| Onano | |
| Official Name: | Comune di Onano |
| Coordinates: | 42.6833°N 60°W |
| Region: | Lazio |
| Province: | Viterbo (VT) |
| Mayor: | Giovanni Giuliani |
| Area Total Km2: | 24.51 |
| Population Footnotes: | [1] |
| Population Total: | 990 |
| Population As Of: | 31 December 2017 |
| Population Demonym: | Onanesi |
| Elevation M: | 510 |
| Postal Code: | 01010 |
| Area Code: | 0763 |
Onano is a comune (municipality) in the Province of Viterbo in the Italian region Lazio, located about 100km (100miles) northwest of Rome and about 40km (30miles) northwest of Viterbo.
Onano borders the following municipalities: Acquapendente, Gradoli, Grotte di Castro, Latera, Sorano. Alongside Ala, Ateleta, Orero and Siris, it is one of five Italian municipalities with a palindromic name.