St Thomas' Church (French: Église Saint-Thomas, German: Thomaskirche) is a historical building in Strasbourg, eastern France. It is the main Lutheran church of the city since its cathedral became Catholic again after the annexation of the town by France in 1681. It is nicknamed the "Protestant Cathedral" (la cathédrale du Protestantisme alsacien, Kathedrale der Protestanten) or the Old Lady (Die alte Dame), and the only example of a hall church in the Alsace region. The building is located on the Route Romane d'Alsace. It is classified as a Monument historique by the French Ministry of Culture since 1862. Its congregation forms part of the Protestant Church of Augsburg Confession of Alsace and Lorraine.