Painscastle (Welsh: Castell-paen) is a village and community in Powys (formerly Radnorshire), Wales which takes its name from the castle at its heart.

The community also includes the villages and settlements of Rhosgoch, Bryngwyn, Llandeilo Graban and Llanbedr.

The village itself sits in the broad valley of the Bachawy a small left-bank tributary of the River Wye which runs westwards to the south of it.

The castle was rebuilt and in the hands of William de Braose, 4th Lord of Bramber by 1195, subsequently attacked by Rhys ap Gruffudd of Deheubarth and Gwenwynwyn ab Owain of Powys during the late 1190s.

[3] After being briefly in the hands of King John of England it was captured by Gwalter ab Einion Clud in 1215.