Rainbow: Nisha Rokubō no Shichinin (Japanese: RAINBOW 二舎六房の七人, "Rainbow: The Seven from Block 2, Cell 6"), is a Japanese manga series written by George Abe and illustrated by Masasumi Kakizaki. It was serialized in Shogakukan's seinen manga magazine Weekly Young Sunday from November 2002 to July 2008, when the magazine ceased publication; it was then transferred to Weekly Big Comic Spirits, where it ran from June 2009 to January 2010. Its chapters were collected in 22 tankōbon volumes. The story is set in the 1950s and focuses on six junior delinquents sent to the Shōnan Special Reformatory. They learn to cope with the atrocities and unfairness they encounter there.

A stage adaptation written and directed by Kōtarō Yoshitani was produced in February 2007. A 26-episode anime television series adaptation produced by Madhouse and directed by Hiroshi Kōjina was broadcast on Nippon TV from April to September 2010.

The manga has had over 3.3 million copies in circulation. In 2006, Rainbow won the 51st Shogakukan Manga Award in the general category.