| Siano | |
| Official Name: | Comune di Siano |
| Coordinates: | 40.8025°N 14.6944°W |
| Province: | (SA) |
| Area Total Km2: | 8.47 |
| Population Footnotes: | [1] |
| Population Total: | 10354 |
| Population As Of: | 1 April 2009 |
| Population Demonym: | Sianesi |
| Elevation M: | 126 |
| Saint: | San Rocco |
| Day: | 16 August |
| Postal Code: | 84088 |
| Area Code: | 081 |
| Istat: | 065142 |
Siano is a town and comune in the province of Salerno in the Campania region of south-western Italy.
The municipality has its borders with Bracigliano, Castel San Giorgio, Mercato San Severino, Quindici (AV) and Sarno.