Dang Jun is a fictional character in Luo Guanzhong's historical novel Romance of the Three Kingdoms. He was an official of the Cao Wei state and served as an advisor to the general Deng Ai. When Deng was defeated by Jiang Wei during the Cao Wei invasion of Shu Han, Dang bribed Huang Hao to spread rumours in Shu Han that Jiang Wei was planning to defect to Cao Wei. Shu Han's emperor Liu Shan believed the rumours and ordered Jiang Wei to withdraw his troops.