| Mussy-sous-Dun | |
| Commune Status: | Commune |
| Insee: | 71327 |
| Postal Code: | 71170 |
| Arrondissement: | Charolles |
| Canton: | Chauffailles |
| Mayor: | Jean-Pierre Bonin[1] |
| Term: | 2022 - 2026 |
| Coordinates: | 46.235°N 4.3306°W |
| Elevation M: | 410 |
| Elevation Min M: | 338 |
| Elevation Max M: | 705 |
| Area Km2: | 10 |
Mussy-sous-Dun (in French pronounced as /mysi su dœ̃/) is a commune in the Saône-et-Loire department in the region of Bourgogne-Franche-Comté in eastern France.