Al-Malik al-ʿĀdil Sayf ad-Dīn Abū Bakr ibn Nāṣir ad-Dīn Muḥammad (Arabic: سيف الدين الملك العادل أبو بكر بن ناصر الدين محمد, better known as al-Adil II) (c. 1221 – 9 February 1248) was the Ayyubid Sultan of Egypt from 1238 to 1240.

When his father al-Kamil, nephew of Saladin, died in 1238, al-Adil II followed him somewhat unprepared. When the country plunged into anarchy, his exiled half-brother, as-Salih Ayyub, seized the opportunity and deposed him. Al-Adil died in prison eight years later.

Contemporary Muslim historians wrote disapprovingly about al-Adil II's "boisterous living and loose morals".^[1]: 308 This is seemingly corroborated by an inlaid brass basin made for him by the master craftsman Ahmad al-Dhaki al-Mawsili which contains a "somewhat risqué" depiction of total nudity, the only known example from medieval Islamic metalwork.^[1]: 308

• Basin made by Ahmad al-Dhaki al-Mawsili for al-Adil II, 1238-1240. Louvre Museum.^[2]
• Basin of sultan al-Adil II Abu Bak, 1238-1240, combat scene.^[3]
• Incense burner of Sultan al-Adil II.

• List of rulers of Egypt