Musaeus () was an officer of Antiochus III the Great, the ruler of the Seleucid Empire. Following his defeat in the Battle of Magnesia (190 BC) Antiochus III sent Musaeus to the triumphant Roman consuls (Scipio Asiaticus and Scipio Nasica), then stationed at Sardis to request their permission to start negotiating a peace treaty. According to Polybius