Xu Gong (pronunciationⓘ) (died 200) was a Chinese politician and minor warlord who lived during the late Eastern Han dynasty of China.
He was a close friend of Xu Jing, who fled to the Jiangdong territories in the early 190s to evade the chaos in central China.
Sun Ce defeated Xu Gong at Youquan (由拳縣; south of present-day Jiaxing, Zhejiang) and seized control of Wu Commandery.
Xu Gong fled to Wucheng County (烏程縣; south of present-day Huzhou, Zhejiang) after his defeat and took shelter under Yan Baihu, a bandit chief.
In the letter, Xu Gong noted that Sun Ce was very much like Xiang Yu, and he urged Cao Cao to summon Sun Ce to the imperial capital Xu (許; present-day Xuchang, Henan) in the name of the Emperor and keep him in the imperial capital lest he became a threat in the future.