Clockwork Planet (クロックワーク・プラネット, Kurokkuwāku Puranetto) is a Japanese light novel series, written by Yuu Kamiya and Tsubaki Himana, and illustrated by Shino.

The main characters are five people (a machine otaku, two automata, a young technician and a bodyguard) who, after a month of meeting, become the world's most infamous terrorists.

Promising loyalty to him, the two are eventually found out by Dr. Marie Bell Breguet, a princess of a noble family and the youngest person to become a master engineer in an international separate government organization "Meister Guild", and her automaton bodyguard Vainney Halter.

With the faulty Core Tower, a central tower in every Grid city controls its gear functions, Naoto pinpoints the problem with his sense of hearing alone in ten minutes, fixing it along with other engineers of the Meister Guild and thwarting the government's attempts to purge the city and destroy lives.

As the government's illegal technological experimentation is still at large, the pairs join forces to carry out justice and prevent further purges.