Arpino (anc. Arpinum), a town of S. Italy, in the province of Terra di Lavoro, 8 m. S. of Sora; pop. about 6,500. It has manufactures of woollen cloth, paper, and parchment. It was originally a town of the Volsci, and subsequently of the Samnites, from whom it was wrested by the Romans in 304 B. C. It is the birthplace of Marius and Cicero, whose brother Quintus had a celebrated villa called Arcanum.