Église Saint-Fiacre-et-Notre-Dame-de-la-Nativité de Livilliers, Gothic church in Livilliers, France.

Église Saint-Fiacre-et-Notre-Dame-de-la-Nativité has a square tower topped by a steep dark grey slate spire, with a clock face on one side. Below and to the right, a gabled section with a red terracotta tile roof holds two tall pointed-arch windows; lower light-stone sections with small arched windows and a rounded turret under a conical roof stand to the left. The nave has a three-level elevation with a false triforium above the great arcades.

The building started as a chapel in Livilliers that was given to Saint-Martin Abbey of Pontoise before 1150, placing it under their care. In 1175 it gained the status of a parish church and has served as the religious center of the community since then.

The church is dedicated to the Nativity of Mary, with Saint Fiacre of Meaux as secondary patron, chosen because market gardening was an important activity in Livilliers. Under the Ancien Régime it belonged to the deanery of Pontoise and the archdiocese of Rouen, and the abbot of Saint-Martin de Pontoise appointed its curate.

The church stands at the south of the village, at a crossroads where five streets meet; the RD 79 now passes along its south side, and a pedestrian parvis was laid out in front of the west facade after 1990. The building reopened on 23 January 2020 after restoration campaigns between 2017 and late 2019, but the parish of Pontoise has not resumed regular services there.

The building contains a rare false triforium above the main arcades, an architectural feature rarely found in the region. This design was normally reserved for larger and more important churches, making this smaller one quite distinctive.