The canton of Questembert 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 Questembert.

It consists of the following communes:

Berric Caden Le Cours Elven Larré Lauzach Limerzel Malansac Molac Pluherlin Questembert Rochefort-en-Terre Saint-Gravé Sulniac Trédion La Vraie-Croix

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