| Socialist Party of Albania (PSS) |  Albania | member of Socialist International[1] |
| Social Forces Front (FFS) |  Algeria | member of Socialist International |
| Movimento Popular de Libertação de Angola - Partido do Trabalho |  Angola | |
| Partido Socialista |  Argentina | member of Socialist International |
| Australian Labour Party |  Australia | member of Socialist International |
| Social Democratic Party of Austria (SPO) |  Austria | member of Socialist International |
| Eusko Alkartasuna (EA) |  Basque Country |
| Comité voor een Andere Politiek - Comité pour une Autre Politique (CAP) | .svg.png) Belgium | |
| Socialist Party (Belgium) (PS) | Belgium | member of Socialist International |
| Movimiento al Socialismo (MAS) |  Bolivia | member of Socialist International |
| Revolutionary Left Movement (Bolivia) (MIR) | Bolivia | member of Socialist International |
| Partido Democrático Trabalhista (PDT) (Democratic Workers Party) |  Brazil | member of Socialist International |
| Partido da Social Democracia Brasileira (PSDB) | Brazil | |
| Partido Socialista Brasileiro (PSB) | Brazil | |
| Partido da Mobilização Nacional (PMN) | Brazil | |
| Partido Socialismo e Liberdade (P-SOL) | Brazil | |
| Partido Popular Socialista (PPS) | Brazil | |
| Partido Socialista dos Trabalhadores Unificado (PSTU) | Brazil | |
| Partido da Causa Operária (PCO) | Brazil | |
| Partido dos Trabalhadores (PT) | Brazil | |
| New Democratic Party of Canada (NDP) |  Canada | member of Socialist International |
| Socialist Party of Canada (WSM) (SPC) | Canada | Libertarian socialism, internationalism, Left communism |
| Popular Unity Candidates (CUP) |  Catalonia | Catalan independentism, Libertarian socialism, Direct Democracy |
| Concert of Parties for Democracy (Concertación de Partidos por la Democracia) |  Chile | coalition of member parties of Socialist International |
| Colombian Liberal Party (PLC) |  Colombia | member of Socialist International |
| National Liberation Party (Costa Rica) (PLN) |  Costa Rica | member of Socialist International |
| Socijalistička radnička partija Hrvatske (SRP) |  Croatia | |
| Democratic Social-Revolutionary Party of Cuba |  Cuba | |
| Czech Social Democratic Party (CSSD) |  Czech Republic | member of Socialist International |
| Red-Green Alliance (Denmark) (Enhedslisten) |  Denmark | |
| Social Democrats (Socialdemokraterne) | Denmark | member of Socialist International |
| Alianza PAIS (Patria Altiva I Soberana) |  Ecuador | |
| Frente Farabundo Martí para la Liberación Nacional (FMLN) |  El Salvador | |
| European United Left - Nordic Green Left (EUL/NGL) |  European Union | partially communist |
| European Left | European Union | |
| Left Independent Republicans (Faroe Islands) (Tjóðveldi) |  Faroe Islands | "Self-governed part of the Kingdom of Denmark" |
| Fiji Labour Party (FLP) |  Fiji | |
| Vasemmistoliitto (VAS) |  Finland | |
| Parti Socialiste (PS) |  France | member of Socialist International |
| Die Linke |  Germany | |
| Social Democratic Party of Germany (SPD) | Germany | member of Socialist International |
| Panhellenic Socialist Movement (PASOK) |  Greece | member of Socialist International |
| Global Labour Institute | international | Switzerland, USA, UK and Russia |
| Indian National Congress |  India | |
| Samajwadi Party | India | |
| Organization of Iranian People's Fedaian (Majority) |  Iran | |
| Irish Republican Socialist Party (IRSP) |  Ireland | socialism, Irish Republicanism |
| Labour Party (Páirtí an Lucht Oibre) | Ireland | member of Socialist International |
| Sinn Féin | Ireland | democratic socialism, social democracy, Irish Republicanism |
| Social Democratic and Labour Party (SDLP) |  Northern Ireland | social democracy, Irish nationalism |
| Habonim Dror |  Israel (worldwide) | labour Zionist youth movement |
| Labor Party (Israel) | Israel | member of Socialist International |
| Meretz-Yachad | Israel | democratic socialism, Labor Zionism, member of Socialist International |
