Le Châtellier (French pronunciation: [lə ʃatəlje] ⓘ; Breton: Kasteller; Gallo: Le Chastelier) is a commune in the Ille-et-Vilaine Department in Brittany in northwestern France.

Inhabitants of Le Châtellier are called Castellérois or Castellégiens in French.

The Botanical garden of Upper Brittany is located in Le Châtellier.

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