Montaldeo is a comune (municipality) in the Province of Alessandria in the Italian region Piedmont, located about 100 kilometres (62 mi) southeast of Turin and about 35 kilometres (22 mi) southeast of Alessandria.

Montaldeo borders the following municipalities: Casaleggio Boiro, Castelletto d'Orba, Lerma, Mornese, Parodi Ligure, and San Cristoforo.

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