Tahō Fuji Dainichirenge-san Taiseki-ji , more commonly just Sōhonzan Taiseki-ji (総本山大石寺), informally known as Head Temple Taiseki-ji (大石寺), is the administrative center of Nichiren Shoshu Buddhism. It is located in the foothills of Mount Fuji in Kamijo, Fujinomiya, Shizuoka Prefecture, Japan. Taiseki-ji was founded in 1290 by Nikkō Shōnin, one of Nichiren Daishonin's senior disciples, on a land parcel donated by the pious believer Daigyo Sonrei, commonly known as Nanjo Tokimitsu (1259–1332).

Soka Gakkai is a Japanese Buddhist religious movement based on the teachings of the 13th-century Japanese priest Nichiren as taught by its first three presidents Tsunesaburō Makiguchi, Jōsei Toda, and Daisaku Ikeda. It is the largest of the Japanese new religions and claims the largest membership among Nichiren Buddhist groups. The organization bases its teachings on Nichiren's interpretation of the Lotus Sutra and places chanting Nam Myōhō Renge Kyō at the center of devotional practice. The organization promotes its goals as supporting "peace, culture, and education".