Masayuki Hiizumi (ヒイズミマサユ機, Hiizumi Masayuki; born February 12, 1978), also known by the name H Zett M (stylised as H ZETT M) is a Japanese keyboardist and producer. He became a member of jazz instrumental band Pe'z in 1999, and was a member of Ringo Sheena's band Tokyo Jihen between 2004 and 2005.
