Redon (; ) is a commune in the Ille-et-Vilaine department in Brittany in northwestern France. It is a sub-prefecture of the department.
Redon borders the Morbihan and Loire-Atlantique departments.
It is situated at the junction of the Oust and Vilaine rivers and Nantes-Brest canal, which makes it well known for its autumn and winter floods.
It is located at 67 km from Nantes, 70 km from Rennes and 60 km from Vannes.
The town has a station which connects to Quimper and Rennes then Paris in .
Very little information exists about this area before 832; however, it would seem that there was a parish by the name of Riedones which gave the town its name. In 832, Conwoïon, a Breton monk with the help of the Carolingian Emperor Louis the Pious founded the abbey of Saint-Sauveur de Redon. Today, documents relating to life within the abbey still exist.
The town developed around the abbey until a small rural community of 6,000 inhabitants was formed in the 1960s.
In the Middle Ages, Redon benefitted from maritime commerce due to its location on the Vilaine.
Inhabitants of Redon are called Redonnais/Redonnaises in French.
The municipality launched a linguistic plan through Ya d'ar brezhoneg on 10 October 2008.
In 2008, 14.31% of primary-school children attended bilingual schools.
Redon is twinned with: