 |
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| Socialist International | |
|---|---|
 Countries with members of Socialist International |
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| Abbreviation | SI |
| Predecessor | Labour and Socialist International |
| Formation | 3 June 1951; 68 years ago (1951-06-03) |
| Type | International non-governmental organisation |
| Purpose/focus | "Strengthen relations between the affiliated parties and to coordinate their political attitudes and activities" |
| Location | London, SW4 United Kingdom |
| Region served | Worldwide |
| Membership | 147 |
| President | George Papandreou |
| Secretary General | Luis Ayala [Wikidata] |
| Main organ | Congress of the Socialist International |
| Budget | £1.4 million (2014) |
| Website | socialistinternational |
The Socialist International (SI) is a worldwide group which wants to establish democratic socialism. Most of its members are democratic socialist, social democratic, and labour political parties.
Its name is from the Second International, which was formed in 1889 and dissolved on the eve of World War I in 1914.
Some of the Second International's most famous actions were its 1889 declaration of 1 May as International Labour Day and its 1910 declaration of 8 March as International Women's Day. The Second International was split by the outbreak of World War I. A small part carried on as the International Socialist Commission. The International re-formed in 1923 (as the Labour and Socialist International), and was re organised again, in its present form, after World War II. Many social democratic and socialist parties had been suppressed in Nazi-occupied Europe.
Since World War II, the SI helped social democratic parties to re-start themselves when dictatorship gave way to democracy in Portugal (1974) and Spain (1975).
Until its 1976 Geneva Congress, the Socialist International had few members outside Europe and no formal involvement with Latin America. In the 1980s, most SI parties gave their backing to the Nicaraguan Sandinistas (FSLN), whose left-wing government had incited hatred from the United States. Since then, the SI has admitted as member-parties not only the FSLN but also the centre-left Puerto Rican Independence Party, as well as the ex-Communist parties such as the Italian Democrats of the Left (Democratici di Sinistra (DS)) and the Front for the Liberation of Mozambique (FRELIMO).
The Party of European Socialists, a European political party active in the European Parliament, is an associated organisation of the Socialist International.
In 2006, George Papandreou, leader of the Panhellenic Socialist Movement, became the president of the Socialist International.
The following parties are full members:
| Country | Name | Abbr | Government | Notes |
|---|---|---|---|---|
 Albania |
Socialist Party of Albania | PS | in government | Admitted as consultative member in 1999. Promoted to full member in 2003. |
 Algeria |
Socialist Forces Front | FFS | in opposition | Admitted as consultative member in 1992. Promoted to full member in 1996. |
 Andorra |
Social Democratic Party | PS | in opposition | Promoted to full member in 2003. |
 Angola |
Popular Movement for the Liberation of Angola | MPLA | in government | Admitted as observer member in 1996. Promoted to full member in 2003. |
 Argentina |
Radical Civic Union | UCR | junior party in coalition | Admitted as consultative member in 1996. Promoted to full member in 1999. |
 Armenia |
Armenian Revolutionary Federation | ARF | junior party in coalition | Admitted (as Armenian Socialist Party) as observer member in 1996. Promoted (as ASP) to consultative member in 1999. Promoted (as ASP) to full member in 2003. |
 Austria |
Social Democratic Party of Austria | SPÖ | in opposition | Full member since 1951. |
 Azerbaijan |
Social Democratic Party | ASDP | in opposition | Admitted as observer member in 1996. Promoted to consultative member in 2003. Readmitted as consultative member in June/July 2014. Admitted as full member in 2016. |
 Belarus |
Belarusian Social Democratic Party | BSDP | in opposition | Admitted as observer member in 1999. Promoted to consultative member in 2003. Promoted to full member in November 2015. |
 Belgium |
Socialist Party | PS | in opposition | |
 Bosnia and Herzegovina |
Social Democratic Party of Bosnia and Herzegovina | SDP BiH | in opposition | Admitted as observer member in 1996. Promoted to full member in 1999. |
 Brazil |
Democratic Labour Party | PDT | in opposition | Admitted as consultative member in 1986. Promoted to full member in 1989. |
