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