Availles-sur-Seiche (French pronunciation: [avaj syʁ sɛʃ]; Breton: Avallod-ar-Sec'h; Gallo: Avaylh) is a commune in the Ille-et-Vilaine department, in Brittany, in northwestern France.

Inhabitants of Availles-sur-Seiche are called Availlais in French.

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