Liu Hong (129–210), courtesy name Yuanzhuo, was a Chinese astronomer, mathematician, and politician who lived in the late Eastern Han dynasty.
Liu Hong was from Mengyin County (蒙陰縣), Taishan Commandery, which is present-day Mengyin County, Shandong, and was a descendant of Liu Yu, the Prince of Lu, a son of Emperor Jing (r. 157–141 BCE).
He was made an officer at the Imperial Astronomy around 160 CE which led to him writing the lost works Qi Yao Shu (七曜術; The Art of the Seven Planets) and Ba Yuan Shu (八元術; The Art of Eight Elements).
A year later, the Minister of Ceremonies assigned him to review alternative means of calculating eclipses.
Throughout his service under the Han government, Liu Hong held various positions, including: Internuncio (謁者), gucheng menhou (穀城門候), Commandant of the East District of Kuaiji (會稽東部都尉), Administrator of Shanyang (山陽太守) and Chancellor of Qucheng (曲城相).