Genocidal Organ (虐殺器官, Gyakusatsu Kikan) is the debut novel of Japanese science fiction writer Project Itoh. It was first published by Hayakawa Publishing in 2007 and later re-printed in 2010 in paperback form. A poll by the yearly SF magazine SF ga yomitai ranked Genocidal Organ as the number one domestic SF novel of the decade. The English translation of Genocidal Organ, translated by Edwin Hawkes, was published in August 2012 by Haikasoru / Viz Media.