Hideki Matsutake (born August 12, 1951 in Yokohama, Kanagawa Prefecture, Japan) is a Japanese composer, arranger, and computer programmer. He is known for his pioneering work in electronic music and particularly music programming, as the assistant of Isao Tomita during the early 1970s and as the "fourth member" of the band Yellow Magic Orchestra during the late 1970s to early 1980s.