| Coëtlogon | |
| Native Name: | Koedlogon |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Coëtlogon (CôtesArmor).svg |
| Coordinates: | 48.1425°N -2.5428°W |
| Insee: | 22043 |
| Postal Code: | 22210 |
| Arrondissement: | Saint-Brieuc |
| Canton: | Loudéac |
| Mayor: | Annie Robert[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Loudéac Communauté - Bretagne Centre |
| Elevation Min M: | 77 |
| Elevation Max M: | 182 |
| Area Km2: | 16.35 |
Coëtlogon (pronounced as /fr/; br|Koedlogon; Gallo: Cotlagon) is a commune in the Côtes-d'Armor department of Brittany in northwestern France.
The name Coëtlogon is typically Breton, "koad" meaning "wood" with the lieu-dit "Logon".
Inhabitants of Coëtlogon are called Logonais or Coëtlogonnais in French.