Pen-y-graig (Welsh for lit. 'Head of the rock') may refer to one of these places in Wales:

• Pen-y-graig (electoral ward), 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

See also

• Penygraigwen, village in Anglesey
• Pencraig, Anglesey, area in Anglesey