Dayu Tanikawa (born 1968) was a Japanese yakuza who was affiliated with the Nishikiyama-gumi subsidiary of the Tojo-kai in Kabukicho, Tokyo during the 2000s. On the evening of 10 December 2005, he took part in Kyuwa Mochizuki's search for Shinji Tanaka in an abandoned multi-tenant building in the Hotel District, and he and the other Nishikiyama-gumi henchmen were beaten down by Kazuma Kiryu as he made his way to the rooftop where Shinji lay wounded.