Zhao Yin (趙隱) (died 881), courtesy name Dayin (大隱), formally the Count of Tianshui (天水伯), was an official of the Chinese dynasty Tang Dynasty, serving as a chancellor during the reigns of Emperor Yizong and Emperor Yizong's son Emperor Xizong.
It is not known when Zhao Yin was born. His family was from Fengtian (奉天, in modern Xianyang, Shaanxi), a town that belonged to Jingzhao Municipality (京兆, i.e., the region of the Tang Dynasty capital Chang'an). Several of his male-line ancestors served as county magistrates during Tang. When Emperor Dezong was forced to flee to Fengtian in 783 after soldiers mutinied against him at Chang'an and supported the general Zhu Ci as their ruler instead, Zhu put Fengtian under siege, and Zhao Yin's grandfather Zhao Zhi (趙植) led his household servants and guests in assisting Fengtian's defense. As a result, after Zhu's rebellion was suppressed, Zhao Zhi entered the imperial government and eventually served as the military governor (Jiedushi) of Lingnan Circuit (嶺南, headquartered in modern Guangzhou, Guangdong) until his death. Zhao Yin's father Zhao Cunyue (趙存約) served on the staff of the former chancellor Li Jiang when Li served as the military governor of Shannan West Circuit (山南西道, headquartered in modern Hanzhong, Shaanxi), and when the soldiers mutinied against Li in 830, Zhao Cunyue tried to assist Li in fighting off the mutineers, but was killed by the mutineers with Li. Zhao Yin had at least one younger brother, Zhao Zhi (趙騭).