Phasael (died 40 BC; Latin: Phasaelus; from Greek: Φασάηλος, Phasaelos; Hebrew: פסאל), was a prince from the Herodian Dynasty of Judea.
Phasael was born in the Hasmonean Kingdom to a Jewish aristocratic family of Edomite descent. His father, Antipater the Idumaean, was the close advisor of the Hasmonean king Hyrcanus II, and his mother Cypros was a Nabatean princess. Phasael was the elder brother of Herod.
Both Phasael and Herod began their careers under their father, Antipater, who was appointed procurator of Judea for the Roman Republic by Julius Caesar. Antipater appointed Phasael to be governor of Jerusalem, and Herod governor of Galilee. When Phasael's brother Herod was summoned to be tried by the Sanhedrin he meant to come to Jerusalem with an army and make war, however Antipater and Phasael managed to convince him to be satisfied with making threats of force.
While Mark Antony was in Bithynia about 41 BC, accusations were brought before him against the two brothers, who were objects of hatred to many Jews, but the shrewd Herod succeeded in obtaining the dismissal of the charges. It was impossible, however, for the Sanhedrin to rest content with the administrations of Herod and Phasael; and charges were again brought against them before Antony at Antioch. Once more the accusations proved to be fruitless, for Antony was indebted to Antipater, while even the weak Hyrcanus II pleaded for them. This led Antony to appoint the pair .