The Church of St. Ignatius of Loyola at Campus Martius is a Roman Catholic titular church, of deaconry rank, dedicated to Ignatius of Loyola, the founder of the Society of Jesus, located in Rome, Italy. Built in Baroque style between 1626 and 1650, the church functioned originally as the chapel of the adjacent Roman College, that moved in 1584 to a new larger building and was renamed the Pontifical Gregorian University.