Postumus Cominius Auruncus was a two-time consul of the early Roman Republic. In 501 BC, Cominius was consul with Titus Lartius, who Livy says was appointed as the first dictator of Rome. Other sources indicate the beginnings of hostilities with the Latins and a conspiracy among slaves during their term. As the consuls of 493 BC, Cominius and Spurius Cassius Viscellinus were elected towards the end of the First secessio plebis in 494 BC. They also conducted a census. In 488, he was among the envoys (legati), all of consular rank, sent to Coriolanus.