The canton of Lanvallay is an administrative division of the Côtes-d'Armor department, northwestern France. It was created at the French canton reorganisation which came into effect in March 2015. Its seat is in Lanvallay.

It consists of the following communes:

Bobital Brusvily Calorguen Les Champs-Géraux Évran Le Hinglé Lanvallay Pleudihen-sur-Rance Plouasne Le Quiou Saint-André-des-Eaux Saint-Carné Saint-Hélen Saint-Judoce Saint-Juvat Tréfumel Trévron

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