Ubayd Allah ibn Marwan ibn al-Hakam (Arabic: عبيدالله بن مروان بن الحكم‎) (fl. 684–705) was an Umayyad prince and commander. He was the son of the Umayyad caliph Marwan I (r. 684–685) and the latter's wife Umm Aban, a daughter of Caliph Uthman (r. 644–656).[1] Ubayd Allah's half-brother Caliph Abd al-Malik (r. 685–705) appointed him as one of the commanders of the near-annual raids against the Byzantine frontier with the Umayyad Caliphate.[1] Abd al-Malik also appointed Ubayd Allah, for an unclear period, the governor of the Balqa, a subdistrict of the Damascus district spanning the area between Syria and Wadi al-Qura (in northwestern Arabia).[1] Ubayd Allah's full brothers Aban and Uthman also held command roles under Abd al-Malik.[1][2]