An-Nasir Yusuf (Arabic: الناصر يوسف‎; AD 1228–1260), fully al-Malik al-Nasir Salah al-Din Yusuf ibn al-Aziz ibn al-Zahir ibn Salah al-Din Yusuf ibn Ayyub ibn Shazy (الملك الناصر صلاح الدين يوسف بن الظاهر بن العزيز بن صلاح الدين يوسف بن أيوب بن شاذى), was the Ayyubid governor of Syria from his seat in Aleppo (1236–1250) and the sultan of the Ayyubid Empire from 1250 until the sack of Aleppo by the Mongols in 1260. He also governed Damascus after 1250.