Kul Tigin (Kül (Köl, Gül, Göl) Tigin Khan Bengü İnançu Apa Tarkan Taşı) (685 - 731 or 732 AD) was a Turkic leader. He was the son of Ilteris Sad and brother of Bilge Khan and co-ruler of the Gokturk Empire from 716.
He was killed in a war against a branch of Oghuz Turks in 731 or 732 AD. His life story and advices on state administration are carved on one of the monuments known as the Orkhon inscriptions.
