| Fronsac | |
| Commune Status: | Commune |
| Arrondissement: | Saint-Gaudens |
| Canton: | Bagnères-de-Luchon |
| Insee: | 31199 |
| Postal Code: | 31440 |
| Mayor: | Michel Ladevèze[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Pyrénées Haut Garonnaises |
| Coordinates: | 42.9531°N 0.65°W |
| Elevation M: | 470 |
| Elevation Min M: | 461 |
| Elevation Max M: | 1680 |
| Area Km2: | 4.15 |
Fronsac (in French pronounced as /fʁɔ̃sak/) is a commune in the Haute-Garonne department in southwestern France.
It is situated on the former Route nationale 618, the "Route of the Pyrenees".