Saint-Jouan-de-l'Isle (French pronunciation: [sɛ̃ ʒwɑ̃ də lil] ⓘ; Breton: Sant-Yowan-an-Enez) is a commune in the Côtes-d'Armor département of Brittany in northwestern France.

Inhabitants of Saint-Jouan-de-l'Isle are called saint-jouannais in French.

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