| Lilhac | |
| Commune Status: | Commune |
| Arrondissement: | Saint-Gaudens |
| Canton: | Cazères |
| Insee: | 31301 |
| Postal Code: | 31230 |
| Mayor: | Gilbert Sioutac[1] |
| Term: | 2020 - 2026 |
| Coordinates: | 43.2858°N 0.81°W |
| Elevation M: | 390 |
| Elevation Min M: | 280 |
| Elevation Max M: | 381 |
| Area Km2: | 7.3 |
Lilhac (in French pronounced as /lijak/) is a commune in the Haute Garonne department in southwestern France.
Local inhabitants are called Lilhacais.
Lilhac lies roughly 65 km southwest from Toulouse. Its altitude at the highest point is 380 metres, and covers an area of 730ha or 7.3 km².
The river Touch has its source in the commune.
Lilhac was registered as a commune in 1668. The local church, Eglise St-Quitterie, dedicated to Saint Quiteria, dates to before the 18th century.