Pennard Castle is a ruined castle, near the modern village of Pennard on the Gower Peninsula, in south Wales. The castle was built in the early 12th century as a timber ringwork following the Norman invasion of Wales. The walls were rebuilt in stone by the Braose family at the turn of the 13th and 14th centuries, including a stone gatehouse. Soon afterwards, however, encroaching sand dunes caused the site to be abandoned and it fell into ruin. Restoration work was carried out during the course of the 20th century and the remains of the castle are now protected under UK law as a Grade II* listed building.