Ichiyo Hattori (1968-8 December 2005) was a Japanese yakuza who was affiliated with the Nishikiyama-gumi subsidiary of the Tojo-kai clan in Tokyo during the 2000s. In December 2005, he and Juichi Yumoto accidentally killed a woman mistaken for Mizuki Sawamura during interrogation, leading to an infuriated Nishikiyama executing both of them with a handgun.