| Montecastello | |
| Official Name: | Comune di Montecastello |
| Native Name: | Moncasté |
| Coordinates: | 44.95°N 49°W |
| Region: | Piedmont |
| Province: | Alessandria (AL) |
| Frazioni: | San Bernardo, San Zeno |
| Mayor: | Gianluca Penna |
| Area Total Km2: | 7.6 |
| Population Total: | 339 |
| Population As Of: | 2005[1] |
| Population Demonym: | Montecastellesi |
| Elevation M: | 116 |
| Postal Code: | 15040 |
| Area Code: | 0131 |
| Website: | http://www.comune.montecastello.al.it/ |
Montecastello is a comune (municipality) in the Province of Alessandria in the Italian region Piedmont, located about 80km (50miles) east of Turin and about 6km (04miles) northeast of Alessandria.
Montecastello borders the following municipalities: Alessandria, Bassignana, Pecetto di Valenza, Pietra Marazzi, Piovera, and Rivarone.