Montecastello is a comune (municipality) in the Province of Alessandria in the Italian region Piedmont, located about 80 kilometres (50 mi) east of Turin and about 6 kilometres (4 mi) northeast of Alessandria.

Montecastello borders the following municipalities: Alessandria, Bassignana, Pecetto di Valenza, Pietra Marazzi, Piovera, and Rivarone.

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