Abū Isḥāq Ibrāhīm ibn Muḥammad ibn al-Sarī al-Zajjāj (Arabic: أبو إسحاق إبراهيم بن محمد بن السري الزجاج) was a grammarian of Basrah, a scholar of philology and theology and a favourite at the Abbāsid court. He died in 922 at Baghdād, the capital city in his time.