| Mésanger | |
| Native Name: | (Gallo) |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Mésanger (Loire-Atlantique).svg |
| Arrondissement: | Châteaubriant-Ancenis |
| Canton: | Ancenis-Saint-Géréon |
| Insee: | 44096 |
| Postal Code: | 44522 |
| Mayor: | Nadine You[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Pays d'Ancenis |
| Coordinates: | 47.4339°N -1.2303°W |
| Elevation Min M: | 7 |
| Elevation Max M: | 76 |
| Area Km2: | 49.75 |
Mésanger (in French pronounced as /mezɑ̃ʒe/; Gallo: Mezanjaer, Breton: Mezansker) is a commune in the Loire-Atlantique department in western France.