Église Notre-Dame de Montesson, Catholic church in Montesson, France.

Église Notre-Dame de Montesson stands on Place de la République in the town centre, a short walk from the château. The church is built of rendered stone under a slate roof, with a single nave, side chapels and a bell tower above the entrance. Inside, visitors can see the nave vaulting and the parish's 19th-century furnishings.

A parish church existed at Montesson by the 12th century; the present building was rebuilt in the 19th century, and the bell tower dates from that campaign. The church is dedicated to Notre-Dame and stands on the site of the older sanctuary, whose stones were partly reused. Montesson remained a rural parish on the plain west of Paris until the 20th century.

The parish bears the name Notre-Dame, and the church is the starting point of the processions that cross Montesson on the feast of the Assumption in mid-August. Statues of the Virgin are carried through the streets, and the route ends with a blessing on the parvis.

The church is accessible to visitors, especially on weekends and religious holidays when services take place. The parish office can provide information about mass times and other events held at the location.

The church houses a 19th-century painting of the Assumption that was restored by local volunteers; visitors can see it above the side altar. The building also retains its original baptismal font, carved from local stone, which has served generations of Montesson families.