Vallons-de-l'Erdre (French pronunciation: [valɔ̃ də lɛʁdʁ] ⓘ; Breton: Saonioù-an-Erzh) is a commune in the department of Loire-Atlantique, western France.

The municipality was established on 1 January 2018 by merger of the former communes of Saint-Mars-la-Jaille (the seat), Bonnœuvre, Freigné (part of the department of Maine-et-Loire before 2018), Maumusson, Saint-Sulpice-des-Landes and Vritz.

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