The 19th century was marked by many events. On January 10, 1805, Pope Pius VII celebrated Mass in the church. In 1833, Frederic Ozanam, a parishioner of St. Stephen, founded with friends the Society of St. Vincent de Paul. On January 3, 1857, Bishop Marie-Dominique-Auguste Sibour, was assassinated with cries of "Down with the goddesses!" by the priest Jean-Louis Verger, opposed to the dogma of the Immaculate Conception. A plaque at the entrance to the nave marks the grave of the prelate, who was to inaugurate the novena of St. Genevieve.
On August 23, 1997, Pope John Paul II celebrated Mass there during the visit to Paris on the occasion of World Youth Day.