Sima Ang (died 205 BC) was a ruler of the Kingdom of Yin (殷國) of the Eighteen Kingdoms during the Chu–Han Contention, an interregnum between the Qin Dynasty and the Han Dynasty. Sima Ang was originally a general of the insurgent Zhao kingdom during the Qin Dynasty. After the fall of Qin in 206 BC, Xiang Yu divided the former Qin Empire into the Eighteen Kingdoms and granted Sima Ang the title of "King of Yin" (殷王). Sima Ang's fief covered parts of present-day northern Henan and southern Hebei provinces, with his capital at Zhaoge (朝歌; present-day Qi County, Hebi, Henan)