| Custonaci | |
| Official Name: | Comune di Custonaci |
| Native Name: | Custunaci |
| Coordinates: | 38.0833°N 63°W |
| Province: | (TP) |
| Frazioni: | Assieni, Cornino, Purgatorio, Santa Lucia, Sperone, Baglio Messina, Frassino, Scurati |
| Mayor: | Giuseppe Bica |
| Area Total Km2: | 69.9 |
| Population Footnotes: | [1] |
| Population Total: | 5561 |
| Population As Of: | 31 March 2018 |
| Population Demonym: | Custonacesi, Custonacioti (Sicilian) |
| Elevation M: | 186 |
| Saint: | Holy Mary of Custonaci |
| Day: | Last Wednesday in August |
| Postal Code: | 91015 |
| Area Code: | 0923 |
Custonaci (Sicilian: Custunaci) is a town and comune in the province of Trapani, north-Western Sicily, southern Italy.
The coast around Mount Cofano attracts tourists to the seaside village of Cornino.