| Piansano | |
| Official Name: | Comune di Piansano |
| Coordinates: | 42.5167°N 60°W |
| Region: | Lazio |
| Province: | Province of Viterbo (VT) |
| Mayor: | Roseo Melaragni (since June 2004 - Second mandate) |
| Area Total Km2: | 26.5 |
| Population Total: | 2232 |
| Population As Of: | 31 December 2004 |
| Population Demonym: | Piansanesi |
| Elevation M: | 409 |
| Saint: | St. Bernardino of Siena |
| Day: | May 20 |
| Postal Code: | 01010 |
| Area Code: | 0761 |
Piansano is a Italian: [[comune]] (municipality) in the Province of Viterbo in the Italian region of Latium, located about 90km (60miles) northwest of Rome and about 25km (16miles) northwest of Viterbo. As of 31 December 2004, it had a population of 2,232 and an area of 26.5km2.[1]
Piansano borders the following municipalities: Arlena di Castro, Capodimonte, Cellere, Tuscania, Valentano.
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