Ala al-Din Atsiz (Persian: علاء الدین اتسز), was Sultan of the Ghurid dynasty from 1213 to 1214.
When Atsiz became an adult, he began serving Ghiyath and the latter's brother Mu'izz al-Din Muhammad.
However, Mu'izz al-Din managed keep him away from the Ghurid chieftains and send him to the court of his relatives in Bamiyan, where Atsiz's daughter married the eldest son of the Bamiyan ruler Baha al-Din Sam II.
Ghiyath al-Din Mahmud later died in 1212, and was succeeded by his son Baha al-Din Sam III, who was one year later carried by the Khwarazmians to Khwarezm,[1] who finally agreed to help Atsiz, and made him ascend the Ghurid throne.
One year later, however, Atsiz was killed by the Turkish ghulam Tajuddin Yildoz, and was succeeded by his cousin Ala al-Din Ali.