Kenji Maruyama (丸山 健二 Maruyama Kenji, born December 23, 1943) is a Japanese author. He received the Akutagawa Prize for one of his novels, Summer’s Passage (夏の流れ Natsu no nagare), in 1966 at the age of 23, becoming the youngest winner of the Akutagawa Prize up to that time.