Hiroshi Sakurazaka (桜坂 洋, Sakurazaka Hiroshi, born 1970) is a Japanese author of science fiction and fantasy light novels. He is best known for his novel All You Need Is Kill, which formed the basis of the film Edge of Tomorrow, starring Tom Cruise and Emily Blunt.
Sakurazaka made his debut in 2002 at the second Super Dash Novel Rookie of the Year Award with the novel Mahō tsukai no netto, which was later published in December 2003 under the name Yoku Wakaru Gendai Mahō. This work has subsequently been expanded into a series of light novels and has also been made into an anime. In 2004, he was presented the S-F Magazine Reader's Award's best short story award for The Saitama Chain Saw Massacre. His 2004 novel All You Need Is Kill received high praise from other authors in Japan and has subsequently been published in English by Viz Media.