Gengan Tonaki (渡名喜元完; "Tonaki Gengan", 30 October 1884 – 24 January 1997) was a Japanese (Okinawan) farmer and supercentenarian, and at the time of his death at age 112 years, 86 days the oldest Japanese man ever (although the claimed 120-year-old Shigechiyo Izumi was believed to have been older) before being beaten by just 15 weeks by Denzo Ishizaki, the third Japanese man to become a supercentenarian and Tonaki's successor as the oldest living Japanese man, the 5th oldest living Japanese person and (for the last year of his life) the second-oldest living man in the world.