Jiang Gan (fl. 209), courtesy name Ziyi, was a debater and scholar who lived during the late Eastern Han dynasty of China. He is best known for his attempt to persuade Zhou Yu, a general serving under the warlord Sun Quan, to defect to Sun Quan's rival Cao Cao after the Battle of Red Cliffs in the winter of 208–209. In the 14th-century historical novel Romance of the Three Kingdoms, the entire incident not only takes place before the battle, but is also heavily dramatised and exaggerated.