| Tourdun | |
| Commune Status: | Commune |
| Arrondissement: | Mirande |
| Canton: | Pardiac-Rivière-Basse |
| Insee: | 32450 |
| Postal Code: | 32230 |
| Mayor: | Patrick Marchesin[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Bastides et vallons du Gers |
| Coordinates: | 43.5478°N 0.1522°W |
| Elevation M: | 160 |
| Elevation Min M: | 141 |
| Elevation Max M: | 240 |
| Area Km2: | 6.95 |
Tourdun (in French pronounced as /tuʁdœ̃/; Occitan (post 1500);: Tordun) is a commune in the Gers department in southwestern France.