Giarole is a comune (municipality) in the Province of Alessandria in the Italian region Piedmont, located about east of Turin and about north of Alessandria. As of 31 December 2004, it had a population of 693 and an area of .
Giarole borders the following municipalities: Mirabello Monferrato, Occimiano, Pomaro Monferrato, and Valenza.
As historical place it is notable the Castle of Sannazzaro, built in the 12th century.