Abu Ahmad Yahya ibn Ali ibn Yahya ibn Abi Mansur Aban al-Monajjem[1] (Arabic: ابواحمد یحیی ابن علی ابن یحیی ابن ابی منصور آبان المنجم; 241/855-56 – in 13 Rabi' I 300/29 October 912) was a medieval Persian music theorist, literary historian and poet.
[1] His father 'Alī ibn Yaḥyā al-Munajjim (died 888) was a student of the renowned musician Ishaq al-Mawsili.
[2] He is mainly famous for a treatise on music, Resāla fi’l-mūsīqī رساله فی الموسیقی written for Al-Mu'tadid.
His other famous work, of equal importance, is a compilation of biographies with some poetry named Ketāb al-bāher fī aḵbār šoʿarāʾ moḵażramī al-dawlatayn.
He was highly praised by Al-Marzubani as a decent poet.