# List of left-wing internationals

This is a list of socialist, communist, and anarchist, and other left-wing internationals. An "International" — such as, the "First International", the "Second International", or the "Socialist International" — may refer to a number of multi-national communist, radical liberal, socialist, or organized labour organizations, typically composed of national sections.

## Existing internationals
### Global internationals
#### Progressive, social democratic, anti-capitalist, and socialist internationals

* Socialist International (Democratic socialism, Social democracy)
* Progressive Alliance (Progressivism)
* Progressive International (Progressivism, Anti-capitalism)
* International Peoples' Assembly (Progressivism, Anti-capitalism)
* Horizon Federation (Libertarian socialism)

#### Classical Marxist and left-communist internationals

* 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

#### Anarchist internationals

* International of Anarchist Federations (Synthesis anarchism, Anarchism without adjectives)
* International Workers' Association (Anarcho-syndicalism)
* International Confederation of Labour (Anarcho-syndicalism)
* anarkismo.net (Anarcho-communism, platformism)

#### Marxist–Leninist, Maoist and Hoxhaist internationals

* 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)

#### Trotskyist, Posadist and post-Trotskyist internationals

* Committee for a Workers' International (Trotskyist) – claims to be refoundation of Committee for a Workers' International (1974)
* Committee for Revolutionary International Regroupment (Trotskyist)
* Fourth International (reunified) (Trotskyist)
* International Committee of the Fourth International (Trotskyist)
* International Committee of the Fourth International (Trotskyist) – associated with the Workers Revolutionary Party
* International Communist League (Fourth Internationalist) (Trotskyist) – previously known as the International Spartacist Tendency
* Revolutionary Communist International (Trotskyist) – previously known as the International Marxist Tendency and the Committee for a Marxist International
* International Revolutionary Left (Trotskyist)
* International Socialist Alternative (Trotskyist) – claims to be successor to Committee for a Workers' International (1974)
* International Socialist Tendency (Post-Trotskyist)
* Internationalist Communist Union (Trotskyist)
* International Trotskyist Committee for the Political Regeneration of the Fourth International (Trotskyist)
* International Workers League – Fourth International (Trotskyist)
* International Workers' Unity – Fourth International (Trotskyist)
* League for the Fifth International (Trotskyist)
* League for the Fourth International (Trotskyist)
* League for the Revolutionary Party – Communist Organization for the Fourth International (Trotskyist)
* Organising Committee for the Reconstitution of the Fourth International (Trotskyist)
* Trotskyist Fraction – Fourth International (Trotskyist)
* Workers International to Rebuild the Fourth International (Trotskyist)
* International Bolshevik Tendency (Trotskyist)
* Bolshevik Tendency (Trotskyist)
* International Leninist Trotskyist Tendency (Trotskyist)
* Permanent Revolution Collective (Trotskyist)
* International Leninist Trotskyist Fraction (Trotskyist)
* Tendency for the Reconstruction of the Fourth International (Trotskyist)
* Internationalist Trotskyist Nucleus-Fourth International (Trotskyist)
* Fourth International Posadist (Posadist)
* Liaison Committee for the Reconstruction of the Fourth International (Trotskyist)

#### Anti-imperialist internationals

* International League of Peoples' Struggle
* World Anti-Imperialist Platform

#### Green and ecologist internationals

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

### Regional internationals

* 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)
* European Communist Action (Marxism–Leninism, Europe)

## Defunct internationals

* 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 ("3½ International") (Centrist Marxism, 1932–1940s)
* Fourth International (Trotskyism, 1938–1953)
* Revolutionary Workers Ferment (Left communism, 1948–unknown)
* Situationist International (Situationism, 1957–1971)
* International League for the Reconstruction of the Fourth International (Trotskyism, 1973–1995)
* 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)