Gaius Vibius Postumus was a Roman senator, who flourished under the reign of Augustus.
He was suffect consul for the latter half of AD 5 with Gaius Ateius Capito as his colleague.
[1] Ronald Syme identifies him as a novus homo from Lavinum in Apulia.
[2] His brother Aulus Vibius Habitus was suffect consul in the latter half of AD 8.
[3] Postumus shared in the achievements of Lucius Apronius and earned the ornamenta triumphalia for his distinguished valor in the Dalmatian revolt.