| Bailleul-sur-Thérain | |
| Commune Status: | Commune |
| Arrondissement: | Beauvais |
| Canton: | Mouy |
| Insee: | 60041 |
| Postal Code: | 60930 |
| Mayor: | Béatrice Lejeune[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CA Beauvaisis |
| Coordinates: | 49.3861°N 2.2228°W |
| Elevation M: | 59 |
| Elevation Min M: | 46 |
| Elevation Max M: | 138 |
| Area Km2: | 9.5 |
Bailleul-sur-Thérain (pronounced as /fr/, literally Bailleul on Thérain) is a commune in the Oise department in northern France.