Masayuki Naruse (Japanese: 成瀬 昌由, Hepburn: Naruse Masayuki) (born March 15, 1973) is a Japanese mixed martial artist and professional wrestler, competing in the light heavyweight division who fought most of his career in Fighting Network RINGS (RINGS). As a professional wrestler, he notably competed in New Japan Pro Wrestling (NJPW) and All Japan Pro Wrestling (AJPW). In MMA, Naruse was the first and only RINGS Light-Heavyweight Champion and a former IWGP Junior Heavyweight Champion in professional wrestling.