熊本城
is a Buddhist temple of the Nichiren sect, Rokujōmon-ryū (六条門流), in Nishi-ku, Kumamoto, Japan. It is the most high-ranking temple of the sect in Kyushu. In Honmyō-ji is the grave of Katō Kiyomasa, (1562–1611), a Japanese "daimyō", builder of Kumamoto Castle and a dedicated buddhist of Nichiren Buddhism.