| Flassan | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Flassan (Vaucluse).svg |
| Arrondissement: | Carpentras |
| Canton: | Pernes-les-Fontaines |
| Insee: | 84046 |
| Postal Code: | 84410 |
| Mayor: | Michel Jouve[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CA Ventoux-Comtat Venaissin |
| Coordinates: | 44.0997°N 5.2425°W |
| Elevation M: | 437 |
| Elevation Min M: | 337 |
| Elevation Max M: | 1058 |
| Area Km2: | 20.6 |
Flassan (in French pronounced as /flasɑ̃/; Occitan (post 1500);: Flaçan) is a commune in the Vaucluse department in the Provence-Alpes-Côte d'Azur region in southeastern France.
Flassan is located at the foot of Mont Ventoux.