Vern-sur-Seiche (French pronunciation: [vɛʁn syʁ sɛʃ]; Breton: Gwern-ar-Sec'h; Gallo: Vèrn) is a commune in the Ille-et-Vilaine department in Brittany in northwestern France.

Inhabitants of Vern-sur-Seiche are called Vernois and Vernoises in French.

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