| Montbert | |
| Native Name: | (Gallo) |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Montbert (Loire-Atlantique).svg |
| Arrondissement: | Nantes |
| Canton: | Saint-Philbert-de-Grand-Lieu |
| Insee: | 44102 |
| Postal Code: | 44140 |
| Mayor: | Jean-Jacques Mirallié[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Grand Lieu |
| Coordinates: | 47.0586°N -1.4878°W |
| Elevation Min M: | 7 |
| Elevation Max M: | 51 |
| Area Km2: | 28.24 |
Montbert (in French pronounced as /mɔ̃bɛʁ/; Gallo: Montebèrt, Breton: Monteverzh) is a commune in the Loire-Atlantique department in western France. In 1954 it ceded part of its territory to the new commune of Geneston.