Yū Koyama (小山 ゆう, Koyama Yū, born 20 February 1948 in Ogasa, Shizuoka) is a Japanese manga artist. After graduating from Shizuoka Prefectural Shimada Commercial High School he moved to Tokyo and in 1968 took a job with Saito Productions, the company run by Takao Saitō. In 1971 he worked with Kazuo Koike at Studio Ship.