Plélan-le-Grand (French pronunciation: [plelɑ̃ lə ɡʁɑ̃]; Gallo: Pilelan, Breton: Plelann-Veur) is a commune in the Ille-et-Vilaine department of Brittany in northwestern France.

Inhabitants of Plélan-le-Grand are called Plélanais in French.

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