Nishikawa Susumu (西川進; born July 9, 1959 in Yawata, Kyoto Prefecture, Japan) is a singer, guitarist, arranger, composer and record producer. He is a former member of the Japanese rock band Diamond Head, which disbanded in 2005. He's also the guitarist for Buono!'s singles. He began working as a solo singer in 2007 and has released three albums. He is the owner of 'Smash Room School'.