Social Democratic Party (Japan) (disambiguation)

The Social Democratic Party (社会民主党) is a currently active Japanese political party established in 1996.

Social Democratic Party may also refer to the following parties in Japan:

Historical political parties

 * Japan Socialist Party (日本社会党), also referred to as the 'Social Democratic Party of Japan', a major Japanese political party that existed from 1945 to 1996
 * Social Democratic Party (Japan, 1926) (社会民衆党), a political party that existed from 1926 to 1932
 * Social Democratic Party (Japan, 1901) (社会民主党), a political party that existed briefly in 1901