Taj al-Din Zangi (Persian: تاج الدین زنگی) was the Ghurid ruler of Sarakhs from c. 1200 to 1204/5.
He was the son of the Ghurid ruler of Bamiyan, Fakhr al-Din Masud.
Zangi also had a brother named Shams al-Din Muhammad ibn Masud.
Zangi is first mentioned during the Ghurid conquest of western Khorasan, where he was appointed as the governor of Sarakhs, and was also given Abiward and Nasa as part of his domains.
[2] The Ghurid prince Nasir al-Din Muhammad Kharnak shortly came to the aid of Zangi, and inflicted a heavy defeat on the Khwarazmians.