Gaius Vibius Pansa Caetronianus (died 23 April 43 BC) was consul of the Roman Republic in 43 BC. Although supporting Gaius Julius Caesar during the Civil War, he pushed for the restoration of the Republic upon Caesar’s death. He died of injuries sustained at the Battle of Forum Gallorum.
Pansa was the son of moneyer Gaius Vibius Caii filius Pansa. One of the first members of the gens Vibius to achieve political success, he was a Novus homo who rose through the cursus honorum as a result of his friendship with Julius Caesar, under whom he served in Gaul. Originally of Etruscan descent and hailing from Perusia (modern Perugia), and possibly from a family which had been proscribed under Lucius Cornelius Sulla, Pansa was elected Plebeian Tribune in 51 BC where he vetoed a number of anti-Caesarean resolutions of the Senate. During the civil war between Julius Caesar and Pompey, he actively supported the cause of the Caesareans. In 48 BC it is believed he was elected either as an aedile or as a praetor.
In 47 BC Pansa was appointed governor of Bithynia et Pontus, and returned to Rome sometime during 46 BC. In that same year, Caesar appointed Pansa as governor of Cisalpine Gaul to replace Marcus Junius Brutus, a post he took up on 15 March 45 BC. Around this time, he was also elected to the post of augur, one of the priests of Ancient Rome. In early 44 BC, Caesar designated him as the consul for the upcoming year (43 BC) and sometime before 21 April 44 BC, Pansa had returned from Cisalpine Gaul, and was based at Campania, waiting for the situation at Rome to settle down after the assassination of Julius Caesar on 15 March 44 BC.