| Deuillet | |
| Commune Status: | Commune |
| Arrondissement: | Laon |
| Canton: | Tergnier |
| Insee: | 02262 |
| Postal Code: | 02700 |
| Mayor: | Bernard Mahu[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CA Chauny Tergnier La Fère |
| Coordinates: | 49.6308°N 3.3622°W |
| Elevation M: | 60 |
| Elevation Min M: | 46 |
| Elevation Max M: | 97 |
| Area Km2: | 3.76 |
Deuillet (pronounced as /fr/) is a commune in the Aisne department in Hauts-de-France in northern France.