Llangattock (Welsh: Llangatwg) is a village, community and electoral ward in the Brecon Beacons National Park in Powys, Wales.

Some of Britain's longest cave systems lie concealed beneath this hill, including Ogof y Daren Cilau and Ogof Agen Allwedd together with the shorter though more accessible cave of Eglwys Faen (or 'stone church').

The natural amphitheatre formed by the cliffs of Craig y Cilau and the quarried Daren Cilau was designated a national nature reserve on account of a variety of rare plants, notably species of whitebeam endemic to the area.

The hollow itself is thought to be a product of both glacial action and a massive rotational landslip during the ice ages.

It is home to a chapel, and is of archaeological interest due to the 4,000 year old burial ground in the park.

It is a Grade II listed building[5] and its gardens and park are listed at Grade II on the Cadw/ICOMOS Register of Parks and Gardens of Special Historic Interest in Wales.