Zhao Guangyin (; died May 23, 925) was an official during China's Five Dynasties and Ten Kingdoms period. He was the chancellor during Later Tang. He was a son of the Tang dynasty chancellor Zhao Yin and younger brother of the Later Liang chancellor Zhao Guangfeng and Southern Han chancellor Zhao Guangyi. (He is referred to as Zhao Guangyun (趙光允) in some subsequent historical accounts written during the Song dynasty as part of naming taboo for Song's founding emperor Emperor Taizu of Song (Zhao Kuangyin), but because the naming taboo appeared to be largely limited to consecutive uses of the characters "Kuang" and "Yin," other Song dynasty sources refer to him as Guangyin.)
Background
It is not known when or where Zhao Guangyin was born. His father Zhao Yin served as a chancellor during the reigns of Emperor Yizong of Tang and Emperor Yizong's son and successor Emperor Xizong. His two older brothers Zhao Guangfeng and Zhao Guangyi were both known for their literary talents and virtue. Zhao Guangyin himself, like they were, was known for his ability to write poems,
Zhao Guangyin was described to be himself also frivolous and self-important, however, compared to the more serious disposition of his brother Zhao Guangfeng. It was said that at that time, Zhao Guangfeng was not often hosting guests, but whenever Zhao Guangyin visited him, Zhao Guangyin would try to engage him in talks about politics. Zhao Guangfeng eventually put up a sign on his door, "Please do not discuss the matters of the Office of Chancellors."