Gaius Papirius Carbo, surnamed Arvina, son of Gaius Papirius Carbo (consul 120 BC), was a staunch supporter of the aristocracy, and was put to death by the Marian party in 82. He is known chiefly for the law (lex Plautia Papiria ) carried by him and M. Plautius Silvanus when tribunes of the people in 90 (or 89), whereby the Roman franchise was offered to every Italian ally domiciled in Italy at the time when the law was enacted, provided he made application personally within sixty days to the praetor at Rome. The object of the law was to conciliate the states at war with Rome and to secure the loyalty of the federate states. Like his father, Carbo was an orator of distinction.

[See Cicero, Pro Archia, 4; Vell. Pat. ii.26; Appian, Bell. Civ. i.88].