| Saint-Ouen-sous-Bailly | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason Saint-Ouen-sous-Bailly.svg |
| Arrondissement: | Dieppe |
| Canton: | Dieppe-2 |
| Insee: | 76630 |
| Postal Code: | 76630 |
| Mayor: | Jean-Marie Beaurain[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CC Falaises du Talou |
| Coordinates: | 49.9053°N 1.2983°W |
| Elevation M: | 50 |
| Elevation Min M: | 41 |
| Elevation Max M: | 154 |
| Area Km2: | 5.32 |
Saint-Ouen-sous-Bailly (pronounced as /fr/,) is a commune in the Seine-Maritime department in the Normandy region in northern France.
A small farming village situated in the Pays de Caux, on the D149 road, some 11miles east of Dieppe.