San Giovanni Incarico is a comune (municipality) in the Province of Frosinone in the Italian region Lazio, located about 100 kilometres (62 miles) southeast of Rome and about 20 km (12 mi) southeast of Frosinone.

San Giovanni Incarico borders the following municipalities: Arce, Ceprano, Colfelice, Falvaterra, Pastena, Pico, Pontecorvo, Roccasecca.