| Muhammad I al-Mustansir | |
|---|---|
 Gold dinar of Muhammad I al-Mustansir | |
| 2nd Sultan of the Hafsid Sultanate | |
| Reign | c. 1249–c. 1277 |
| Predecessor | Abu Zakariya Yahya |
| Successor | Yahya II al-Wathiq |
| Born | c. 1228 |
| Died | c. 1277 (aged 48–49) Hafsid Sultanate |
| Dynasty | Hafsids |
| Father | Abu Zakariya Yahya |
| Religion | Islam |
Muhammad I al-Mustansir (Arabic: أبو عبد الله محمد المستنصر, romanized: Abu Abd Allah Muhammad al-Mustansir ibn Yahya; c. 1228–1277) was the second ruler of the Hafsid dynasty in Ifriqiya and the first to claim the title of Khalif. Al-Mustansir concluded a peace agreement to end the Eighth Crusade launched by Louis IX of France in 1270. Muhammad I al-Mustansir had been a vassal of the Kingdom of Sicily, but had shaken off his allegiance when King Manfred was overthrown by King Charles I.