| Cazzago San Martino | |
| Official Name: | Comune di Cazzago San Martino |
| Native Name: | Casàc |
| Coordinates: | 45.5817°N 10.0258°W |
| Province: | (BS) |
| Frazioni: | Bornato, Calino, Pedrocca, Barco, Costa, Ca' del Diaôl |
| Area Total Km2: | 22.14 |
| Population Footnotes: | [1] |
| Population Total: | 11069 |
| Population As Of: | 2011 |
| Population Demonym: | Cazzaghesi |
| Elevation Min M: | 133 |
| Elevation Max M: | 297 |
| Saint: | Francis of Paola |
| Day: | 2 April |
| Postal Code: | 25046 |
| Area Code: | 030 |
Cazzago San Martino (Brescian: Casàc) is a comune in the province of Brescia, in Lombardy in Franciacorta. It is bounded by other communes of Rovato, Ospitaletto.
The altitude of the commune ranges from 133to above sea level.