Chû Kosaka (小坂忠, born on July 8, 1948) is a Japanese folk singer-songwriter, composer, gospel singer, and pastor. His birth name is Masayuki Kosaka (小坂正行). He began his career in music with the formation of the band The Floral in 1966. The Floral broke up in 1968 and he formed another short-lived band, Apryl Fool, in 1969. He began his solo career in 1971.