| Boulogne-sur-Gesse | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Boulogne-sur-Gesse (Haute-Garonne).svg |
| Arrondissement: | Saint-Gaudens |
| Canton: | Saint-Gaudens |
| Insee: | 31080 |
| Postal Code: | 31350 |
| Mayor: | Alain Boubée[1] |
| Term: | 2020 - 2026 |
| Coordinates: | 43.2906°N 0.6456°W |
| Elevation M: | 335 |
| Elevation Min M: | 243 |
| Elevation Max M: | 388 |
| Area Km2: | 24.73 |
Boulogne-sur-Gesse (in French pronounced as /bulɔɲ syʁ ʒɛs/, literally Boulogne on Gesse; Occitan (post 1500);: Bolonha de Gessa) is a commune of the Haute-Garonne department in southwestern France.
The river Gesse forms most of the commune's eastern border, while the Gimone forms part of its southwestern and northwestern borders.