Chrome Shelled Regios (鋼殻のレギオス, Kōkaku no Regiosu) is a Japanese light novel series by Shūsuke Amagi, with illustrations by Miyū.

A four-panel comic strip adaptation drawn by Masumi Futaba was serialied in Monthly Dragon Age magazine.

A prequel light novel series titled Legend of Regios was published by Fujimi Shobo under its Style-F label.

An anime adaptation produced by Zexcs aired on January 11, 2009, to June 20, 2009, and is licensed in North America by Funimation Entertainment.

The truth is that these are people lost in an alternative reality caught between struggling as pawns of the founders of this space and those trying to destroy it.