Sayf ad-Din ʿAlī al-Mashtub al-Hakkārī (Arabic: سيف الدين علي المشطوب الهكاري; c. 1130s – 6 November 1192 CE) was a Kurdish emir and one of the leading generals in Saladin's army. Born into the Hakkārī Kurdish princely family, he rose through the ranks under Nūr ad-Dīn Zangī and later served the Ayyubid state.
Distinguished by a facial scar from battle hence the epithet al-Mashtub “the slashed” or "Scarred" (“le Balafre” of the European chronicles), he commanded Hakkārī troops loyal to Saladin and was known among his contemporaries as “King of the Kurds.” Al-Mashtub took part in the three Zangid campaigns to Egypt, helped secure the transition of power to Saladin, and became one of his most trusted strategists. He played crucial roles in the defense of Ḥamāh, the suppression of Crusader incursions, and the conquest of Jerusalem (1187). For his service, he was granted the fiefdom of Sidon and Beirut. During the Third Crusade, he fought at Acre and endured its long siege, showing exceptional bravery until his capture in 1191. He was able to escape his captivity and was rewarded by Saladin with the fiefdom of Nablus before dying in 1192 CE. Contemporary and later chroniclers praised him as one of the bravest and most loyal of Saladin's Kurdish commanders.