Lézardrieux (Breton:Lezardrev) is a commune in the Côtes-d'Armor department of Brittany in northwestern France.

The village is situated near the mouth of the estuary of the Trieux river - the suspension bridge (Pont de Lézardrieux) across the river at this point is a French national monument. There is a marina with moorings for several hundred pleasure boats and the tidal range experienced is remarkable.