Treherbert is a village and community situated at the head of the Rhondda Fawr valley in the county borough of Rhondda Cynon Taf, Wales. Historically part of Glamorgan. Treherbert is the upper most community of the Rhondda Fawr and encompasses the districts of Blaencwm, Blaenrhondda, Tynewydd and Pen-yr-englyn.