Saint-Lunaire (French pronunciation: [sɛ̃ lynɛʁ]; Breton: Sant-Luner) is a commune in the Ille-et-Vilaine department in Brittany in northwestern France.

Evidence of neolithic settlement remains in the form of a stone path (dolmen) (2000–5000 BC) at Plate-Roche.

The legend states that the inhabitants of a hamlet on the eastern edge of this area tried to maintain their independence by denying that they had heard the bell.

When Victor Hugo visited the area with Juliette Drouet, he might well have visited the little fishing port whilst preparing his novel on local fishermen, Toilers of the Sea(1866) - in which a murder is committed at the end of Saint-Lunaire's Decolle promontory.

The local population grew with the development of Saint-Malo's fishing industry, particularly in the waters off Newfoundland.

A model ship hanging from the ceiling of the new church serves as a reminder of Saint-Lunaire's many sailors.

Speculators later erected the sea front on the main beach and the Grand Hotel with its casino.