Bryncethin (which means dark hill or dun hill) is a small village and electoral ward in the County Borough of Bridgend, South Wales, located just north of Junction 36 of the M4 Motorway and approximately 3 miles north of the county town of Bridgend. The population of the ward was 1,319 in 2011. Bryncethin is surrounded by the villages of Aberkenfig, Sarn, Tondu, Ynysawdre, and Abergarw, Brynmenyn the last of which stands at the confluence of the River Garw (Afon Garw) with the larger River Ogmore (Ogmore River).