Yu Jin (died 221) was a military general serving under the warlord Cao Cao during the late Han Dynasty period of Chinese history. He joined Cao in the early years of the civil wars that led to the collapse of the dynasty, and fought in many of the campaigns that established the warlord's position as a central figure of the period preceding Three Kingdoms.
Despite having surrendered to enemy forces at the Battle of Fancheng, Yu Jin was considered by Chen Shou, the Jin Dynasty historian and author of the Records of Three Kingdoms, to be one of the Five Elite Generals of Cao Cao, along with Zhang Liao, Xu Huang, Yue Jin, and Zhang He.