Ysgol Dyffryn Conwy is a bilingual co-educational comprehensive school in the town of Llanrwst in Conwy County Borough, North Wales. The school serves the community of Llanrwst and the many surrounding villages including the rural districts of Betws-y-Coed, Llangernyw and Cerrigydrudion. There are around 800 pupils currently enrolled in the school (783 at the last inspection, including 116 in the sixth form) and most of them are bilingual. The school has recently been moved onto one expanded site which had originally housed years 7-9 only. The site of the upper school (the oldest building and site of the original grammar school) is currently empty, and is being developed into an NHS centre.
The current headmaster of the school is Paul Matthews-Jones. The deputy heads are Mrs Janet Hughes and Mr John Lloyd Roberts.
The school was founded as Llanrwst Grammar School in 1610 by Sir John Wynn, which was situated in the building of the 'upper school'. In 1960 it was renamed Ysgol Dyffryn Conwy (Conwy Valley School) to reflect the fact that the school served the wider Conwy Valley. In February 2005 the pupils were all moved to the Sodexo-owned site on Nebo Road.