Heolgerrig (Welsh for "stony road"; formerly "Pen-yr-Heolgerrig") is a small village in Merthyr Tydfil County Borough, Wales. It is part of the community of Cyfarthfa.
Calfaria Welsh chapel in Heolgerrig, Merthyr Tydfil.
It lies just west of Merthyr Tydfil, and is separated from it by the main A470 trunk road.
Village amenities include the Heolgerrig primary school, The Red Lion pub, The Heolgerrig Social Club, three chapels and a post office and small convenience store.
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