| Lerm-et-Musset | |
| Commune Status: | Commune |
| Arrondissement: | Langon |
| Canton: | Le Sud-Gironde |
| Insee: | 33239 |
| Postal Code: | 33840 |
| Mayor: | Martine Lagardere[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Bazadais |
| Coordinates: | 44.3283°N -0.1556°W |
| Elevation M: | 93 |
| Elevation Min M: | 64 |
| Elevation Max M: | 137 |
| Area Km2: | 36.87 |
Lerm-et-Musset (in French pronounced as /lɛʁm e mysɛ/; Occitan (post 1500);: L'Èrm e Musset) is a commune in the Gironde department in Nouvelle-Aquitaine in southwestern France.
Lerm-et-Musset was first mentioned in 782 AD in the domesday book as a strategic crossroads town.