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.