Ḍiyāʾ al-Dīn Abū al-Saʿādāt Hibatallāh ibn Alī (Arabic: ضياء الدين أبوالسعادات هبة الله بن علي) (c. 450–542 AH) (c. 1058–1148 AD) simply known as Ibn al-Shajari (إبن الشجري), was a prominent Arab grammarian, philologist and poet of Arabic. Widely celebrated for his knowledge of pre-Islamic Arabic literature.