Bogda Khan (Mongolian: Богд хаан, ᠪᠣᠭᠳᠠ ᠬᠠᠭᠠᠨ, "Boγda Qaγan"; Chinese: 博格達汗) was a title in the Mongolian language used by emperors of the Qing dynasty of China. It combines the title "Khan" or Khagan ("Qaγan") traditionally used among the Turco-Mongols with the term Bogda (Boγda), meaning "Holy" or "God" in Mongolian. "Bogda Khan" as a whole therefore means "Holy Khan" or "Holy Ruler".
Hong Taiji, the second khan of the Later Jin dynasty, conquered the Northern Yuan dynasty in 1635. He started to use the Mongolian title "Boγda Sečen Qaγan" (Mongolian: Богд Сэцэн хаан, ᠪᠣᠭᠳᠠ ᠰᠡᠴᠡᠨ ᠬᠠᠭᠠᠨ, Chinese: 博格達徹辰汗), and he once referred to himself as "Bogda Khan" in letters to upper-class figures in Mongolia and Tibet.