| Quarna Sotto | |
| Official Name: | Comune di Quarna Sotto |
| Coordinates: | 45.8667°N 29°W |
| Region: | Piedmont |
| Province: | Verbano-Cusio-Ossola (VB) |
| Mayor: | Paolo Gromme |
| Area Total Km2: | 16.05 |
| Population Footnotes: | [1] |
| Population Total: | 399 |
| Population As Of: | 31 December 2014 |
| Population Demonym: | Quarnesi |
| Elevation M: | 802 |
| Postal Code: | 28896 |
| Area Code: | 0323 |
Quarna Sotto is a comune (municipality) in the Province of Verbano-Cusio-Ossola in the Italian region Piedmont, located about 100km (100miles) northeast of Turin and about 15km (09miles) southwest of Verbania.
Quarna Sotto borders the following municipalities: Nonio, Omegna, Quarna Sopra, Valstrona, Varallo Sesia.