Siege of Luoyang can refer to any of the following sieges of the Chinese city of Luoyang, which served as imperial capital to a number of Chinese dynasties:

• Siege of Luoyang (538), by Gao Huan
• Siege of Luoyang (613), by Yang Xuangan
• Siege of Luoyang (618), by Li Mi
• Siege of Luoyang (620–621), by Li Shimin
• Siege of Luoyang (1234), during the Mongol conquest of the Song dynasty

• Disaster of Yongjia

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