| Montagnac-sur-Auvignon | |
| Commune Status: | Commune |
| Arrondissement: | Nérac |
| Canton: | L'Albret |
| Insee: | 47180 |
| Postal Code: | 47600 |
| Mayor: | Jean-Louis Tolot[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Albret Communauté |
| Coordinates: | 44.1617°N 0.4606°W |
| Elevation M: | 196 |
| Elevation Min M: | 48 |
| Elevation Max M: | 196 |
| Area Km2: | 22.69 |
Montagnac-sur-Auvignon (in French pronounced as /mɔ̃taɲak syʁ oviɲɔ̃/; Occitan (post 1500);: Montanhac d'Auvinhon) is a commune in the Lot-et-Garonne department in south-western France.
The commune is about 17 km south west of Agen and a similar distance east of Barbaste.