Geng Kui (), born in Xianyang, Shaanxi, was a general sent by Dou Xian to defeat the unnamed Northern Chanyu, leader of the Xiongnu nomads. He achieved this in 91 AD, shortly after the Battle of Ikh Bayan. The Northern Chanyu was defeated once more and fled away, abandoning his kingdom. It is unknown where he went or what became of him. About the time Chanyu Tan died in 124, Geng Kui left office.