Pen-y-graig may refer to one of these places in Wales:Pen-y-graig, electoral ward in Rhondda Cynon Taf Penygraig, village and community in Rhondda Cynon Taf Pen-y-graig, Carmarthenshire, area of Llanelli, Carmarthenshire Pen-y-graig, Gwynedd, village in Gwynedd Pen-y-graig-goch, SSSI in Carmarthenshire Creigiau Pen y Graig, SSSI in Ceredigion Ffridd Pen-y-Graig, hill in Powys Pen-y-Graig-fawr, hill in Powys Mynydd Pen-y-graig, hill in Rhondda Cynon Taf