Masaya Nakahara (中原 昌也, Nakahara Masaya, born June 4, 1970), also known by his stage names Violent Onsen Geisha and Hair Stylistics, is a Japanese musician, writer and actor. He was described by Allmusic as "one of those musical entities that defy categorization." He co-starred in Shinji Aoyama's 2005 film My God, My God, Why Hast Thou Forsaken Me? with Tadanobu Asano.