Pentwyn (or Pen-twyn) may refer to the following places in south-east Wales:
Pentwyn, Cardiff, a district of the city of Cardiff Pentwyn (electoral ward) Pentwyn, Caerphilly, a village in the Darran Valley Pen-twyn, Carmarthenshire, a hamlet near Cross Hands Pentwyn, Fochriw, a hamlet in Caerphilly, near Fochriw Pentwyn, Torfaen, a village near Abersychan Pen-twyn, Trinant, a village in Caerphilly, near Trinant Pentwyn Berthlwyd, a village in Merthyr Tydfil, near Treharris Pentwyn Deintyr, village in Merthyr Tydfil Pentwyn-mawr, village in Caerphilly, near Pontllanfraith
See also
Pentwyn, Llanllowell, 16th-century farmhouse in Monmouthshire, Wales Pentwyn, Rockfield, 19th-century house in Monmouthshire