Occimiano is a comune in the Province of Alessandria in the Italian region Piedmont, located about 60 kilometres east of Turin and about 20 kilometres northwest of Alessandria. Occimiano borders the following municipalities: Borgo San Martino, Casale Monferrato, Conzano, Giarole, Lu e Cuccaro Monferrato, Mirabello Monferrato, and Pomaro Monferrato.