Conservatoire de patrimoine de Citroën, Automobile museum in Aulnay-sous-Bois, France.

The Citroën Heritage Conservatory is an automobile museum in Aulnay-sous-Bois housing a collection of around 370 vehicles that documents the complete history of the French manufacturer. The institution maintains at least two working examples of every Citroën model produced since 1919.

The museum was founded in 2001 next to the PSA factory, anchoring the site's long industrial past. The collection documents decades of innovation and transformation in French automobile manufacturing.

The collection is organised first by decade, from 1919 to 2000, then by vehicle type: sports, expeditions, vans, rarities, concept cars and prototypes. Among the 370 cars kept in the 6,500 m² building are the Citroën Type A, the brand's first model, and its racing cars. At least two running examples of every model built since the origins are kept.

The conservatory is open to the general public and by appointment, receiving about 4,300 visitors a year; regular tours are organised through the departmental tourism committee. The site is due to move to Poissy, and it closed temporarily on 30 June 2024 for the relocation, so check before travelling. The building covers 6,500 m² next to the former PSA plant at Aulnay-sous-Bois.

The archives were gathered from sites including La Ferté-Vidame, the Rennes and Aulnay-sous-Bois factories, and a basement on rue Vasco-de-Gama in Paris's 15th arrondissement. On 10 December 2017, the 64 duplicate vehicles were auctioned, fetching more than the estimates.