St Teilo's Church in Wales High School (Welsh: Ysgol Uwchradd Teilo Sant yr Eglwys yng Nghymru) was opened in September 1966 as an 11-16 school and provides a church school comprehensive education for secondary students living mainly in the eastern half of Cardiff. It is now one of three Voluntary Aided Secondary Schools in the Diocese of Llandaff and serves a much wider geographical and spiritual 'catchment' area; many students come from the Diocese of Monmouth and as far away as Caerphilly. As a Voluntary Aided school, the Local Education Authority maintains it, but the Church through its Governing Body, has considerable spiritual, financial, administrative, and educational duties towards it.