| Classun | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Classun (Landes).svg |
| Arrondissement: | Mont-de-Marsan |
| Canton: | Adour Armagnac |
| Insee: | 40082 |
| Postal Code: | 40320 |
| Mayor: | Jean-Michel Lalanne[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Aire-sur-l'Adour |
| Coordinates: | 43.7117°N -0.4128°W |
| Elevation M: | 140 |
| Elevation Min M: | 76 |
| Elevation Max M: | 154 |
| Area Km2: | 8.82 |
Classun (in French pronounced as /klasœ̃/) is a commune in the Landes department in Nouvelle-Aquitaine in southwestern France.[2]