Gaius Julius Polybius (fl. 1st century ) was a freedman of Emperor Claudius who was elevated to the secretariat during his reign. He assisted Claudius in his literary, judicial and historical pursuits as a researcher before the emperor's accession and this became Polybius' official role in the imperial bureaucracy, with the title a studiis. Suetonius, the biographer and secretary to the Emperor Hadrian, claims that Claudius was so appreciative of his help that Polybius was allowed to walk between the consuls when on official business.