| Saint-Oyen | |
| Official Name: | Comune di Saint-Oyen Commune de Saint-Oyen |
| Native Name: | Sent-Oyèn |
| Coordinates: | 45.8167°N 20°W |
| Province: | none |
| Frazioni: | Verraz, Condemine, Flassin, Chavanne, Barasson, Pallais, Véyaz, Éternon, Cerisey |
| Area Total Km2: | 9 |
| Population Total: | 199 |
| Population As Of: | 31 December 2022 |
| Population Demonym: | Saintoyards |
| Elevation M: | 1373 |
| Postal Code: | 11014 |
| Area Code: | 0165 |
Saint-Oyen (in French pronounced as /sɛ̃.t‿ɔjɛ̃/; Valdôtain: Sent-Oyèn) is a village and comune in the Aosta Valley region of north-western Italy.
The village is bounded by Bourg-Saint-Pierre (Switzerland), Etroubles, Gignod and Saint-Rhémy-en-Bosses.
The village is twinned with Saint-Oyens in Switzerland.