51°25′23″N 3°14′24″W / 51.423°N 3.240°W / 51.423; -3.240 St Richard Gwyn Catholic High School is a Roman Catholic comprehensive secondary school in Vale of Glamorgan, Wales.

It is named after the Welsh martyr St. Richard Gwyn. It is co-educational, and educates boys and girls from 11 to 16 years. Pupils wishing to study at Sixth Form usually attend St David's Catholic College .

Its feeder schools include St Helen's Primary School, Barry, and St Joseph's Primary School, Penarth.

The school was originally named St Cadoc's^[1] until the name was changed in 1987. The school also moved from Coldbrook Road, Dinas Powys, to Argae Lane, Vale of Glamorgan.

As of 2005, enrolment was 548, a school record, and further growth was projected. Demand for places had exceeded supply in every year since 2000.^[2][3]

The governing body has around 21 governors, some from the Archdiocese of Cardiff.