Blaengarw is situated in Bridgend county, South Wales. It is bordered by Darren Goch to the north, Pontycymer to the south, Nantyffyllon to the west and Mynydd Llangeinwyr (Llangeinwyr Mountain) to the east. Nearby towns and villages include Maesteg, Bridgend, Cymer, Treorchy, Llangeinor, Brynmenyn, Blackmill, Sarn, Aberkenfig, Abergwynfi, Croeserw, Caerau and Dyffryn. Blaengarw is the uppermost village in the Garw river valley (Cwm Garw).