| Trédias | |
| Native Name: | Trediarn |
| Commune Status: | Commune |
| Coordinates: | 48.3583°N -2.2356°W |
| Insee: | 22348 |
| Postal Code: | 22250 |
| Arrondissement: | Saint-Brieuc |
| Canton: | Broons |
| Mayor: | Renaud Le Berre[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CA Lamballe Terre et Mer |
| Elevation Min M: | 37 |
| Elevation Max M: | 111 |
| Area Km2: | 11.01 |
Trédias (in French pronounced as /tʁedja/; ; Gallo: Trédiarn) is a commune in the Côtes-d'Armor department of Brittany in northwestern France.