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Yuan Tan (died 205), courtesy name Xiansi, was a Chinese military general, politician, and warlord who was the eldest son of Yuan Shao, a warlord who occupied much of northern China during the late Eastern Han dynasty. After Yuan Shao's death, Yuan Tan engaged his younger brother, Yuan Shang, in a power struggle over their father's territories. He sought help from his father's rival, Cao Cao, and defeated Yuan Shang with Cao's help. However, the alliance between Yuan Tan and Cao Cao was eventually broken and Yuan was defeated and killed in the Battle of Nanpi by Cao Cao's troops.