| Mosnac | |
| Commune Status: | Commune |
| Arrondissement: | Jonzac |
| Canton: | Pons |
| Insee: | 17250 |
| Postal Code: | 17240 |
| Mayor: | Didier Gervreau[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Haute-Saintonge |
| Coordinates: | 45.5064°N -0.5219°W |
| Elevation Min M: | 17 |
| Elevation Max M: | 39 |
| Area Km2: | 12.44 |
Mosnac (in French pronounced as /monak/) is a commune in the Charente-Maritime department in southwestern France.
The village lies on the left bank of the Seugne, which forms all of the commune's northeastern border.