The Kōseikai (Japanese: 公正会, "Fairness Association") was a political party in Japan.
The party was established in December 1916 by 36 National Diet members as a merger of a group of independents and the remaining members of the Kōyū Club who had not joined the new Kenseikai when it was established in September.[1] However, it was dissolved the following month in 1917, and several of its members were amongst the founders of the Ishinkai after the April 1917 elections.[1]