| Montestruc-sur-Gers | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Montestruc-sur-Gers (Gers).svg |
| Arrondissement: | Condom |
| Canton: | Fleurance-Lomagne |
| Insee: | 32286 |
| Postal Code: | 32390 |
| Mayor: | Gisèle Gimat[1] |
| Term: | 2022 - 2026 |
| Intercommunality: | Lomagne Gersoise |
| Coordinates: | 43.7936°N 0.6297°W |
| Elevation M: | 102 |
| Elevation Min M: | 91 |
| Elevation Max M: | 180 |
| Area Km2: | 16.31 |
Montestruc-sur-Gers (in French pronounced as /mɔ̃tɛstʁyk syʁ ʒɛʁ(s)/, literally Montestruc on Gers; Occitan (post 1500);: Montastruc) is a commune in the Gers department in southwestern France.