| Démuin | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Démuin 80.svg |
| Arrondissement: | Montdidier |
| Canton: | Moreuil |
| Insee: | 80237 |
| Postal Code: | 80110 |
| Mayor: | Alain Dovergne[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CC Avre Luce Noye |
| Coordinates: | 49.8208°N 2.5375°W |
| Elevation M: | 60 |
| Elevation Min M: | 40 |
| Elevation Max M: | 104 |
| Area Km2: | 11.23 |
Démuin (in French pronounced as /demɥɛ̃/) is a commune in the Somme department in Hauts-de-France in northern France.
The commune is situated on the D23 road, some 14miles southeast of Amiens.