Parties
Parliamentary
自由民主党 (Liberal Democratic Party)
立憲民主党 (Constitutional Democratic Party of Japan)
日本維新の会 (Japan Innovation Party)
公明党 (Kōmeitō)
国民民主党 (Democratic Party for the People)[1]
日本共産党 (Japanese Communist Party)
れいわ新選組 (Reiwa Shinsengumi)
社会民主党 (Social Democratic Party)
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Extraparliamentary
NHKから自国民を守る党 (The Party to Protect the People from NHK)
新社会党 (New Socialist Party of Japan)
緑の党グリーンズジャパン (Green Party Greens Japan)
大阪維新の会 (Osaka Restoration Association)
都民ファーストの会 (Tokyoites First Party)
希望の党 (Party of Hope)- 沖縄社会大衆党 (Okinawa Social Mass Party)
- 政党そうぞう (Political Group of Okinawa Revolution)
第二院クラブ (Dainiin Club)
幸福実現党 (Happiness Realization Party)
日本革命的共産主義者同盟 (Japan Revolutionary Communist League)
革命的共産主義者同盟全国委員会 (Japan Revolutionary Communist League, National Committee)- 日本革命的共産主義者同盟革命的マルクス主義派 (Japan Revolutionary Communist League (Revolutionary Marxist Faction))
国家社会主義日本労働者党 (National Socialist Japanese Workers' Party)
国民党 (Japan Nation Party)
維新政党・新風 (Restoration Political Party - New Wind)
日本第一党 (Japan First Party)
Historical
自由党 (Liberal Party) (1945-1948)- 日本社会党 (Japan Socialist Party) (1945-1996)
日本民主党 (Democratic Party) (1947-1950)- 自由党 (Liberal Party) (1950-1955)
- 改進党 (Kaishintō) (1952-1954)
日本民主党 (Democratic Party) (1954-1955)- 民主社会党 (Democratic Socialist Party) (1960-1994)
新自由クラブ (New Liberal Club) (1976-1986)
社会民主連合 (Socialist Democratic Federation) (1978-1994)- 日本新党 (Japan New Party) (1992-1994)
新生党 (Japan Renewel Party) (1993-1994)
新党さきがけ (New Party Sakigake) (1993-2004)
自由連合 (Liberal League) (1994-2005)- 新進党 (New Frontier Party) (1994-1997)
自由党 (Liberal Party) (1998-2003)- 民主党 (Democratic Party of Japan) (1998-2016)
国民新党 (People's New Party) (2005-2013)- みんなの党 (Your Party) (2009-2014)
- 太陽の党 (Sunrise Party) (2010-2012)
- 日本未来の党 (Tomorrow Party of Japan (2012-2013)
日本維新の会 (Japan Restoration Party) (2012-2014)- 自由党 (Liberal Party) (2012-2019)
- 結いの党 (Unity Party) (2013-2014)
- 維新の党 (Japan Innovation Party) (2014-2016)
- 日本のこころ (Party for Japanese Kokoro) (2014-2018)
民進党 (Democratic Party) (2016-2018)
Empire of Japan
愛国公党 (Public Party of Patriots) (1874 - 1875)- 愛国社 (Society of Patriots) (1875)
- 立憲帝政党 (Constitutional Imperial Rule Party) (1882 - 1883)
- 自由党 (Liberal Party) (1890 - 1898)
進歩党 (Progressive Party) (1896 - 1898)
憲政党 (Constitutional Party) (1898 - 1900)
立憲政友会 (Association of Friends of Constitutional Government) (1900 - 1940)
双葉会(陸軍) (Double Leaf Society) (1907 - 1916)- 皇道派 (Imperial Way Faction) (1920s - 1936)
統制派 (Control Faction) (1920s - 1936)
艦隊派 (Fleet Faction) (1921 - 1934)
条約派 (Treaty Faction) (1921 - 1936)
革新倶楽部 (Reformist Club) (1922 - 1925)- 国本社 (National Foundation Society) (1924 - 1936)
- 社会民衆党 (Social Democratic Party) (1926 - 1932)
日本労農党 (Japan Labour-Farmer Party) (1926 - 1928)- 労働農民党 (Labour-Farmer Party) (1926 - 1928)
- 立憲民政党 (Constitutional Democratic Party) (1927 - 1940)
- 桜会 (Cherry Blossom Society) (1930 - 1931)
社会大衆党 (Social Mass Party) (1932 - 1940)
国民同盟 (National Citizens' Alliance) (1932 - 1940)- 東方会 (Society of the East) (1936 - 1944)
- 大政翼贊會/大政翼賛会 (Imperial Rule Assistance Association) (1940 - 1945)
- 大日本青年党 (Great Japan Youth Party) (1937 - 1945)
- 大日本翼賛壮年団 (Imperial Rule Assistance Young Men's Corps) (1942 - 1945)
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- ↑ The Democratic Party for the People official ideology is "Reformist Centrism"