中国北京紫禁城垣四隅之上的角楼，建成于明永乐十八年（1420年），清代重修。角楼是紫禁城城池的一部分，它与城垣、城门楼及护城河同属于皇宫的防卫设施。 The turret above the four corners of the Forbidden City Wall in Beijing, China, was built in the 18th year of Yongle in the Ming Dynasty 1420 and rebuilt in the Qing Dynasty. The turret is a part of the Forbidden City. It belongs to the defense facilities of the Imperial Palace together with the city wall, gate tower and moat.

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