Guarcino is a comune (municipality) in the Province of Frosinone in the Italian region Lazio, located about 70 km east of Rome and about 20 km north of Frosinone in the Monti Ernici area.
It is the ancient Varcenum of the Hernici, likely founded in the 8th century BC. After the Roman conquest and the fall of the Western Roman Empire, it was a free commune and later a fief in the Papal States. Pope Boniface VIII had a palace in the town.
- ^ All demographics and other statistics: Italian statistical institute Istat.