| Rieussec | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Rieussec 34.svg |
| Arrondissement: | Béziers |
| Canton: | Saint-Pons-de-Thomières |
| Insee: | 34228 |
| Postal Code: | 34220 |
| Mayor: | Alain Mouly[1] |
| Term: | 2020 - 2026 |
| Coordinates: | 43.4181°N 2.74°W |
| Elevation M: | 490 |
| Elevation Min M: | 314 |
| Elevation Max M: | 860 |
| Area Km2: | 22.2 |
Rieussec (in French pronounced as /ʁjøsɛk/;, meaning dry river) is a commune in the Hérault department in the Occitanie region in southern France.
The Thoré has its source in the northern part of the commune.