Diao Chan (貂蟬, py: Diāo Chán) was one of the Four Beauties of ancient China. She was said to have been born in 169 A.D. Unlike the other three beauties, she never appears in any historical writings and is likely to be a fictional character. According to history writing, Lü Bu did have a relation with a maid of Dong Zhuo's, however, there is no evidence that this was Diao Chan.

Diao Chan appears in Romance of the Three Kingdoms by the Ming dynasty author Luo Guanzhong, in which she assists in a plot by the official Wang Yun to persuade the warrior Lü Bu to kill the tyrant Dong Zhuo. She does this by becoming Dong Zhou's concubine but also Lu Bu's betrothed, then manipulating the two through their jealousy. Lu Bu had to escape shortly after killing Dong Zhou and he lost a battle to Dong Zhou's generals. However, he did meet up with Diao Chan once more. Lu Bu died soon afterwards due to a seige on his city. Diao Chan eventually became one of Cao Cao's concubines.

There is a myth associated with Diao Chan's death. Shortly after Lu Bu was defeated in Xuzhou, Diao Chan given to the victor, Cao Cao, as spoils of war. Cao Cao then used Diao Chan to persuade a captured general, Guan Yu, to join in Cao Cao's ranks. Guan Yu then cut her in half so she would not seduce others with her beauty.