Église Notre-Dame de l'Assomption de Chantilly, Catholic church in Chantilly, France.

Église Notre-Dame de l'Assomption is a Catholic church in Chantilly with the clean lines and stone construction typical of 17th-century French religious buildings. Its symmetrical facade and restrained decoration are characteristic of the classical style that shaped the town's appearance.

The first parish church of Chantilly was established in 1687 under Henri-Jules de Bourbon-Condé, with architect Jules Hardouin-Mansart overseeing the project. Its creation was part of the broader development that transformed the settlement into an organized town.

The parish was carved out of the territories of Saint-Léonard and Gouvieux, and the church became its centre. On 26 January 1692 the archdeacon Nicolas de Saint-Leu inspected the new building and approved it, noting that the frames intended for paintings were still empty and that there were no baptismal fonts or holy-water stoup. The two galleries flanking the choir already held altars and retables.

The church stands in the centre of Chantilly, in the Oise department of Hauts-de-France, and is the seat of the Sainte-Famille parish. Enter from the street side; the nave, side aisles and choir follow one another in a straight line, with the altar and altarpiece at the far end. The building is a classified historical monument, so parts may be closed during services.

On 26 January 1692 the archdeacon Nicolas de Saint-Leu and the clerk Nicolas Langlois inspected the nearly finished church and approved it. Their report notes that the frames meant for paintings were still empty, that there were no baptismal fonts or holy-water stoup, and that the two galleries flanking the choir held altars and retables.