Châteauneuf-d'Ille-et-Vilaine (French: [ʃɑtonœf dil e vilɛn]; Breton: Kastell-Noez) is a commune in the Ille-et-Vilaine department of Brittany in north-western France.

Inhabitants of Châteauneuf-d'Ille-et-Vilaine are called Castelnoviens in French.

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