Llandaff Cathedral, from the north, Wales, 1890's

Llandaff Cathedral s the seat of the Bishop of Llandaff, head of the Church in Wales Diocese of Llandaff. It is situated in the district of Llandaff in the city of Cardiff, the capital of Wales. The current building was constructed in the 12th century over the site of an earlier church. It is dedicated to Saint Peter and Saint Paul, and also to three Welsh saints: Dubricius, Teilo and Oudoceus. It is one of two cathedrals in Cardiff, the other being the Catholic Cardiff Cathedral in the city centre.

During the 18th century, when the Bishop of Llandaff began, for the first time for centuries, to reside in Llandaff, the cathedral was extensively restored, the tower rebuilt and a spire added. Much of the restoration work was completed by local architect John Prichard between 1843 and 1869. A triptych by Dante Gabriel Rossetti was designed for use as a reredos, and new stained glass windows were designed by Sir Edward Burne-Jones and Ford Madox Brown. The office of Dean was separated from that of the Archdeacon of Llandaff in November 1843. The cathedral school which existed from the time of the Elizabethan Bishop Blethyn until about 1700 was re-established by Dean Vaughan in 1880.

On the evening of 2 January 1941 during World War II the cathedral was severely damaged when a landmine was dropped near it during the Cardiff Blitz, blowing the roof off the nave, south aisle and chapter house. The top of the spire also had to be reconstructed and there was also damage to the organ. Of British cathedrals, only Coventry Cathedral was damaged more, during the infamous Coventry Blitz.