Église Saint-Louis en l’Ile is a Catholic church from the 17th century, located near Notre Dame Cathedral. It is dedicated to Louis IX, who ruled France from 1226 to 1270 and was canonised at the end of the 13th century by Pope Boniface VIII as St Louis of France.
The church is located at the intersection of the Rue Saint-Louis en l’Ile and the Rue Poulletier. It was constructed in stages from 1624 to 1726. Its patron saint is Saint Louis of France who reigned under the name of Louis IX. The parish is currently one of the smallest of the diocese of Paris. It covers half of the Ile de la Cite, Ile Saint-Louis itself and the ancient Isle Louviers (the part between the existing boulevard Morland and the Seine).