire, England, some 11 km north-east of Hay-on-Wye (). 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 1403 Henry IV ordered the castle to be fortified against attacks by Owain Glyndŵr although by 1374 the castle had already been ruined. The mound and wet ditches are the only traces now remaining.