List of left-wing internationals

• Socialist International (Democratic socialism, Social democracy)
• Progressive Alliance (Progressivism)
• Progressive International (Progressivism, Anti-capitalism)
• International Peoples' Assembly (Progressivism, Anti-capitalism)

• World Socialist Movement (Classical Marxism)
• International Communist Current (Left communism)
• International Communist Party (Left communism)
• Internationalist Communist Tendency (Left communism)

See also: Internationalist Communist Party and Communist Workers' Organisation

• International of Anarchist Federations (Synthesis anarchism, Anarcho-communism)
• International Workers' Association (Anarcho-syndicalism)
• International Confederation of Labour (Anarcho-syndicalism)
• anarkismo.net (Anarcho-communism, platformism)

• International Meeting of Communist and Workers' Parties (Marxism–Leninism)
• International Coordination of Revolutionary Parties and Organizations (Marxism–Leninism)
• International Conference of Marxist–Leninist Parties and Organizations (Unity & Struggle) (Hoxhaism)
• International Communist League (Marxism–Leninism–Maoism, Gonzalo Thought)

• Committee for a Workers' International (Trotskyist) – claims to be refoundation of Committee for a Workers' International (1974)^[1]
• Committee for Revolutionary International Regroupment^[2] (Trotskyist)
• Fourth International (reunified)^[3] (Trotskyist)
• International Committee of the Fourth International^[4] (Trotskyist)
• International Committee of the Fourth International^[5] (Trotskyist) – associated with the Workers Revolutionary Party
• International Communist League (Fourth Internationalist)^[6] (Trotskyist) – previously known as the International Spartacist Tendency
• Revolutionary Communist International^[7] (Trotskyist) – previously known as the International Marxist Tendency and the Committee for a Marxist International
• International Revolutionary Left^[8] (Trotskyist)
• International Socialist Alternative^[9] (Trotskyist) – claims to be successor to Committee for a Workers' International (1974)
• International Socialist Tendency^[10] (Post-Trotskyist)
• Internationalist Communist Union^[11] (Trotskyist)
• International Trotskyist Committee for the Political Regeneration of the Fourth International^[12] (Trotskyist)
• International Workers League – Fourth International^[13] (Trotskyist)
• International Workers' Unity – Fourth International^[14] (Trotskyist)
• League for the Fifth International^[15] (Trotskyist)
• League for the Fourth International^[16] (Trotskyist)
• League for the Revolutionary Party – Communist Organization for the Fourth International^[17] (Trotskyist)
• Organising Committee for the Reconstitution of the Fourth International^[18] (Trotskyist)
• Trotskyist Fraction – Fourth International^[19] (Trotskyist)
• Workers International to Rebuild the Fourth International^[20] (Trotskyist)
• International Bolshevik Tendency^[21] (Trotskyist)
• Bolshevik Tendency^[22] (Trotskyist)
• International Leninist Trotskyist Tendency^[23] (Trotskyist)
• Permanent Revolution Collective^[24] (Trotskyist)
• International Leninist Trotskyist Fraction^[25] (Trotskyist)
• Tendency for the Reconstruction of the Fourth International^[26] (Trotskyist)
• Internationalist Trotskyist Nucleus-Fourth International^[27] (Trotskyist)
• Fourth International Posadist^[28] (Posadist)
• Liaison Committee for the Reconstruction of the Fourth International (Trotskyist)

• International League of Peoples' Struggle
• World Anti-Imperialist Platform^[29]

• World Ecological Parties (Ecologist)
• Global Greens (Green)

• Communist Party of the Soviet Union (2001) (Marxism–Leninism, Post-Soviet states)
• Coordination Committee of Maoist Parties and Organisations of South Asia (Maoism, South Asia)
• European Anti-Capitalist Left (Democratic socialism, Europe)
• Foro de São Paulo (Anti-neoliberalism, Latin America)
• Now the People (Democratic socialism, Europe)
• Party of the European Left (Socialism, Europe)
• Permanent Conference of Political Parties of Latin America and the Caribbean (Leftism, Latin America and the Caribbean)
• Union of Communist Parties – Communist Party of the Soviet Union (Marxism–Leninism, Post-Soviet states)
• Conference of Communist and Worker's Parties of the Balkans (Marxism–Leninism, Balkans)^[30]
• European Communist Action (Marxism–Leninism, Europe)^[31]

• League of the Just (Christian communism, 1839–1847)
• Communist League (Marxism, 1847–1852)
• International Workingmen's Association ("First International") (Marxism, 1864–1876)
• Anarchist St. Imier International, (Collectivist anarchism, 1872–1877)
• International Working People's Association ("Black International") (Insurrectionary anarchism, Anarcho-collectivism, Anarcho-communism, 1881–1887)
• Second International (Marxism, 1889–1916)
• International Working Union of Socialist Parties ("2½ International") (Centrist Marxism, 1921–1923)
• Communist International ("Third International") (Marxism–Leninism, 1919–1943)
• Communist Workers' International (Council communism (1922–mid-1920s)
• Labour and Socialist International (Socialism, 1923–1940)
• International Revolutionary Marxist Centre ("2½ International") (Centrist Marxism, 1932–1940s)
• Revolutionary Workers Ferment (Left communism, 1948–unknown)
• Situationist International (Situationism, 1957–1971)
• International League for the Reconstruction of the Fourth International (Trotskyism, 1973–1995)^{[citation needed]}
• Committee for a Workers' International (Trotskyism, 1974–2019)
• Trotskyist International Liaison Committee (Trotskyism, 1979–1984)
• Revolutionary Internationalist Movement (Marxism–Leninism–Maoism, 1984–2012)
• International Communist Seminar (Marxism–Leninism, 1992–2014)
• International Libertarian Solidarity (Anarchism, 2001–2005)
• International Conference of Marxist–Leninist Parties and Organizations (International Newsletter) (Marxism–Leninism, Mao Zedong Thought, 1988–2017)
• Coordinating Committee for the Refoundation of the Fourth International (Trotskyism, 2004–2017)
• Initiative of Communist and Workers' Parties (Marxism–Leninism, Europe, 2013–2023)

• List of Trotskyist internationals
• Fifth International
• List of international labor organizations
• Political international

• Media related to Left-wing internationals at Wikimedia Commons
• Lists of leftist organisations