An-Nasir Dawud (1206–1261) was briefly (1227–1229) Ayyubid sultan of Damascus and later (1229–1248) Emir of Kerak.
An-Nasir Dawud was the son of Al-Mu'azzam, the Ayyubid Sultan of Damascus from 1218 to 1227. On his father's death, An-Nasir succeeded, but soon faced opposition from his uncle, Al-Kamil of Egypt, who made war on him, conquering Jerusalem and Nablus. An-Nasir appealed for help to his other uncle, Al-Ashraf, ruler of Harran. Al-Ashraf, however, betrayed his nephew, coming to an agreement with Al-Kamil to divide An-Nasir's lands between them - Al-Ashraf would take Damascus and the north, while Al-Kamil took control of Palestine.
An-Nasir, however, realizing the deception in time, retreated to his capital of Damascus, where he was besieged by the combined armies of his uncle late in 1228. The siege until June 1229, when Al-Ashraf finally captured Damascus, and became ruler, although acknowledging the overlordship of his older brother. An-Nasir was compensated with the lordship of Kerak in the Transjordan region.
An-Nasir Dawud was to rule from Kerak for the next thirty years.