Ali ibn al-Musayyab (Arabic: عَلِيّ بن المسيب, romanized: Alī ibn al-Musayyab), also known by the honorific Janah al-Dawla (Arabic: جناح الدولة), was co-ruler of Uqaylid Mosul alongside his brother Al-Muqallad ibn al-Musayyab from the death of his predecessor and brother Muhammad ibn al-Musayyab in 996 until his own death sometime before 1001. He was succeeded by his younger brother Hasan ibn al-Musayyab as co-ruler. He has been characterised by historians as representing the "traditional, Bedouin aspect" of the Uqaylid state in juxtaposition to his brother's own style of governing.