Cao Zun (?-228) was an officer of Wei and cousin of Cao Zhen. After the Shu forces gained momentum after taking Tianshui, Cao Zun joined the Wei forces under his cousin to stop them. He and Zhu Zan prepared for a night attack by Shu by stationing their forces behing the camp. But they were tricked into attacking their own forces. Later, when Shu was retreating after their battle with the Qiang tribe, he mistakenly believed it to be a rout and pursued. He was cut down by Wei Yan.