| Saint-Martin-sous-Montaigu | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason fr Saint-Martin-sous-Montaigu 71.svg |
| Insee: | 71459 |
| Postal Code: | 71640 |
| Arrondissement: | Chalon-sur-Saône |
| Canton: | Givry |
| Mayor: | Christophe Hannecart[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CA Le Grand Chalon |
| Coordinates: | 46.8172°N 4.7144°W |
| Elevation M: | 230 |
| Elevation Min M: | 214 |
| Elevation Max M: | 397 |
| Area Km2: | 3.65 |
Saint-Martin-sous-Montaigu (in French pronounced as /sɛ̃ maʁtɛ̃ su mɔ̃tɛɡy/) is a commune in the Saône-et-Loire department in the region of Bourgogne-Franche-Comté in eastern France.
The vineyards of Saint-Martin-sous-Montaigu are part of the appellation d'origine contrôlée Mercurey.