Ali ibn Abu'l-Hayja 'Abdallah ibn Hamdan ibn al-Harith Sayf al-Dawla al-Taghlibi (), more commonly known simply by his laqab (honorific epithet) of Sayf al-Dawla ("Sword of the [Abbasid] Dynasty"), was the founder of the Emirate of Aleppo, encompassing most of northern Syria and parts of western Jazira, and the brother of al-Hasan ibn Abdallah ibn Hamdan (better known as Nasir al-Dawla).