Châtillon-en-Vendelais (French pronunciation: [ʃatijɔ̃ ɑ̃ vɑ̃dlɛ]; Gallo: Balazæ, Breton: Kastellan-Gwennel) is a commune in the Ille-et-Vilaine department of Brittany in northwestern France.

Inhabitants of Châtillon-en-Vendelais are called Châtillonais in French.

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