Jardin archéologique de Cybèle, Archaeological garden in Vienne, France.

The Jardin archéologique de Cybèle is an outdoor site displaying ruins of a Roman forum in Vienne. The grounds feature remains of arcades, walls, and building foundations dating back to antiquity.

The site preserves three identifiable groups of Gallo-Roman remains: portico arcades bordering the forum, a large-block wall of an open rectangular hall probably used by the municipal assembly, and a residential quarter with houses and terraces. A 48 by 38 metre building south of the forum access square dates to the early 1st century; its north wall later served as a rampart for the Maison-forte des Canaux. Elements were inscribed as monuments historiques in 2012 and classified in 2013.

The forum served as the heart of public life in the Roman city, where commerce and civic gatherings took place. The standing structures show how Romans organized space for community interaction.

The site lies in Vienne, in the Isère department. Parts of the remains are inscribed or classified as monuments historiques (2012 and 2013), so keep to the paths and do not climb on the stones. The garden is open-air and can be visited on foot; allow time to read the remains of the three identifiable groups.

The north wall of a 48 by 38 metre building still stands in large limestone blocks with regular offsets and an outer cornice. In the Middle Ages it was reused as a rampart for the maison-forte des Canaux, against which the town wall leaned.