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.
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.
For example, the Qing ruler was referred to as the "Chinese Highness Bogda Khan" (Russian: китайского бугдыханова высочества) in the Russian version of the 1689 Treaty of Nerchinsk.
During the 1911 Revolution that eventually led to the fall of the Qing dynasty, Outer Mongolia declared its independence from the Qing dynasty under the leadership of the 8th Jebtsundamba Khutuktu, who used the title Bogd Khan (as the successor of Bogda Khan) and established the Bogd Khanate.