Denjirō Kōtoku (幸徳 傳次郎 Kōtoku Denjirō, November 5, 1871 – January 24, 1911), better known by the nom de plume Shūsui Kōtoku (幸徳 秋水 Kōtoku Shūsui), was a Japanese socialist and anarchist who played a leading role in introducing anarchism to Japan in the early 20th century, particularly by translating the works of contemporary European and Russian anarchists, such as Peter Kropotkin, into Japanese.