Ancienne fonderie de canons de Saint-Gervais, Historical cannon foundry in Saint-Gervais, France.

The Ancienne fonderie de canons de Saint-Gervais is a former royal cannon foundry on the Isère at Saint-Gervais. Its buildings are of Rovon cut stone, with two projecting wings and four visible furnaces. A long supply channel feeds an artificial pond that once drove four water wheels; only one paddle wheel, the service buildings, the gatehouse and the main building with its timber roof frame remain.

The first stone was laid on 14 January 1679, and the foundry cast its first iron cannons in 1678 for Louis XIV's navy, on the initiative of Colbert advised by Samuel Dalliès de La Tour. Louis XV bought it in 1731, making it the navy's third cannon foundry after Ruelle and Indret. The rise of the rifled cannon closed it in 1865, and it was partly listed as a monument historique on 13 November 1986.

The site's name comes from the village of Saint-Gervais, and its cannon foundry was one of the first in France to cast iron rather than bronze guns. The numbered legend on the 18th-century plan names the powder magazine and the great charcoal hall, showing how the works were organised. Today the buildings house the Depagne firm, which has occupied them since 1985.

The site lies at the end of the impasse de la Fonderie, in the Port de Saint-Gervais, a hamlet separated from the rest of the commune and about 37 km southwest of Grenoble by road. The buildings stand beside the Isère, which fed the canal and the artificial pond that drove the water wheels. Access is on foot around the former works; the terrain and the surviving structures are uneven.

The Saint-Gervais works cast France's first iron cannons in 1678, a material cheaper than the bronze then used for naval guns. The site was chosen by Samuel Dalliès de La Tour after failed attempts in Burgundy, Franche-Comté and the Nivernais; ore came from Allevard and reached the works by the Isère from Goncelin.