Abbaye de Toussaint de Châlons, Historical abbey in Châlons-en-Champagne, France.

The abbey is a classified historical monument in Châlons-en-Champagne with notable architectural elements from the 16th century. The facades and roofing display the craftsmanship of the period, while interior spaces preserve features from different building styles.

The site's origins trace back to early Christian times, with written mention as a Saint-Sulpice church in the 5th century. Two major fires in the 14th century caused significant damage, but later rebuilding shaped the structure that stands today.

The name Toussaint refers to All Saints, from the former ban de Toussaints on the island enclosed by arms of the Marne. From 1672 the Dames-Régentes, or Nouvelles Catholiques, housed converted Protestant women and girls there; the congregation was dispersed in 1789. The buildings later held the Royal Artillery School from 1790 to 1803, then the Arts et Métiers students from 1806, and from 1861 the departmental teacher-training school.

The former abbey stands between the place de l'École-des-Arts-et-Métiers and the quai des Gadz'Arts, on the site of an island in the Marne. It has been private property since 2006, converted into housing, so there is no interior visit. The stone facades, the mansard roof and the carved arched entrance can be seen from the public street.

The abbey stood on an island in the Marne, in a district called the ban de Toussaints or ban de l'île. The south arm of the river was filled in 1567 to form the rue Saint-Dominique, so the island became solid ground. The first courtyard held a facade attributed to the hôtel Ribault, first mentioned in 1383.