Zhu Yansi (朱延嗣) (died 826) was a general of the Chinese Tang dynasty, briefly ruling Lulong Circuit (盧龍, headquartered in modern Beijing) after his father Zhu Kerong's death.
Zhu Yansi assumed the title of acting military governor.
Less than four months later, the officer Li Zaiyi led another mutiny and killed Zhu Yansi, and further slaughtering his family.
Li submitted a report to the imperial government accusing Zhu Yansi of crimes.
The imperial government subsequently commissioned Li as the new military governor.