| Chassigny-sous-Dun | |
| Commune Status: | Commune |
| Insee: | 71110 |
| Postal Code: | 71170 |
| Arrondissement: | Charolles |
| Canton: | Chauffailles |
| Mayor: | Marie-Anne Bois[1] |
| Term: | 2020 - 2026 |
| Coordinates: | 46.2397°N 4.295°W |
| Elevation M: | 380 |
| Elevation Min M: | 305 |
| Elevation Max M: | 546 |
| Area Km2: | 13.28 |
Chassigny-sous-Dun (in French pronounced as /ʃasiɲi su dœ̃/) is a commune in the Saône-et-Loire department in the region of Bourgogne-Franche-Comté in eastern France.