Illig Qaghan, later Tang posthumous title Prince Huang of Guiyi, is the eleventh qaghan of the Eastern Turkic Khaganate.

He attacks the Tang empire and is defeated by a revolt of the Tiele tribes led by the Uyghurs and the Syr-Tardush.

He is the final Qaghan of the first Eastern Turkic Khaganate; the Western Turkic Khaganate continues for 28 years more.