| Sost | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Sost (65).svg |
| Arrondissement: | Bagnères-de-Bigorre |
| Canton: | La Vallée de la Barousse |
| Insee: | 65431 |
| Postal Code: | 65370 |
| Mayor: | Colette Abadie[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Neste Barousse |
| Coordinates: | 42.93°N 0.5578°W |
| Elevation M: | 736 |
| Elevation Min M: | 710 |
| Elevation Max M: | 1958 |
| Area Km2: | 32.05 |
Sost (in French pronounced as /sɔst/; Occitan (post 1500);: Sòst) is a commune in the Hautes-Pyrénées department in south-western France.