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Llanerfyl
St Erfyl's church, Llanerfyl
Llanerfyl Location within Powys
Population	406 (2011)
OS grid reference	SJ041130
Community	Llanerfyl [1]
Principal area	Powys
Preserved county	Powys
Country	Wales
Sovereign state	United Kingdom
Post town	WELSHPOOL
Postcode district	SY21
Dialling code	01938
Police	Dyfed-Powys
Fire	Mid and West Wales
Ambulance	Welsh
UK Parliament	Montgomeryshire
Senedd Cymru – Welsh Parliament	Montgomeryshire
List of places UK Wales Powys 52°40′31″N 3°25′12″W / 52.6752415°N 3.419930°W / 52.6752415; -3.419930

Llanerfyl is a village and community in Montgomeryshire, Powys, Wales. Located near the River Banwy, the community includes the village of Llanerfyl, several farms and wide tracts of marchland. The southern part of the community includes Cwm Nant yr Eira, which suffered severe depopulation in the 20th century.^[2] The 2001 census gives the population of the community as 402, increasing slightly to 406 at the 2011 Census.^[3]

The village contains St Erfyl's church, named after Erfyl, rebuilt in 1870. It contains the remnants of a 15th-century shrine. The circular churchyard has in it a gravestone from either the 5th or 6th century commemorating the death of a young girl, identified locally with Erfyl:

   HIC [IN] / TUM(V)LO IAC/IT R[O]STE/ECE FILIA PA/TERNINI / AN(N)IS XIII IN / PA(CE)
   ('In the grave here lies *Rhostege daughter of Padarn, 13 years, in peace').

• Sir Charles Robert Harington, FRS, (1897–1972), a chemist, synthesised thyroxine.
• Nick Griffin (born 1959), British National Party MEP 2009–2014.
• Siân James (born 1961), a Welsh traditional folk singer and harpist