Metz Cathedral or St. Stephen's Cathedral in Metz (Cathédrale Saint-Étienne de Metz) is a Roman Catholic cathedral in Metz, in the département of Moselle, France. It is the seat of the Bishop of Metz. It was formed in the 14th century by joining together two churches: the nave of Saint-Etienne, built in the 13th century, was attached to the north side of an older Romanesque church. It is sited in the heart of the city, on the Place d'Armes, where it provides a focal point for the city centre.
In the 15th century, a transept and a choir were added. This nave, at 41.41 meters, is the third highest in France. Only Beauvais Cathedral and Amiens Cathedral have higher naves.