Yanshi is a county-level city administered by the prefecture-level city of Luoyang in western Henan province in the People's Republic of China. Yanshi lies on the Luo River.

Cao Mao (241–260), courtesy name Yanshi, was the fourth emperor of the state of Cao Wei during the Three Kingdoms period. He was a grandson of Wei's first emperor Cao Pi. Described as intelligent and studious, Cao Mao made repeated attempts to seize back state power from the regents Sima Shi and Sima Zhao but failed. He was killed in an abortive coup d'état against Sima Zhao.