The Story of Saiunkoku (彩雲国物語, Saiunkoku Monogatari, literally "Tale of the Kingdom of Colored Clouds") is a series of Japanese light novels written by Sai Yukino and illustrated by Kairi Yura set in fictional ancient China. As of July 2011, the eighteenth and final volume was released, concluding the series. Four side story anthologies have also been released, collecting stories originally published in The Beans magazine.

A manga version, also illustrated by Kairi Yura, is serialized in Beans Ace, which is published by Kadokawa Shoten. However, when Beans Ace ended, the manga was moved to Monthly Asuka. Currently, nine tankōbon volumes have been released. The series has been licensed by Viz Media for an English release in North America as part of their Shojo Beat imprint.The anime adaptation series, produced by Madhouse and directed by Jun Shishido, was broadcast on the Japanese television network NHK on Saturday mornings. The first season began airing on April 8, 2006, and completed its run on February 24, 2007, airing a total of 39 episodes. The second season, titled Saiunkoku Monogatari Second Series (彩雲国物語 第2シリーズ) began airing on April 7, 2007 and consists of another 39 episodes, ending its run on March 8, 2008. A live action Chinese drama adaptation is set to be released in 2023.