The Taishu-kai (太州会 Taishū-kai?) is a yakuza organization based in Fukuoka Prefecture on the Kyushu island of Japan, with an estimated 180 active members.
The Taishu-kai was formed around 1954 under the name "Ota Group" (太田グループ Ōta Gurūpu?) by Kuniharu Ota (太田 州春 Ōta Kuniharu?), a mineworker who became the first president. The Ota Group was later renamed the "Ota-gumi" (太田組 Ōta-gumi?), and again renamed the "Taishu-kai" in May 1973. Yoshihito Tanaka (or Yoshito Tanaka) succeeded Ota in December 1991.
Headquartered in Tagawa, Fukuoka, the Taishu-kai is one of the five independent Fukuoka-based designated yakuza syndicates, along with the Kudo-kai, the Dojin-kai, the Fukuhaku-kai and the Kyushu Seido-kai.