Bilge Qaghan was the fourth Qaghan of the Second Turkic Khaganate. His accomplishments were described in the Orkhon inscriptions.

The Second Turkic Khaganate was a khaganate in Central and Eastern Asia founded by Ashina clan of the Göktürks that lasted between 682–744. It was preceded by the Eastern Turkic Khaganate (552–630) and the early Tang dynasty period (630–682). The Second Khaganate was centered on Ötüken in the upper reaches of the Orkhon River. It was succeeded by its subject Toquz Oghuz confederation, which became the Uyghur Khaganate.