| Trelins | |
| Commune Status: | Commune |
| Arrondissement: | Montbrison |
| Canton: | Boën-sur-Lignon |
| Insee: | 42313 |
| Postal Code: | 42130 |
| Mayor: | Alexandre Palmier[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Loire Forez Agglomération |
| Coordinates: | 45.7317°N 4.0086°W |
| Elevation M: | 415 |
| Elevation Min M: | 368 |
| Elevation Max M: | 736 |
| Area Km2: | 8.09 |
Trelins is a commune in the Loire department, Auvergne-Rhône-Alpes region, central France.
The river Lignon du Forez flows through the commune.