Nittatsu Hosoi (細 井 日 達, Hosoi Nittatsu also known as Nittatsu Shonin; 15 April 1902, Tokyo – 22 June 1979) was the 66th High Priest of the Nichiren Shoshu Head Temple Taisekiji in Fujinomiya, Shizuoka Prefecture, Japan. Previously, he served as chief priest at Hondenji temple in Osaka and Jozaiji temple in Ikebukuro, Tokyo.