Orontobates (Old Persian: Arvantapātaʰ, Greek Ὀρoντoβάτης; lived 4th century BC) was a Persian, who married the daughter of Pixodarus, the usurping satrap of Caria, and was sent by the king of Persia to succeed him. On the approach of Alexander the Great of Macedon (334 BC) Orontobates and Memnon of Rhodes entrenched themselves in Halicarnassus. But at last, despairing of defending it, they set fire to the town, and under cover of the conflagration crossed over to Cos, whither they had previously removed their treasures. In addition to the island of Cos, Orontobates, retained control of the citadel at Salmacis, and the towns Myndus, Caunus, Thera and Callipolis together with Triopium.