| Clastres | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Clastres 02.svg |
| Arrondissement: | Saint-Quentin |
| Canton: | Ribemont |
| Insee: | 02199 |
| Postal Code: | 02440 |
| Mayor: | Jean-Louis Gasdon[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CA Saint-Quentinois |
| Coordinates: | 49.7461°N 3.2328°W |
| Elevation M: | 79 |
| Elevation Min M: | 63 |
| Elevation Max M: | 95 |
| Area Km2: | 8.24 |
Clastres (in French pronounced as /klastʁ/) is a commune in the Aisne department in Hauts-de-France in northern France.