Ryūkō-ji (龍口寺) is a temple of the Nichiren Shū in the city of Fujisawa, Kanagawa Prefecture, Japan. It stands on the site of the former Tatsukuchi (or Tatsunokuchi) Execution Grounds, and its name uses the same two kanji meaning "dragon mouth"(龍口). It was here that Nichiren, namesake of the Buddhist sect, was to have been executed.