Ariobarzanes III, surnamed Eusebes Philorhomaios, "Pious and Friend of the Romans" (Ancient Greek: Ἀριοβαρζάνης Εὐσεβής Φιλορώμαιος, Ariobarzánēs Eusebḗs Philorōmaíos), was the king of Kingdom of Cappadocia from ca. 51 BC until 42 BC. He was of Persian and Greek ancestry. The Roman Senate agreed that he was to be the successor of his father, Ariobarzanes II of Cappadocia; Cicero, Roman governor of Cilicia, noted that he was surrounded by enemies who included his mother, Athenais.