Satoru Kōsaki is a Japanese music composer and arranger. He is best known for his work on anime, including Lucky Star, The Melancholy of Haruhi Suzumiya, Monogatari, Beastars and The Apothecary Diaries. He worked at Namco, where he primarily composed soundtracks for video games. Since 2005, he has been affiliated with Keiichi Okabe's music production company Monaca, where he has often collaborated with his colleagues to produce soundtracks for anime and other media.