Plestin-les-Grèves (French pronunciation: [plɛstɛ̃ le ɡʁɛv]; Breton: Plistin) is a commune in the Côtes-d'Armor department of Brittany in north-western France.

Plestin-les-Grèves is situated on the north coast of Brittany, with a sailing club in Stefflam and Loquirec.

Plestin-les-Grèves is twinned with Launceston in Cornwall, United Kingdom Inhabitants of Plestin-les-Grèves are called in French plestinais.

The municipality launched a linguistic plan through Ya d'ar brezhoneg on 8 March 2006.

This Côtes-d'Armor geographical article is a stub.