Penydarren

For Trevithick's Pen-y-darren locomotive, see Richard Trevithick

Penydarren (Welsh:Pen-y-darren) is a community in Merthyr Tydfil County Borough in Wales.

The area is most notable as being the site of a 1st-century Roman fort, and during the Industrial Revolution it housed Penydarren Ironworks the third largest of the great Merthyr works. Penydarren was also used by Richard Trevithick as the location for his experiments into steam locomotion. The community and ward has a population of 5,253, increasing to 5,419 at the 2011 Census.