Llandaff Cathedral (Welsh: Eglwys Gadeiriol Llandaf) is a Church in Wales cathedral and parish church in LlandaffCardiff, Wales. It was built in the 12th-century on the site of an earlier church.

It is dedicated tSaint Peter and Saint Paul, and threWelsh saints: Dubricius (Welsh: Dyfrig), Teilo and Oudoceus (Welsh: Euddogwy).