Old St. Mary Church was built in 1847, in Milwaukee, Wisconsin, by the Old St. Mary Parish. The parish was founded a year earlier, by German Catholic immigrants. Milwaukee, having been incorporated only the year before, was still a young city at that time, and Wisconsin had not yet become a state. Old St. Mary's is the oldest church still standing in the city. The church was designed by Victor Schulte, a Prussian immigrant, who designed three other religious buildings in the area.