eunuch who dominated the Chinese government during the early rule of the Zhengde emperor (reigned 1506–21) of the Ming dynasty.

The emperor was an eccentric pleasure-seeker, and Liu Jin gradually gained control of the government. Corruption spread, offices were bought and sold, and excessive taxes were levied. Liu and seven other eunuchs who shared power with him became known collectively as the Eight Tigers (Ba Hu) because of the way they terrorized the country. The people became dissatisfied, and rebellions erupted. Finally, a group of officials forced the emperor to banish Liu. When Liu's house was searched, it was found to contain a fortune in gold, silver, and gems as well as a number of false seals. At last the emperor realized the extent of the eunuch's corruption and had him executed.