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The following is a list of Trotskyist organizations by country. This article lists only those currently existing parties which self-identify ideologically as Trotskyist. Included are Trotskyist factions, but not youth organizations or party alliances.
Algeria – Socialist Workers Party, Workers' Party 
Argentina – Movement for Socialism, Self-determination and Freedom, Socialist Left, Socialist Workers' Party, United Socialist Workers' Party, Workers' Party, Workers' Socialist Movement 
Australia – Socialist Alternative, Socialist Equality Party, Solidarity, Spartacist League, [1] Workers' Liberty Australia, Freedom Socialist Party 
Austria – Left Turn, Socialist Left Party, The Spark, Workers Viewpoint 
Azerbaijan – HAQİQAT
Bangladesh – Communist Party of Bangladesh (Marxist–Leninist) (Section of the Fourth International)
Belgium – International Workers' League, Left Socialist Party, Anticapitalist Left 
Bolivia – Revolutionary Worker League – Fourth International, Revolutionary Workers Party, Workers' Socialist Movement 
Botswana – International Socialist Organization 
Brazil – Centelhas, [2] Ecosocialist Rebellion, [3] Freedom, Socialism and Revolution (LSR), Insurgência, Internationalist Communist Organization, [4] Revolutionary Regroupment, [5] Revolutionary Workers' Party, [6] Socialist Left Movement, Socialist Revolution, [7] Subverta, [2] United Socialist Workers' Party, Workers' Cause Party, Workers' Revolutionary Movement, Workers' Socialist Current 
Canada – International Socialists, Socialist Action, Socialist Alternative, Revolutionary Communist Party, Trotskyist League in Quebec [8] and Canada [9] 
China – China Worker [10] 
Chile – Revolutionary Workers Party, Movimiento Anticapitalista, [11] 
Colombia – Presents for Socialism 
Costa Rica – New Socialist Party, Socialist Organization, Workers' Party 
Cyprus – New Internationalist Left, Workers' Democracy 
Czech Republic – Marxist Alternative, Socialist Alternative Future, Socialist Organisation of Working People, Socialist Solidarity,
Denmark – International Socialists, Socialist Workers Party, Revolutionary Socialists (IMT) 
Egypt – Revolutionary Socialists 
Finland – Marxist Workers' League, Socialist Alternative 
France – Révolution Permanente, Independent Workers' Party, New Anticapitalist Party, Revolutionary Left, Trotskyist League of France, Workers' Struggle (See Trotskyism in France)
Germany – The Spark, Revolutionary Internationalist Organisation, Socialist Equality Party, Socialist Alternative, Socialist Organisation 'Solidarity', Workers' Power, Spartakist-Arbeiterpartei [12] 
Ghana – International Socialist Organisation 
Greece – Internationalist Workers' Left, Organisation of Internationalist Communists of Greece, Organization of Communist Internationalists of Greece–Spartacus, Socialist Workers' Party, Start – Socialist Internationalist Organisation, Trotskyist Group of Greece, [13] Workers Revolutionary Party 
India – Radical Socialist, [14] New Socialist Alternative, Workers' Socialist Party
Indonesia – Perhimpunan Sosialis Revolusioner, [15] Angkatan Bolshevik Revolusioner Internasionalis (ABRI) [16] 
Iran – Socialist Workers' Party of Iran 
Ireland – People Before Profit, Solidarity, Socialist Party, Socialist Workers Network, Militant Left
Israel and 
Palestine – Socialist Struggle Movement 
Italy – Left Classe Revolution, [17] Workers' Communist Party, Communist Alternative Party, Anticapitalist Left 
Ivory Coast – Militant Côte d'Ivoire
Japan – Japan Revolutionary Communist League, Spartacist Group Japan, [18] Japan Revolutionary Communist League (Revolutionary Marxist Faction) 
South Korea – Workers' Solidarity, Bolshevik Group, [19] March To Socialism [20] 
Lebanon – Revolutionary Communist Group 
Malaysia – Socialist Alternative
Mexico – Socialist Workers Movement 
Netherlands – Socialist Alternative Politics, Socialist Alternative, International Socialists, Vonk (Revolutionary Communist International)
New Zealand – International Socialist Organisation, Socialist Voice, Socialist Aotearoa, Communist Workers Group [21] 
Nicaragua – Workers' Revolutionary Party 
Nigeria – Democratic Socialist Movement, Movement for a Socialist Alternative 
Norway – Internationalist League of Norway 
Pakistan – Socialist Movement Pakistan, The Struggle Pakistan 
Paraguay – Workers' Party 
Peru – Workers' Revolutionary Party, Socialist Workers Party, Socialist Workers Party (1992)
Poland – Socialist Alternative, Workers' Democracy 
Portugal – Revolutionary Socialism, Socialist Alternative Movement 
Romania – Hand of Labour, [22] The Scientific Communism, [23] Socialist Action Group [24] 
Russia – Organisation of Commujucheistlutionary Workers' Party, Russian Socialist Movement, Socialist Alternative, Socialist Tendency
South Africa – Spartacist South Africa, [25] Workers and Socialist Party, Workers International Vanguard Party, Keep Left, African Peoples' Democratic Union of Southern Africa, International Socialist Movement, Non-European Unity Movement 
Spain – Revolutionary Workers' Party, Internationalist Struggle, Red Current, Workers' Revolutionary Current, Revolutionary Left, Revolutionary Socialism, Anticapitalistas, Internationalist Socialist Workers' Party, Revolutionary Anticapitalist Left 
Sri Lanka – Lanka Equal Society Party, Lanka Equal Society Party (Alternative Group), New Equal Society Party, United Socialist Party, Socialist Party of Sri Lanka, Socialist Equality Party, Revolutionary Workers Party 
Sudan – Socialist Alternative
Sweden – Socialist Party, Socialist Alternative, International Socialists, Workers' Power 
Switzerland – Solidarity, The Spark
Taiwan – International Socialist Forward, The Spark(IMT Taiwan)
Thailand – Socialist Workers Thailand
Togo – Workers' Party 
Tunisia – Socialist Alternative, Workers' Left League 
Turkey – Revolutionary Workers' Party, Revolutionary Socialist Workers' Party, New Way, Socialist Alternative, Workers' Fraternity Party 
Ukraine – Commune, [26] Social Movement, Ukrainian Socialist League
