Wang Mang (Chinese: 王莽) (c. 45 BC – 6 October 23 AD), courtesy name Jujun (Chinese: 巨君; pinyin: Jùjūn), was the founder and the only emperor of the short-lived Chinese Xin dynasty. He was originally an official and consort kin of the Han dynasty and later seized the throne in AD 9. The Han dynasty was restored after his overthrow, and his rule marked the separation between the Western Han dynasty (before Xin) and Eastern Han dynasty (after Xin). Some historians have traditionally viewed Wang as a usurper, while others have portrayed him as a visionary and selfless social reformer. Though a learned Confucian scholar who sought to implement the harmonious society he saw in the classics, his efforts ended in chaos.

In 23 October AD, the capital Chang'an was attacked and the imperial palace ransacked. Wang Mang died in the battle. The Han dynasty was re-established in either 23 AD when the Gengshi Emperor took the throne, or in 25 AD when Emperor Guangwu of Han took the throne after defeating the Red Eyebrows who deposed the Gengshi Emperor.