Langast (French pronunciation: [lɑ̃ɡa]; Breton: Lanwal; Gallo: Langau) is a former commune in the Côtes-d'Armor department of Brittany in northwestern France.

On 1 January 2019, it was merged into the new commune Plouguenast-Langast.

[2] Inhabitants of Langast are called langastiens or langastais in French.

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