| Shinnen Tagaya | |
| Office: | Chairman of the Japan Socialist Party |
| Birth Date: | 1920 1, df=yes |
| Birth Place: | Kure, Hiroshima Prefecture |
| Death Place: | Tokyo |
| Party: | Japan Socialist Party |
| Alma Mater: | Waseda University |
was a Japanese politician. He graduated from Waseda University in 1943 and became general secretary of the Central Executive Committee of the Japan Socialist Party in December 1977.