Abul-Ḥasan Bahmanyār ibn Marzubān 'Ajamī Aḍarbāyijānī, known as Bahmanyār (died 1067), was a famous pupil of Avicenna. He was of Persian Zoroastrian background, though he later converted to Islam. His knowledge of Arabic was not perfect.
His correspondence with Avicenna and his master's answers to his questions were compiled in the book Mubahathat (dialogues). His main work, the Ketab al-tahasil which summarizes Avicenna's logic, physics and metaphysics was written in Isfahan between 1024 and 1037 and dedicated to his uncle, the Zoroastrian Abu Mansur b. Bahram b. Khurshid b. Yazdyar. Bayhaqi also writes that he wrote a book on logic and one on music and other works are attributed to him.
- Encyclopedia Iranica, "Bahmanyar Kia", H. Daiber  excerpt: "Originally a Zoroastrian converted to Islam,"
- Nicholas Rescher, "The development of Arabic logic", University of Pittsburgh Press, 1964. pg 157: "Abu 'l-Hasan Bahmanyar ibn al-Marzuban was a Persian, a younger contemporary and respected student of Avicenna"
- Henry Corbin, "History of Islamic philosophy", Kegan Paul International, 1993. pg 174: " good Zoroastrian with a typically Iranian name, Bahmanyar ibn al-Marzuban, whose important work remains "
- Rahman, F. "Bahmanyār , Abu'l-Hasan Bahmanyar b. al-Marzuban." Encyclopaedia of Islam. Edited by:P. Bearman , Th. Bianquis , C.E. Bosworth , E. van Donzel and W.P. Heinrichs. Brill, 2007
- Zirikli, Khay ud din. "بهمنيار". Retrieved 30 September 2012.