| Saint-Donan | |
| Native Name: | Sant-Donan |
| Commune Status: | Commune |
| Coordinates: | 48.4706°N -2.8836°W |
| Insee: | 22287 |
| Postal Code: | 22800 |
| Arrondissement: | Saint-Brieuc |
| Canton: | Ploufragan |
| Mayor: | Michel Petra[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Saint-Brieuc Armor |
| Elevation Min M: | 87 |
| Elevation Max M: | 227 |
| Area Km2: | 22.92 |
Saint-Donan (in French pronounced as /sɛ̃ dɔnɑ̃/; Breton: Sant-Donan) is a commune in the Côtes-d'Armor department of Brittany in northwestern France.
Inhabitants of Saint-Donan are called donanais in French.