Xu Yanruo (徐彥若) (died 901), courtesy name Yuzhi (俞之), formally the Duke of Qi (齊公), was an official of the Chinese Tang dynasty, serving as a chancellor during the reign of Emperor Zhaozong.
[4] Emperor Zhaozong made Xu Yanruo the deputy chief imperial censor (御史中丞, Yushi Zhongcheng).
Xu was made chancellor with the designation Tong Zhongshu Menxia Pingzhangshi (同中書門下平章事), along with Cui Zhaowei, to replace them.
In fall 893, Emperor Zhaozong put Li Sizhou (李嗣周) the Prince of Qin in command of a newly conscripted imperial army to escort Xu to Fengxiang.
Xu, along with other chancellors Wang Tuan and Cui Zhaowei, followed him; they (and the emperor) were subsequently able to return to Chang'an after Li Keyong defeated Wang and forced Li Maozhen and another ally, Han Jian the military governor of Zhenguo Circuit (鎮國, headquartered in modern Weinan, Shaanxi), into temporary submission.
[7] After Emperor Zhaozong returned to Chang'an, he gave Xu the honorary titles of Kaifu Yitong Sansi (開府儀同三司) and acting Sikong (司空, one of the Three Excellencies), and created him the Duke of Qi.
The military governor Cheng Rui held a feast for him, but brought up an old dispute between them—Xu's refusal to order the returns of Li (澧州) and Lang (朗州, both in modern Changde, Hunan) Prefectures, both of which previously belonged to Jingnan but which had since been taken by Lei Man the military governor of Wuzhen Circuit (武貞, headquartered at Lang Prefecture) while Xu was chancellor.
In his final petition to the emperor, he recommended the commander of the Qinghai army, Liu Yin, to serve as acting military governor.