Llandaff Cathedral is an Anglican cathedral located in the suburb of Llandaff, Cardiff, Wales. The cathedral dates back to the 12th century and is dedicated to Saint Peter and Saint Paul.

The cathedral has undergone several renovations throughout its history, including rebuilding in the 13th and 15th centuries and a major restoration in the 19th century. The cathedral's architectural style is mainly Gothic, with elements of Romanesque and Victorian Gothic Revival.

Some notable features of the cathedral include the medieval stained glass windows, the Gothic choir screen, and the 15th-century sedilia, a stone seat for the clergy during services. The cathedral also has a number of chapels, including the St. Teilo Chapel and the Lady Chapel, which contains a 16th-century altar screen and a memorial to the Welsh poet Dylan Thomas.

Llandaff Cathedral is also famous for its bell tower, which contains eight bells that are rung regularly for services and special occasions. The cathedral is also home to a choir of men and boys, who perform at services throughout the year.

Today, Llandaff Cathedral is a popular tourist attraction and a significant part of Cardiff's cultural and religious heritage.