Tsutomu Nihei (born 1971) is a Japanese manga artist. He is relatively lesser known outside Japan, though his cyberpunk-influenced artwork has gained a strong cult following.
Nihei has produced everything from erotic manga to the BLAME! series. He was responsible for both the art and the story for the section of the Halo Graphic Novel called "Breaking Quarantine: The untold story of Sergeant Johnson's escape from the Flood.