Bryn Celynnog Comprehensive School is an 11–18 mixed, English-medium, community secondary school and sixth form in Beddau, Rhondda Cynon Taf, Wales. As of March 2023, it had 1319 on roll which included 185 in the sixth form.

Built as the Beddau Girls School and dated 1928. One of a series of schools with similarities in style by the Glamorgan County Architect, D Pugh Jones. This example is relatively small for a secondary school, perhaps because it was for girls only. Shown on an Ordnance Survey map of 1948 with the same E-shaped plan as today. A dotted line is shown across the rear, perhaps representing a fence which would have bounded a courtyard. It is possible that a rear range was planned but not built.

Redevelopment of the school's facilities took place in 2023-24, with a new gym, fitness suite and dance studio.^{[better source needed]}