| Native Name: | 同盟政社 |
| Foundation: | January 1894 |
| Country: | Japan |
| Dissolved: | May 1894 |
| Predecessor: | Dōmei Club |
| Merged: | Rikken Kakushintō |
Dōmei Seisha (Japanese: 同盟政社||Union Association) was a political party in Japan.
The party was established as the Dōmei Club (同盟倶楽部) in November 1892 by a group of 24 mostly independent MPs.[1] It gradually became closer to the Rikken Kaishintō, and in January 1894 was renamed the Dōmei Seisha after becoming a political association.
The party won 24 seats in the March 1894 elections, and in May that year it merged with Dōshi Seisha to form Rikken Kakushintō.[1]