| Saint-Derrien | |
| Native Name: | Sant-Derc'hen |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Saint-Derrien (Finistère).svg |
| Coordinates: | 48.5494°N -4.1797°W |
| Elevation Min M: | 39 |
| Elevation Max M: | 107 |
| Insee: | 29244 |
| Postal Code: | 29440 |
| Arrondissement: | Morlaix |
| Canton: | Landivisiau |
| Mayor: | Dominique Pot[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Pays de Landivisiau |
| Area Km2: | 12.28 |
Saint-Derrien (pronounced as /fr/; br|Sant-Derc'hen) is a commune in the Finistère department of Brittany in north-western France.