| Montségur-sur-Lauzon | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Montségur-sur-Lauzon (Drôme).svg |
| Arrondissement: | Nyons |
| Canton: | Grignan |
| Insee: | 26211 |
| Postal Code: | 26130 |
| Mayor: | Yves Feydy[1] |
| Term: | 2020 - 2026 |
| Coordinates: | 44.3614°N 4.8603°W |
| Elevation Min M: | 112 |
| Elevation Max M: | 297 |
| Area Km2: | 18.24 |
Montségur-sur-Lauzon (pronounced as /fr/; oc|Montsegur) is a commune in the Drôme department in southeastern France.