Noyal-Châtillon-sur-Seiche (French pronunciation: [nwajal ʃatijɔ̃ syʁ sɛʃ]; Gallo: Nóyau-Chastilhon, Breton: Noal-Kastellan) is a commune in the Ille-et-Vilaine department of Brittany in northwestern France.

As the name suggests it is on the Seiche river.

Inhabitants of Noyal-Châtillon-sur-Seiche are called castelnodais in French.

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