The Banu al-Munajjim (Arabic: بنو المنجم), was an Iranian family of Abbasid officials attested in the 9th and 10th centuries.
According to Ibn al-Nadim, the Banu al-Munajjim were descended from Mihr-Gushnasp, a son of the last Sasanian king Yazdegerd III (r. 632–651).
His son, Yahya, worked at the Abbasid court under al-Ma'mun (r. 813–833), and later converted from Zoroastrianism to Islam.
Ali even befriended the caliph al-Mutawakkil (r. 847–861), and his son Yahya did the same with al-Muwaffaq, the de facto regent for his brother al-Mu'tamid (r. 870–892).
Harun had a son named Ali, who eventually served under the Buyids when they became the new rulers of Baghdad.