| Democratic Party |  Italy | |
| Democratic Party |  Japan | |
| Social Democratic Party (Japan) (SDPJ) | Japan | member of Socialist International |
| Democratic Labor Party (DLP) |  South Korea | |
| Socialist Party of Macedonia |  Macedonia | |
| Parti Tindakan Demokratik |  Malaysia | |
| Partido de la Revolución Democrática (PRD) |  Mexico | member of Socialist International |
| Demokratska Partija Socijalista Crne Gore (DPS) |  Montenegro | |
| Nepali Congress |  Nepal | member of Socialist International |
| Socialistische Partij (SP) |  Netherlands | |
| Progressive Party |  New Zealand | coalition partner with the NZ Labour Party, progressivism, democratic socialism |
| Frente Sandinista de Liberación Nacional (FSLN) |  Nicaragua | member of Socialist International |
| Labour Party (A) |  Norway | observer of Socialist International |
| Sosialistisk Venstreparti (SV) | Norway | |
| Pakistan Peoples Party |  Pakistan | member of Socialist International |
| Fatah |  Palestine | member of Socialist International |
| Partido Socialista |  Peru | |
| Sojusz Lewicy Demokratycznej (SLD) |  Poland | member of Socialist International |
| Młodzi Socjaliści | Poland | |
| Partido Socialista (PS) |  Portugal | member of Socialist International |
| Puerto Rico Independence Party (PIP) |  Puerto Rico | member of Socialist International |
| Parti Québécois (PQ) |  Quebec | social democracy, neo-liberalism, Quebec nationalism, separation of Quebec |
| Québec Solidaire (QS) | Quebec | democratic socialism, altermondialism, separation of Quebec |
| A Just Russia (Справедливая Россия) (CP) |  Russia | member of Socialist International |
| Scottish Socialist Party (SSP) |  Scotland | socialism, Scottish nationalism |
| Scottish National Party (SNP) | Scotland | Social Democracy, Scottish nationalism |
| People's Action Party (PAP) |  Singapore | |
| Workers' Party of Singapore (WP) | Singapore | |
| Initiative for Democratic Socialism (Iniciativa za demokratični socializem) |  Slovenia | |
| Somali Salvation Democratic Front (SSDF) |  Somalia | |
| African National Congress |  South Africa | member of Socialist International |
| Spanish Socialist Workers Party (PSOE) |  Spain | member of Socialist International |
| United Left (IU) | Spain | |
| United People's Freedom Alliance |  Sri Lanka | |
| Unionist National Party |  Sudan | |
| Left Party (Sweden) (V) |  Sweden | |
| Social Democratic Party (Sweden) (SAP or S) | Sweden | member of Socialist International |
| Socialist Justice Party (RS) | Sweden | Trotskyism, socialism, internationalism |
| Socialist Party (Sweden, 1971) (SP) | Sweden | |
| Republican People's Party (CHP) |  Turkey | member of Socialist International |
| Social Democratic Party of Ukraine (SDPU)/Ukraine - Forward! |  Ukraine | |
| Labour Party |  United Kingdom | |
| Socialist Party of Great Britain (SPGB) | United Kingdom | Libertarian socialism, Orthodox Marxism, Impossiblism |
| Committees of Correspondence for Democracy and Socialism |  United States | does not run candidates in elections |
| Democratic Socialists of America (DSA) | United States | does not run candidates in elections, member of Socialist International |
| Green Party of the United States (GPUS) | United States | |
| Liberty Union Party | United States | runs candidates in Vermont |
| Peace and Freedom Party (PFP) | United States | runs candidates in California |
| Socialist Alternative (SA) | United States | Runs candidates in local elections, Trotskyist, member of Committee for a Workers' International |
| Socialist Party USA (SPUSA) | United States | |
| Socialist Workers Movement (Movimiento Socialista de Trabajadores) (MST) | United States | active in Puerto Rico |
| Solidarity (US) | United States | does not run candidates in elections |
| Partido Socialista Unido de Venezuela (PSUV) |  Venezuela | democratic socialism, Bolivarianism |
| Plaid Cymru |  Wales | Welsh nationalism/Social Democracy |
| Movement for Democratic Change |  Zimbabwe | member of Socialist International |