Gongsun Zan (公孫瓚 gong1 sun1 zan4), courtesy name Bogui, was a warlord of northern China active toward the end of the second century AD.

He was commander of a cavalry force and served on the northern and eastern frontiers of the Han Dynasty empire fighting against various non-Chinese peoples. In 191, Gongsun enlisted as part of the coalition against Dong Zhuo but used the opportunity to enlarge his territories. Throughout the 190s he fought a series of battles with the warlord Yuan Shao for control of north China, starting with the Battle of Jieqiao. He was defeated by Yuan in 199 and committed suicide.

Gongsun Zan was known as the 'General of Baima' and renowned for his brigade of elite cavalry from Baima, made up completely of horses of pure white (Bai Ma means white horse in Chinese). It seems he hit on the tactic of using all white horses in battle when he learned the barbarians he was then fighting against considered the animals sacred and would run from them instead of fighting.