Hiroya Oku (奥 浩哉, Oku Hiroya, born September 16, 1967 in Fukuoka, Fukuoka) is a manga artist who is the creator of Gantz, Zero One and HEN, all of which have been serialized in Young Jump. He is finished working on his most renowned manga, Gantz, which began in July 2000. His manga often contain explicit violence and gore, as well as sexual situations.