Abd al-Samad ibn Ali al-Hashimi (Arabic: عبد الصمد بن علي الهاشمي) was an eighth century Abbasid personage.
He was a paternal uncle of the first two Abbasid caliphs al-Saffah (r. 750–754) and al-Mansur (r. 754–775), making him one of the "uncles" ('umumah) that held a high degree of influence during the early years following the Abbasid Revolution.
In 775, Al-Fadl ibn Salih was appointed governor of the region of al-Jazira north of Damascus by the Abbasid caliph al-Mahdi.
Al-Fadl returned to Damascus following his trip to Jerusalem in 780 where he accompanied al-Mahdi as part of his entourage.
[3] It was around this time when he was deposed as governor of al-Jazira and replaced by Abd al-Samad ibn Ali.