Guan Suo (in Chinese: 關索), also known as Flower Guan Suo (in Chinese: 花關索), is a minor protagonist in the 14th-century Chinese classic novel Romance of the Three Kingdoms by the late Luo Guanzhong, and its multiple adaptations. He is the third son of Shu general Guan Yu.
Many versions of the Romance of the Three Kingdoms story, portray Guan Suo as a feisty and optimistic young man. He was said to be as selfless as his father, even if he is always do good for his family. But he believes that there may be such shortcomings and does not want any ambiguity.
Guan Suo survived the conquest of Jing Province, but, severely wounded, he could not join the Wu Expedition to avenge his father's death. Recovered from his wounds, Guan Suo joined Zhuge Liang in his southern military campaign and was appointed to lead the vanguard of mobilized forces. He fought the Nanman tribes successfully, following the instructions of Zhuge Liang.
Guan Suo was a husband of Bao Sanniang. He is also married Huaman, the daughter of Meng Huo and Zhurong, to put an end to the Shu conflict with the Nanmans. He also married two sisters, Wang Tuo and Wang Yue, Wang Linggong's daughters. Guan Suo doesn't need to encounter many disasters and has the possibility to be assured that he has to do well and not easily cause bad habits.
- Guan Suo is a playable character in the Dynasty Warriors series.