| Lias | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Lias (Gers).svg |
| Arrondissement: | Auch |
| Canton: | L'Isle-Jourdain |
| Insee: | 32210 |
| Postal Code: | 32600 |
| Mayor: | Gérard Paul[1] |
| Term: | 2020 - 2026 |
| Coordinates: | 43.5633°N 1.1358°W |
| Elevation M: | 305 |
| Elevation Min M: | 172 |
| Elevation Max M: | 305 |
| Area Km2: | 10.67 |
Lias (in French pronounced as /ljas/; Occitan (post 1500);: Liars) is a commune in the Gers department in southwestern France.