Al-Mansur Ali (, epithet: al-Malik al-Manṣūr Nūr ad-dīn ʾAlī ibn Aybak, Arabic: الملك المنصور نور الدين علي بن أيبك) (b. c. 1242) was the second of the Mamluk Sultans of Egypt in the Turkic, or Bahri, line. Some historians, however, consider Shajar al-Durr as the first of the Mamluk Sultans; thus, to them Al-Mansur Ali was the third Mamluk Sultan and not the second. He ruled from 1257 to 1259 after the assassination of his father Aybak during a turbulent period that witnessed the Mongols invasion of the Islamic world.