| Il-Arslan | |||||
|---|---|---|---|---|---|
 Il-Arslan seated on his throne. | |||||
| Khwarazmshah | |||||
| Reign | 22 August 1156 – 7 March 1172 | ||||
| Predecessor | Atsiz | ||||
| Successor | Tekish and Sultan-Shah | ||||
| Died | 7 March 1172 Gurganj, Khwarazm | ||||
| Spouse | Terken Khatun | ||||
| Issue | Ala ad-Din Tekish Jalal ad-Din Sultan-Shah | ||||
| |||||
| House | House of Anushtegin | ||||
| Father | Atsiz | ||||
| Religion | Sunni Islam | ||||
Il-Arslan ("The Lion") (full name: Taj ad-Dunya wa ad-Din Abul-Fath Il-Arslan ibn Atsiz, Persian: تاج الدین ابوالفتح ایل ارسلان بن اتسز) (died March 1172) was the Shah of Khwarezm from 1156 until 1172. He was the son of Atsïz.