Oljei Temur Khagan Bunyashiri (1408-1411) was the Mongol Emperor of Borjigin Mongolia. He was a son of Elbeg Nigulesugchi Khan and younger brother of Gun Temur Khan. He was one of the Borjigin princes; such as Tokhtamysh and Temur Qutlugh; backed by Tamerlane to seize the throne.

Also known as Ulzitumur Khan; the younger brother of Guntumur was born in 1378; the yellow horse year. In 1408; the yellow rat year he assumed the throne and dedicated his entire life to the struggle against the Ming dynasty. Ulzitumur was killed in 1411.