Sangiano is a comune (municipality) in the Province of Varese in the Italian region Lombardy, located about northwest of Milan and about northwest of Varese. As of 31 December 2004, it had a population of 1,345 and an area of .
Sangiano borders the following municipalities: Besozzo, Caravate, Laveno-Mombello, Leggiuno. In the area of Sangiano there's a limestone rock wall called "falesia del Picuz" prepared for sport climbing with fixed bolts and belays.
The Nobel Prize Winner of Literature in 1997, Dario Fo, was born here.