Ishaq ibn Kundaj, or Kundajiq, was a Turkish military leader who played a prominent role in the turbulent politics of the Abbasid Caliphate in the late 9th century. Initially active in lower Iraq in the early 870s, he came to be appointed governor of Mosul in 879/80. He ruled Mosul and much of the Jazira almost continuously until his death in 891, despite becoming involved in constant quarrels with local chieftains, as well as in the Abbasid government's rivalry with the Tulunids of Egypt. On his death he was succeeded by his son, Muhammad, but in 892 the Abbasid government under Caliph al-Mu'tadid re-asserted its authority in the region, and Muhammad went to serve in the caliphal court.