Narberth Castle (Welsh: Castell Arberth) is a ruined Norman fortress in the town of Narberth, Pembrokeshire, West Wales. It forms part of the Landsker Line.
A chronicle in the Cotton library mentions that, in 1116, Gruffydd ap Rhys attacked and destroyed the castle of arberth; this however probably refers to the nearby Sentence Castle, the stone castle at Narberth not having been built until over 100 years later.[1]