Coëtlogon (French pronunciation: [kwɛtlɔɡɔ̃]; Breton: Koedlogon; Gallo: Cotlagon) is a former commune in the Côtes-d'Armor department of Brittany in northwestern France.

On 1 January 2025, it was merged into the commune of Plumieux.

[2] The name Coëtlogon is typically Breton, "koad" meaning "wood" with the lieu-dit "Logon".

Inhabitants of Coëtlogon are called Logonais or Coëtlogonnais in French.

This Côtes-d'Armor geographical article is a stub.