The Protestant St. Stephen's Church (French: Temple Saint-Étienne) is the main Reformed church of the city of Mulhouse in Alsace, France. Its congregation forms part of the Protestant Reformed Church of Alsace and Lorraine. Because of its central location on the main square of Mulhouse, the Place de la Réunion, and its 97 metre high bell tower (the highest steeple in the department of Haut-Rhin), it is sometimes referred to as the "Cathedral of Mulhouse" (Cathédrale de Mulhouse). The church was designed by the city architect Jean-Baptiste Schacre, who also designed the large Catholic St.