Saint-Nicolas-du-Chardonnet is a Roman Catholic church in the Centre of Paris, France located in the 5th arrondissement. In 1977 it was occupied by traditionalist Society of St. Pius X and remains in the Society's possession to this day.
It is now the society's only church in the city of Paris itself (others exist in the Île de France) and although it is not their official French headquarters. it is seen as their de facto national centre. On Sundays, mass is celebrated in the church at 8.00, 9.00, and 10.30 a.m., and at 12.15 and 6.30 p.m.