Gaius Petronius was a Roman senator, who was active during the Principate. He was suffect consul from September through December AD 25, succeeding Cossus Cornelius Lentulus. Bartolomeo Borghesi has argued that Gaius Petronius is the same person as Gaius Petronius Umbrinus, who is mentioned in an inscription from Rome as curator locorum publicorum iudicandorum; this is unlikely since all known Petronii in the first half of the first century belong to the branch of the Petronii lacking a cognomen.