Llanwrtyd is a small settlement in Powys, mid-Wales, in the historic county of Brecknockshire (Breconshire), through which flows the River Irfon.

[1] The traditional derivation of the name is given in the Reverend Thomas Morgan's Handbook of the Origin of Pace-names in Wales and Monmouthshire.

[3] The parish church of St David dates from the 11th century and is a Grade II* listed building.

[4] Theophilus Jones, in his A History of the County of Brecknock, was fairly disparaging of the parish; when describing the church he states "there is nothing deserving of notice in this miserable fabric, unless it be an inscription on the wall, to the memory of an old woman of the name of Jones."

After the coming of the railway in 1867 the parish played host to at least 12,000 visitors annually to drink the mineral waters at the sulphur springs about a mile and a half down river from the church, and the small town of Llanwrtyd Wells at the springs became the main population centre of the parish.