United Kingdom – Alliance for Workers' Liberty, Communist League, International Socialist League, Workers' Power, Socialist Action, Socialist Appeal, Socialist Equality Party, Socialist Resistance, Socialist Workers' Party, Spartacist League, Workers' Fight, Workers International to Rebuild the Fourth International, Workers Revolutionary Party, Socialist Alternative, Revolutionary Communist Party 
United States – Revolutionary Communists of America [27] (RCI), Socialist Alternative, Socialist Action, Socialist Equality Party, Freedom Socialist Party, Fourth International Caucus, Internationalist Group, Reform and Revolution, Spartacist League, Socialist Workers Organization, Socialist Organizer, The Left Party US, Left Voice, [28] Spark, Revolutionary Workers League, Workers' Voice, Communist Workers Group [29] 
Uruguay – Workers' Party, International Socialism; Revolutionary Workers' Party, Fourth International Posadist, Current of Workers for Socialism
Venezuela – Revolutionary Socialism, Revolutionary Marxist Current, League of Workers for Socialism
Zimbabwe – International Socialist Organisation
The League for the Fourth International (LFI) is a Trotskyist international organization that has sections in Mexico, Brazil, Italy, the United States and Germany. All of these are very small and based in at most one or two cities. Like other international Trotskyist groups, it fights for "international socialist revolution, the conquest of power by the working class, led by its Leninist party."
The Trotskyist Fraction – Fourth International (TF-FI) is a political international of Trotskyist political organizations that claim to adhere to the political legacy of the Fourth International.
James Robertson (1928–2019) was the long-time and founding National Chairman of the Spartacist League (US), the original national section of the International Communist League. In his later years, Robertson was consultative member of the ICL's international executive committee.
Trotskyism in Vietnam was represented by those who, in left opposition to the Indochinese Communist Party (ICP) of Hồ Chí Minh, identified with Trotskyism to re-found "vanguard parties of proletariat" on principles of "proletarian internationalism" and of "permanent revolution". Active in the 1930s in organising the Saigon waterfront, industry and transport, Trotskyists presented a significant challenge to the Moscow-aligned party in Cochinchina. Following the September 1945 Saigon uprising against the restoration of French colonial rule, Vietnamese Trotskyists were systematically hunted down and eliminated by both the French Sûreté and the Communist-front Viet Minh.
The Revolutionary Workers League (RWL) is a Trotskyist political party in the United States. RWL formed in the late 1970s, when its members split from the Spartacist League/U.S.. RWL still has about 20 active members.
The Spartacist League/U.S. is a Trotskyist political grouping which is the United States section of the International Communist League, formerly the International Spartacist Tendency. This Spartacist League named themselves after the original Spartacus League of Weimar Republic in Germany, but has no formal descent from it. The League self-identifies as a "revolutionary communist" organization.
The International Socialist Group (ISG) was a Trotskyist organisation in Britain. It was the British section of the Fourth International (FI) until 2009 when it dissolved into Socialist Resistance.
The International Committee of the Fourth International (ICFI) is a public faction of the Fourth International founded in 1953. Today, two Trotskyist internationals claim to be the continuations of the ICFI; one with sections named Socialist Equality Party which publishes the World Socialist Web Site, and another linked to the Workers Revolutionary Party in the UK.
The International Marxist Group (IMG) was a Trotskyist group in Britain between 1968 and 1982. It was the British Section of the Fourth International. It had around 1,000 members and supporters in the late 1970s. In 1980, it had 682 members; by 1982, when it changed its name to the Socialist League, membership had fallen to 534.
The Fourth International (FI), founded in 1938, is a Trotskyist international.
The International Communist League (Fourth Internationalist) abbreviated as ICL(FI), earlier known as the international Spartacist tendency (iSt) is a Trotskyist international. Its largest constituent party is the Spartacist League (US). There are smaller sections of the ICL (FI) in Mexico, Canada, France, Germany, Ireland, Italy, Japan, South Africa, Australia, Greece and the United Kingdom.
The phrase Fifth International refers to the efforts made by groups of socialists and communists to create a new workers' international.
Orthodox Trotskyism is a branch of Trotskyism which aims to adhere more closely to the philosophy, methods and positions of Leon Trotsky and the early Fourth International, Vladimir Lenin and Karl Marx than other avowed Trotskyists.
Anticapitalistas, known as Izquierda Anticapitalista until January 2015 and as Espacio Alternativo from 1995 to November 2008, is a socialist political organisation that works as a confederation in Spain. Anticapitalistas is defined as a revolutionary socialism, anti-capitalist, proletarian internationalist, republican, and eco-socialist organisation, assuming Marxism in an open, plural, and critical sense. Its stated objective is the rebuilding of the revolutionary project through the creation of a unitary, anti-capitalist political expression sustained by the anti-globalisation movement, the labor movement, and the social movements at large. It is a member of the Fourth International (post-reunification), a Trotskyist international organisation reformed in 1963.
Far-left politics in the United Kingdom have existed since at least the 1840s, with the formation of various organisations following ideologies such as Marxism, revolutionary socialism, communism, anarchism and syndicalism.
The International Bolshevik Tendency is an international Trotskyist organisation.
