| Salsein | |
| Commune Status: | Commune |
| Arrondissement: | Saint-Girons |
| Canton: | Couserans Ouest |
| Insee: | 09279 |
| Postal Code: | 09800 |
| Mayor: | Francis Pujol[1] |
| Term: | 2020 - 2026 |
| Coordinates: | 42.9103°N 1.0078°W |
| Elevation M: | 750 |
| Elevation Min M: | 588 |
| Elevation Max M: | 1640 |
| Area Km2: | 5.73 |
Salsein (in French pronounced as /salsɛ̃/; Occitan (post 1500);: Salsenh) is a commune in the Ariège department in the Pyrenees, in southwestern France.
It is located close to Castillon-en-Couserans, about 17 km south-west of Saint-Girons. It is part of the Ariège Pyrenees regional natural park.
The terrain is mountainous. The Bach, Cazalus and Coudères streams run through Salsein.
Inhabitants of Salsein are called Salseinois.