Liu Yan (?-?) was the Prefect of Dong Jun. At the Battle of Guan Du, he informed Cao Cao that Yuan Shao's officer, Yan Liang, was heading for Bai Ma, allowing Guan Yu to kill Yan Liang. Later, when Guan Yu learned of Liu Bei's whereabouts and left to join him, he told Guan Yu that Xiahou Dun's men were waiting at the Yellow River crossing.

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