51°29′53″N 3°14′53″W / 51.498°N 3.248°W
| Ysgol Gyfun Gymraeg Plasmawr | |
|---|---|
| Location | |
 | |
| , CF5 3PZ | |
| Information | |
| Type | State School |
| Motto | 'Gwinllan a roddwyd' |
| Established | 1998 |
| Head Master | Rhodri Thomas |
| Gender | mixed |
| Age | 11 to 18 |
| Enrolment | 1,156 (2023) |
| Houses | Elái, Taf and Rhymni |
| Colour(s) | Maroon and Black |
| Website | http://www.plasmawr.cardiff.sch.uk |
Ysgol Gyfun Gymraeg Plasmawr is a Welsh-medium comprehensive secondary school in Cardiff. It opened in September 1998 as the second school of its kind in Cardiff. Its buildings had formerly belonged to Waterhall Secondary Modern School and more recently formed Ysgol Gyfun Gymraeg Glantaf's Lower School. The current headteacher is Dr Rhodri Thomas.