The canton of Plestin-les-Grèves is an administrative division of the Côtes-d'Armor department, northwestern France. Its borders were modified at the French canton reorganisation which came into effect in March 2015. Its seat is in Plestin-les-Grèves.
It consists of the following communes:
Coordinates: 48°40′N 3°38′W / 48.66°N 3.63°W