Châteaugiron (French: [ʃɑtoʒiʁɔ̃]; Breton: Kastell-Geron; Gallo: Chaujon) is a commune in the Ille-et-Vilaine department of Brittany in northwestern France.

It extended on 1 January 2017 by merging with the former communes of Saint-Aubin-du-Pavail and Ossé.

[3] Inhabitants of Châteaugiron are called Castelgironnais and Castelgironnaises in French.

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