Hoensha (方円社) was a group of professional Go players founded in 1879 around Honinbo Shuho. 'Ho' is square, meaning Go boards. 'En' is circle, meaning Go stones.
Hoensha was the successor to study groups set up by Nakagawa Kamesaburo and other players. It was the major Go institution of the later Meiji period. After Shuho reconciled with the Honinbo House in 1886, Hoensha awarded professional grades. Prior to that point it had awarded only diplomas from 1 to 12 kyu, with the top grades going to players of professional strength.
Heads of Hoensha:
- Honinbo Shuho
- Nakagawa Kamesaburo from 1886
- Iwasaki Kenzo 1899-1912
- Ishii Senji
- Hirose Heijiro
- Iwasa Kei 1924.
The Hoensha house magazine was Igo Shinpo, the first go magazine in history.
The Four Heavenly Kings of Hoensha were Kobayashi Tetsujiro, Mizutani Nuiji, Sakai Yasujiro and Takahashi Kinesaburo. The Three Wunderkinder were Ishii Senji, Sugioka Eijiro and Tamura Yasuhisa (Shusai).