Frontino is a comune (municipality) in the Province of Pesaro e Urbino in the Italian region Marche. As of 2001, it had a population of 369 and an area of 10 square kilometres (3.9 sq mi) which amounts to 37 people per square kilometre.

Frontino borders the following municipalities: Carpegna, Piandimeleto, and Pietrarubbia. It is one of I Borghi più belli d'Italia ("The most beautiful villages of Italy").