| Coëtmieux | |
| Native Name: | Koedmaeg |
| Commune Status: | Commune |
| Image Coat Of Arms: | COA fr Coëtmieux 22.svg |
| Coordinates: | 48.4925°N -2.5992°W |
| Insee: | 22044 |
| Postal Code: | 22400 |
| Arrondissement: | Saint-Brieuc |
| Canton: | Lamballe-Armor |
| Mayor: | Dominique Tirel[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CA Lamballe Terre et Mer |
| Elevation Min M: | 32 |
| Elevation Max M: | 83 |
| Area Km2: | 8.02 |
Coëtmieux (in French pronounced as /kwɛtmjø/; ; Gallo: Coétmioec) is a commune in the Côtes-d'Armor department of Brittany in northwestern France.
Inhabitants of Coëtmieux are called Coëtmieusiens in French.