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

It consists of the following communes:

Aron La Bazoge-Montpinçon Belgeard Champéon La Chapelle-au-Riboul Charchigné Commer Grazay La Haie-Traversaine Hardanges Le Horps Le Housseau-Brétignolles Jublains Lassay-les-Châteaux Marcillé-la-Ville Martigné-sur-Mayenne Montreuil-Poulay Moulay Rennes-en-Grenouilles Le Ribay Sainte-Marie-du-Bois Saint-Fraimbault-de-Prières Saint-Julien-du-Terroux Thubœuf

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