| Assainvillers | |
| Commune Status: | Commune |
| Arrondissement: | Montdidier |
| Canton: | Roye |
| Insee: | 80032 |
| Postal Code: | 80500 |
| Mayor: | Xavier Dejaiffe[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CC Grand Roye |
| Coordinates: | 49.6208°N 2.6103°W |
| Elevation M: | 85 |
| Elevation Min M: | 68 |
| Elevation Max M: | 100 |
| Area Km2: | 7.3 |
Assainvillers is a commune in the Somme department in Hauts-de-France in northern France.