Coëtlogon (; ; 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.

Toponymy The name Coëtlogon is typically Breton, "koad" meaning "wood" with the lieu-dit "Logon". Inhabitants of Coëtlogon are called Logonais or Coëtlogonnais in French.

See also Communes of the Côtes-d'Armor department

References