Ken Terauchi (born 1957) was a Japanese yakuza who was affiliated with the Kazama-gumi subsidiary of the Tojo-kai in Tokyo during the 2000s. On 11 December 2005, he and several other Kazama-gumi henchmen accompanied Osamu Kashiwagi to confront Futoshi Shimano and his Shimano-gumi underlings when they attacked Shintaro Kazama at Shibaura wharf, aiding Kazuma Kiryu in taking down Shimano and his men.