El Bilga Khatun or Ilbilga Katun was the wife of the 8th century Göktürk Turkic Qaghan, Ilterish Qaghan, the founder of the Second Turkic Khaganate and the mother of Bilgä Qaghan, the fourth Qaghan of the same Khaganate. She is mentioned in the Orkhon inscriptions erected in honor of Bilgä Qaghan and his brother.

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