| Le Fief-Sauvin | |
| Arrondissement: | Cholet |
| Canton: | Beaupréau |
| Insee: | 49137 |
| Postal Code: | 49600 |
| Commune: | Montrevault-sur-Èvre |
| Coordinates: | 47.2219°N -1.0403°W |
| Elevation M: | 85 |
| Elevation Min M: | 28 |
| Elevation Max M: | 109 |
| Area Km2: | 30.29 |
| Population: | 1684 |
| Population Date: | 2019 |
| Population Footnotes: | [1] |
| Demonym: | Sauvinois, Sauvinoise Sylvanois, Sylvanoise |
Le Fief-Sauvin (in French pronounced as /lə fjɛf sovɛ̃/) is a former commune in the Maine-et-Loire department in western France.
The river Èvre forms all of the commune's eastern border.
On 15 December 2015, La Boissière-sur-Èvre, Chaudron-en-Mauges, La Chaussaire, Le Fief-Sauvin, Le Fuilet, Montrevault, Le Puiset-Doré, Saint-Pierre-Montlimart, Saint-Quentin-en-Mauges, Saint-Rémy-en-Mauges and La Salle-et-Chapelle-Aubry merged becoming one commune called Montrevault-sur-Èvre.