Hayato Matsuo is a Japanese music composer and orchestrator who primarily does work in video games and anime. He has worked on games such as Front Mission 3, Final Fantasy XII, the Shenmue series, Magic Knight Rayearth, and Hellsing Ultimate. He graduated from the Tokyo University of the Arts in 1991 and began working with composer Koichi Sugiyama as an assistant.
His first score was Master of Monsters. Over the next few years, he worked on several games and anime series. In 1995, he joined the independent music composition group Imagine. He has continued since then to compose and orchestrate works for several game, anime, and television series, as well as a few pieces for original albums.