| Ventzio | |
| Name Local: | Βέντζιο |
| Type: | municipal unit |
| Periph: | West Macedonia |
| Periphunit: | Grevena |
| Population: | 1370 |
| Population As Of: | 2021 |
| Area: | 323.277 |
| Coordinates: | 40.0833°N 60°W |
| Postal Code: | 511 00 |
| Area Code: | +30-2462 |
| Licence: | PN |
Ventzio (Greek, Modern (1453-);: Βέντζιο) is a municipal unit of the Grevena municipality. Before the 2011 local government reform it was an independent municipality.[1] Ventzio covers an area of 323.277 km2.[2] The seat of the municipality was in Knidi.