Llawhaden Castle (Welsh: Castell Llanhuadain) is a castle in the Pembrokeshire village of Llawhaden and 10 miles east of Haverfordwest in southwest Wales, at grid reference SN 073175. A motte-and-bailey castle is thought to have previously occupied the site and the present structure was built by the bishops of the Diocese of St David in the 13th century. The castle was abandoned in the 16th century and some of the stone was removed for local building projects. The site is owned and managed by Cadw.