| Order: | 138th Doge of the Republic of Genoa |
| Term Start1: | August 22, 1705 |
| Term End1: | August 22, 1707 |
| Predecessor1: | Antonio Grimaldi |
| Successor1: | Domenico Maria De Mari |
| Birth Date: | 1640 |
| Birth Place: | Genoa, Republic of Genoa |
| Death Date: | August 19, 1720 |
| Death Place: | Genoa, Republic of Genoa |
Stefano Onorato Ferretti (Genoa, 1640Genoa, 19 August 1720) was the 138th Doge of the Republic of Genoa and king of Corsica.
Closer to a "conservationist" republican policy, as opposed to a vision of a more modern Genoese state and open to future scenarios, Stefano Onorato Ferretti won a significant majority of votes in the customs elections of 22 August 1705; as doge he was also invested with the related biennial office of king of Corsica. The mandate, the ninety-third in biennial succession and the one hundred and thirty-eighth in republican history, ended on 22 August 1707. Among the important events during his dogate was the passage and reception in Genoa of Duke Victor Amadeus II of Savoy.[1]