| Biert | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Biert (Ariège).svg |
| Arrondissement: | Saint-Girons |
| Canton: | Couserans Est |
| Insee: | 09057 |
| Postal Code: | 09320 |
| Mayor: | Gilbert Lazaroo[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Couserans-Pyrénées |
| Coordinates: | 42.8997°N 1.3164°W |
| Elevation M: | 588 |
| Elevation Min M: | 559 |
| Elevation Max M: | 1371 |
| Area Km2: | 23.51 |
Biert (pronounced as /fr/; oc|Bièrt) is a commune in the Ariège department of southwestern France.
Inhabitants of Biert are called Biertois.