Church of St. John of Jerusalem outside the walls - Roman Catholic parish church in the city of Poznan. The original church on this site was built in the late 11th century, making it one of the oldest churches in the city. The epithet "behind the walls" came because the church was located outside the medieval defensive wall Poznan.

The first church was built here in the late 11th century in honor of St. Michael the Archangel, located on the crossroads leading to Syremu and Giechu. The chronicle says that it is May 6, 1170, Prince Mieszko III and Bishop of Poznan established a shelter for pilgrims. In 1187 the church and hospice were transferred to the Order of the Knights Hospitallers, who at the beginning of the 13th century began to build a new church. Built and then the church is the building that we see today. It was one of the first stone churches in Poland, it was naved with a pitched roof. Baroque chapel was built in the eastern part of the church.

After a fire in the late 15th century, the church was rebuilt in the Gothic style. The triptych at the altar was set up in a local workshop in 1520. In 1736, on the south side there was a baroque chapel.

After the start of World War II, the church of St. John of Jerusalem was used as a warehouse, and during the Battle of Poznan in 1945, was badly damaged. Restoration work was completed in 1948.

In 1992 the church was returned to the Order of the Knights Hospitallers, after which there was a center opened outpatient cancer patients.