Zhang Chengye (張承業), né Kang (康), courtesy name Jiyuan (繼元), was an important eunuch official of the Chinese Five Dynasties and Ten Kingdoms period state former Jin. He served in the Tang Dynasty palace late during Tang, and eventually became an important advisor to Jin's princes Li Keyong and his successor Li Cunxu.

Li Keyong was a Chinese military general and politician of Shatuo ethnicity, and from January 896 the Prince of Jin, which would become an independent state after the fall of the Tang dynasty in 907. Li served as a Jiedushi provincial military governor during the late Tang period and was an instrumental figure in the development of a Shatuo base of power in what is today's Shanxi Province of China. His son Li Cunxu, a child of his concubine Lady Cao, would succeed him as Prince of Jin and eventually become the founding emperor of the Later Tang dynasty in 923.