Montalto Ligure was a comune (municipality) in the Province of Imperia in the Italian region Liguria, located about southwest of Genoa and about west of Imperia. As of 31 December 2004, it had a population of 364 and an area of . At the beginning of 2018 Montalto Ligure was unified with Carpasio in the new comune of Montalto Carpasio.
Montalto Ligure bordered the following municipalities: Badalucco, Carpasio, Dolcedo, Molini di Triora, and PrelÃÂ.