| Conventional Long Name: | State of Guan |
| Common Name: | Guan |
| Status: | Vassal state |
| Government Type: | Monarchy |
| Year Start: | ca. 1046 BC |
| Year End: | ca. 1039 BC |
| Event End: | Rebellion of the Three Guards |
| Capital: | Guancheng, Zhengzhou |
| Leader1: | Guan Shu |
| Title Leader: | Ruler |
Guan (; c. 1046–1040 BC) was an ancient Chinese city-state in present-day Henan. Its capital was Guancheng or Guan City (Chinese: 管城) in present-day Guancheng Hui District of Zhengzhou[1] and its power was limited to the immediate surrounding area.
Guan was established soon after the founding of the Zhou dynasty as an appanage for King Wu's younger brother, who was known as Guan Shu Xian. The three brothers Guan Shu Xian, Huo Shu Chu, and Cai Shu Du were known as the Three Guards, for their territories' function protecting the Zhou homeland. Following the death of King Wu, however, the Three Guards and Wu Geng rebelled against the regency of the Duke of Zhou. His victory led to the dissolution of Guan.