Blain (French pronunciation: [blɛ̃] ⓘ; Gallo: Blaen, Blin or Byein, Breton: Blaen) is a commune in the Loire-Atlantique department in western France.

The commune includes the small town of Blain and the villages of Saint-Émilien-de-Blain and La Chaussée.

Blain is twinned with the market town of Royal Wootton Bassett, England.

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