| Dun | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Dun (Ariège).svg |
| Arrondissement: | Pamiers |
| Canton: | Mirepoix |
| Insee: | 09107 |
| Postal Code: | 09600 |
| Mayor: | Florent Pauly[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Pays de Mirepoix |
| Coordinates: | 43.0283°N 1.7997°W |
| Elevation M: | 331 |
| Elevation Min M: | 303 |
| Elevation Max M: | 648 |
| Area Km2: | 41.41 |
Dun (in French pronounced as /dœ̃/) is a commune in the Ariège department in the Occitanie region in southwestern France. In 1973, the commune Dun was expanded with the former communes Merviel, Engraviès and Senesse-de-Senabugue.[2]