Llandaff is a district of the city of Cardiff, Wales, and is also the name of a diocese of the Church of England, covering the most populous area of South Wales.

Llandaff is the most prestigious of the Welsh dioceses. Much of its fabric dates fron 13 th Century .  One of its main modern points of interest is the aluminium figure of Christ in Majesty, by Jacob Epstein, which is suspended above the nave.