St. Michael's Church is a Roman Catholic church in Osijek in Croatia. It is located in Tvrđa. The Jesuits laid the foundation stone on July 31, 1725 on the foundations of the Kasimpaša Mosque, built during the Ottoman period in Osijek. In 1734 the first mass was held in the unfinished church. In 1750 the church was dedicated to Saint Michael. They were completed in 1768. In 1991, during the Croatian War of Independence, the church was damaged, but in 1999 it was renovated.