Fairy Cube (妖精標本, Yōsei Hyōhon) is a shōjo manga series written and illustrated by Kaori Yuki. Appearing as a serial in the Japanese manga magazine Hana to Yume from February 2005 to 2006, the Fairy Cube chapters were collected into three bound volumes by Hakusensha and published from October 2005 to July 2006. A related short story, "Psycho Knocker", appeared in the October 2004 issues of the same magazine.
Viz Media licensed Fairy Cube for an English-language release in North America. It previewed the series in its manga anthology Shojo Beat and released the series from May 2008 to November 2008. A digital edition was published in 2011. Another English translation has been published by Chuang Yi in Singapore, and the series has been translated into several other languages.
Set in a fictional universe in which a fairy-inhabited Otherworld exists alongside present-day Earth, the series focuses on Ian Hasumi, a teenager who can see fairies, and his childhood friend Rin. After Ian's body is stolen from him, he starts on a journey to reclaim it and soon finds himself in conflict with a group of fairies who hope to capture the Earth by opening a pathway from the Otherworld.