| Fontrieu | |
| Commune Status: | Commune |
| Arrondissement: | Castres |
| Canton: | Les Hautes Terres d'Oc |
| Insee: | 81062 |
| Postal Code: | 81260 |
| Mayor: | Didier Gavalda[1] |
| Term: | 2020 - 2026 |
| Coordinates: | 43.649°N 2.514°W |
| Area Km2: | 102.62 |
Fontrieu (pronounced as /fr/; oc|Fontriu) is a commune in the Tarn department and Occitanie region of southern France. The municipality was established on 1 January 2016 by merger of the former communes of Castelnau-de-Brassac, Ferrières and Le Margnès.[2]