Gün Temür (Mongolian: Гүнтөмөр; Mongolian script: ᠭᠦᠩ ᠲᠡᠮᠦᠷ; Chinese: 坤帖木兒), regnal name Toqoqan Khan (Mongolian: Тогоон хаан;[3] Chinese: 托歡汗), (1377–1402) was a khagan of the Northern Yuan dynasty, reigning from 1399 to 1402.
Erdeniin Tobchi claimed that Gün Temür was the eldest son of Elbeg Nigülesügchi Khan, but records in Habib al-siyar and Zafarnama he as other Genghizid (maybe descendant of Ariq Böke[4]).
His name, Gün Temür, means "Deep (intellectually) Iron" in the Mongolian language.
In 1402, Gün Temür was defeated by Gulichi (possibly with Arughtai), who killed him as a result.
Gulichi later seizes the title Örüg Temür Khan.