Vieux-Vy-sur-Couesnon (French pronunciation: [vjø vi syʁ kwenɔ̃], literally Vieux-Vy on Couesnon; Breton: Henwig-ar-C'houenon; Gallo: Vioez-Vic) is a commune in the Ille-et-Vilaine department in Brittany in northwestern France.

Vieux-Vy-sur-Couesnon is located on the Couesnon River 33 km northeast of Rennes and 35 km (22 mi) south of Mont Saint-Michel.

The neighboring communes are Romazy, Chauvigné, Saint-Christophe-de-Valains, Saint-Ouen-des-Alleux, Mézières-sur-Couesnon, Gahard, and Sens-de-Bretagne.

The name Vieux-Vy-sur-Couesnon probably comes from the Latin Vetus Victus, "old market town." The settlement has had this name since at least 1063.

Industries:

• Silver-lead ore was mined in the 19th century at a place called Brais. The mine was closed in 1956.
• A granite quarry is still in operation in the northeast, not far from the former mine site.

Inhabitants of Vieux-Vy-sur-Couesnon are called Vieuxviciens in French.

Historical population

Year	Pop.	±%
1962	1,023	—
1968	941	−8.0%
1975	928	−1.4%
1982	835	−10.0%
1990	863	+3.4%
1999	861	−0.2%
2009	1,095	+27.2%

The village is served by just one bus route, the Rennes/Antrain line.

• The Saint-Germain church, most of which dates from the seventeenth century, although certain parts date from the eleventh century. The organ was installed in 1883.
• The Chateau of Moulinet, dating from the nineteenth century.
• The Grotto of Brais (dedicated to the Virgin Mary).
• Within the village boundaries there are seven watermills on the Couesnon river. These are mainly paper mills.
• The cyclopean Wall of Orange (from the Iron Age).
• A trough-shaped granite sarcophagus, first mentioned in 1020, located at the door to the church.

• Communes of the Ille-et-Vilaine department

All these links are in French.

• Official website
• Présentation de la commune de Vieux-Vy-sur-Couesnon, Patrimoine Bretagne