| Casto | |
| Official Name: | Comune di Casto |
| Native Name: | Cast |
| Coordinates: | 45.7°N 29°W |
| Province: | (BS) |
| Frazioni: | Alone, Auro, Briale, Comero, Famea, Malpaga |
| Area Total Km2: | 21 |
| Population Footnotes: | [1] |
| Population Total: | 1894 |
| Population As Of: | 2011 |
| Population Demonym: | Castesi |
| Elevation M: | 417 |
| Saint: | S.Antonio Abate |
| Postal Code: | 25070 |
| Area Code: | 0365 |
Casto (Brescian: Cast) is a comune in the province of Brescia, in Lombardy.