The Church of St. Ignatius of Loyola at Campus Martius is a Latin 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, which moved in 1584 to a new larger building and was renamed the Pontifical Gregorian University.

The Baroque or Baroquism is a Western style of architecture, music, dance, painting, sculpture, poetry, and other arts that flourished from the early 17th century until the 1750s. It followed Renaissance art and Mannerism and preceded the Rococo and Neoclassical styles. It was encouraged by the Catholic Church as a means to counter the simplicity and austerity of Protestant architecture, art, and music, though Lutheran Baroque art developed in parts of Europe as well.