The canton of Guer is an administrative division of the Morbihan department, northwestern France. Its borders were modified at the French canton reorganisation which came into effect in March 2015. Its seat is in Guer.

It consists of the following communes:

Allaire Augan Béganne Beignon Carentoir Cournon Les Fougerêts La Gacilly Guer Monteneuf Peillac Porcaro Réminiac Rieux Saint-Gorgon Saint-Jacut-les-Pins Saint-Jean-la-Poterie Saint-Malo-de-Beignon Saint-Martin-sur-Oust Saint-Perreux Saint-Vincent-sur-Oust Théhillac Tréal

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