| Cos | |
| Commune Status: | Commune |
| Arrondissement: | Foix |
| Canton: | Foix |
| Insee: | 09099 |
| Postal Code: | 09000 |
| Mayor: | Marie-Christine Dubuc[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CA Pays Foix-Varilhes |
| Coordinates: | 42.9786°N 1.5703°W |
| Elevation M: | 480 |
| Elevation Min M: | 440 |
| Elevation Max M: | 720 |
| Area Km2: | 6.4 |
Cos (in French pronounced as /kɔs/; Occitan (post 1500);: Còs) is a commune in the Ariège department in southwestern France.
On average, Cos experiences 42.5 days per year with a minimum temperature below 0C, 0.1 days per year with a minimum temperature below -10C, 2.5 days per year with a maximum temperature below 0C, and 18.3 days per year with a maximum temperature above 30C. The record high temperature was 37.6C on 12 August 2022, while the record low temperature was -14.7C on 9 February 2012.