Abū al-Thanā’ Shihāb ad-Dīn Sayyid Maḥmūd ibn ‘Abd Allāh al-Ḥusaynī al-Ālūsī al-Baghdādī (Arabic: أبو الثناء شهاب الدين سيد محمود بن عبد الله بن محمود الحسيني الآلوسي البغدادي; 10 December 1802 – 29 July 1854 CE) was an Iraqi Islamic scholar best known for writing Ruh al-Ma`ani, an exegesis (tafsir) of the Qur'an.