Llangammarch Wells, or simply Llangammarch (Welsh: Llangamarch ⓘ), is a village and community in Powys, Wales, lying on the Afon Irfon, and in the historic county of Brecknockshire (Breconshire).

The old village is centred on the parish church of St Cadmarch, which is a grade II* listed building.

Llangammarch Wells Golf Club (now defunct) was founded in 1904.

[3] The community includes the small settlements of Tirabad and Cefn Gorwydd, birthplace of John Penry (1563 – 29 May 1593) the martyr, who was born at Cefn Brith farm.

[citation needed] For elections to Powys County Council, Llangamarch is covered by the Llanwrtyd Wells electoral ward.