| St. Cenydd School | |
| Motto: | 'Aspire & Achieve' |
| Type: | Community School |
| Head Label: | Headteacher |
| Head: | Rebecca Collins |
| Chair Label: | Chair of Governors |
| Chair: | Robert Forester |
| Address: | St. Cenydd School Road |
| City: | Trecenydd |
| County: | Caerphilly |
| Postcode: | CF83 2RP |
| Country: | Wales |
| Local Authority: | Caerphilly |
| Gender: | Co-educational |
| Lower Age: | 11 |
| Upper Age: | 18 |
St. Cenydd School is located in Caerphilly, South Wales. Situated in extensive grounds, with panoramic views of the semi-rural Caerphilly basin, St. Cenydd is a popular, mixed, 11-18 community school of over 1,100 pupils.
St Cenydd Year 11 Rugby squad won the Caerphilly county rugby cup in the 2014–2015 season by defeating local rivals St Martin's comprehensive. It was a hotly contested match with St Cenydd holding onto their lead to win the cup. George Gasson a former pupil at St Cenydd, is now playing rugby at a high level. He has even been selected in the U-18s and U-20s squad for wales. He currently plays for Newport Gwent Dragons.
Thomas Payne completed a 5 km run in under 30 minutes on his park run debut.
St. Cenydd is the designated centre for hearing impaired, physically disabled, and speech and language pupils within the area, with facilities for both special-needs and able-bodied students.