Erquy (French pronunciation: [ɛʁki]; Breton: Erge-ar-Mor; Gallo: Erqi) is a commune in the Côtes-d'Armor department of Brittany in northwestern France.

Erquy is located in a cove of the Penthièvre coast bordered by cape Erquy on one side and a volcanic rock formation called pointe de la Heussaye on the other. Its harbour shelters a flotilla of about 80 trawlers, earning the town a reputation as the scallop "capital". The shellfish are collected in the Saint-Brieuc bay.

It is a popular summar destination, known for its ten fine sand beaches and pink sandstone houses.

Erquy claims to be the inspiration behind the village of the Asterix comics, which is situated in roughly the same place in ancient Armorica (now Brittany); this would make the villagers likely Coriosolites, a tribe who lived in that area.

Inhabitants of Erquy are called Réginéens or Erquiais in French.

Erquy offers a variety of natural landscapes: pink sandstone cliffs and rocks, wild heathland, pinewoods, beaches, dunes and a transparent emerald sea.

Some coastal paths run along the spectacular pink sandstone cliffs of Cape Erquy and Cape Fréhel, close by. The heathland of Cape Erquy is listed as one of the most remarkable natural environments of the Côtes-d'Armor department. Once used as farmland, it is now a nature reserve. It shelters a wide variety of species of heather and gorse creating a colourful landscape changing with the seasons.

Erquy's ten beaches come in all shapes and sizes: from the small coves bordered by heathland north of the cape to the large expanses of Caroual and Saint-Pabu.