La Bosse-de-Bretagne (French pronunciation: [la bɔs də bʁətaɲ]; Breton: Bosenn; Gallo: La Bocz) is a commune in the Ille-et-Vilaine department in Brittany in northwestern France.

The river Semnon forms most of the commune's southern border.

Inhabitants of La Bosse-de-Bretagne are called Bosséens in French.

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