Al-Malik al-Awhad Najm ad-Din Ayyub ibn al-Adil Abu Bakr ibn Najm ad-Din Ayyub (died 1210) was the third Ayyubid emir (prince) of the Diyarbakir emirate, centered in Mayyafariqin, between 1200-1210 CE. He was the fourth eldest son of Sultan al-Adil I of Egypt (r. 1200–1218).