Montegridolfo (Romagnol: Mun't Gridòlf) is a comune (municipality) in the Province of Rimini in the Italian region Emilia-Romagna, located about 130 kilometres (81 mi) southeast of Bologna and about 20 kilometres (12 mi) southeast of Rimini.

[4] The municipality of Montegridolfo contains the frazioni (subdivisions, mainly villages and hamlets) Cabaldo, San Pietro, and Trebbio.

In the Middle Ages Montegridolfo was a cassero (fortified burg, known from 1148) contended between the Montefeltro and Malatesta families.

In 1137 it was largely rebuilt to its present state after a destruction by Ferrantino Novello Malatesta, who had allied with the Montefeltro.

After a short period under Cesare Borgia, it was acquired by the Republic of Venice, which in turn ceded it to the Papal States in the early 1509–10.