The province of Frosinone is a province in the Lazio region of Italy. Its capital is the city of Frosinone. It has an area of 3,247 square kilometres (1,254 sq mi) and a total population of 493,605 (2016). The province contains 91 comuni, listed in the comuni of the province of Frosinone.

Frosinone is a comune (municipality) in the Italian region of Lazio, administrative seat of the province of Frosinone. It is about 75 kilometres (47 mi) southeast of Rome, close to the Rome-Naples A1 Motorway. The city is the main city of the Valle Latina, an Italian geographical and historical region that extends from south of Rome to Cassino.