St. Mary's Church, Rostock, in German Marienkirche, is the biggest of three town churches found in the Hanseatic city of Rostock, in northern Germany. The other two are St. Peter's (Petrikirche) and St. Nicholas (Nikolaikirche). A fourth, St. James' (Jakobikirche), was heavily damaged during the Second World War and subsequently demolished. St. Mary's was designated in 1265 as the main parish church. Since the Protestant Reformation in 1531, it houses a congregation of the Evangelical Lutheran State Church of Mecklenburg.