Nipponzan-Myōhōji-Daisanga (日本山妙法寺大僧伽), often referred to as just Nipponzan Myohoji or the Japan Buddha Sangha, is a Japanese new religious movement and activist group founded in 1917 by Nichidatsu Fujii, emerging from Nichiren Buddhism. "Nipponzan Myōhōji is a small Nichiren Buddhist order of about 1500 persons, including both monastics and lay persons." The community reveres the Lotus Sutra as the highest expression of the Buddhist message.

Nichiren Buddhism, also known as Hokkeshū, is a branch of Mahayana Buddhism based on the teachings of the 13th-century Japanese Buddhist priest Nichiren (1222–1282) and is one of the Kamakura period schools. Its teachings derive from some 300–400 extant letters and treatises either authored by or attributed to Nichiren.