 Bulgaria |
Party of Bulgarian Social Democrats | PBSD | in opposition | |
| Bulgaria |
Bulgarian Socialist Party | BSP | in opposition | Admitted as full member in 2003. |
 Burkina Faso |
People's Movement for Progress | MPP | in government | Admitted as full member in 2016. |
 Cameroon |
Social Democratic Front | SDF | in opposition | Admitted as consultative member in 1996. Promoted to full member in 1999. |
 Cape Verde |
African Party for the Independence of Cape Verde | PAICV | in opposition | Admitted as consultative member in 1992. Promoted to full member in 1996. |
 Central African Republic |
Movement for the Liberation of the Central African People | MLPC | in opposition | Admitted as observer member in 2008. Upgraded to full member in 2018. |
 Chad |
National Union for Democracy and Renewal | UNDR | in opposition | Admitted as observer member in June/July 2014. Upgraded to full member in 2017. |
 Chile |
Party for Democracy | PPD | in opposition | Admitted as consultative member in 1992. Promoted to full member in 1996. |
| Chile |
Radical Social Democratic Party | PRSD | in opposition | |
| Chile |
Socialist Party of Chile | PS | in opposition | Admitted as consultative member in 1992. Promoted to full member in 1996. |
 Colombia |
Colombian Liberal Party | PLC | in coalition | Admitted as consultative member in 1992. Promoted to full member in 1999. |
 Costa Rica |
National Liberation Party | PLN | in opposition | Full member since 1987. |
 Croatia |
Social Democratic Party of Croatia | SDP | in opposition | Admitted as full member in 1999. |
 Cyprus |
Movement for Social Democracy | EDEK | in opposition | Full member since 1987. Promoted to full member in 1992. |
  Cyprus (North) |
Republican Turkish Party | CTP | in opposition | Admitted as consultative member in 2008 (pending consultation). Promoted to full member in June/July 2014. |
| Cyprus (North) |
Communal Democracy Party | TDP | in opposition | Admitted as consultative member in November 2015. Promoted to full member in March 2017. |
 Czech Republic |
Czech Social Democratic Party | ČSSD | junior party in coalition | |
 Democratic Republic of the Congo |
Union for Democracy and Social Progress | UDPS | in opposition | Admitted as observer member in 2003. |
 Dominican Republic |
Dominican Revolutionary Party | PRD | junior party in coalition | Full member since 1987. |
 Equatorial Guinea |
Convergence for Social Democracy | CPDS | in opposition | Admitted as consultative member in 1996. Promoted to full member in 1999. |
 Finland |
Social Democratic Party of Finland | SDP | in government | |
 France |
Socialist Party | PS | in opposition | |
 Ghana |
National Democratic Congress | NDC | in opposition | Admitted as consultative member in 2003. Promoted to full member in 2008. |
 Greece |
Movement for Change | in opposition | Full member since 1990. | |
 Guatemala |
National Unity of Hope | UNE | in opposition | Admitted as full member in 2008. |
| Template:GIN | Rally of the Guinean People | RPG | in government | Admitted (as Guinean People's Assembly) as consultative member in 1999. Promoted (as GPA) to full member in 2003. |
 Haiti |
Fusion of Haitian Social Democrats | PFSDH | in opposition | Full member since 1989. |
| Haiti |
Social Democratic Assembly for the Progress of Haiti (RSD) | RSD | in opposition | Admitted as full members in 2018 |
 Hungary |
Hungarian Socialist Party | MSzP | in opposition | Admitted as observer member in 1992. Promoted to full member in 1996. |
| Hungary |
Social Democratic Party of Hungary | MSZDP | extra-parliamentary | Member since 1990. Admitted as observer member in 1992. Promoted to consultative member in 1999. Promoted to full member in 2003. |
 India |
Indian National Congress | INC | in opposition | Originally joined in 1993. Readmitted as full member December 2014. |
 Iran |
Kurdistan Democratic Party | KDP | N/A | Admitted as a full member in November 2015. |
 Iraq |
Patriotic Union of Kurdistan | PUK | in government | Admitted as observer member in 2003. Promoted to full member in 2008. |
 Ireland |
Labour Party | in opposition | ||
 Israel |
Israeli Labour Party | Avoda | in opposition | Temporarily suspended membership in July 2018 over SI's adoption of BDS policies. |
| Israel |
Meretz | in opposition | ||
 Italy |
Italian Socialist Party | PSI | in opposition | |
 Jamaica |
People's National Party | PNP | in opposition | Full member since 1952. Temporarily demoted to observer member in 2012 due to non-payment of membership fees. |
 Japan |
Social Democratic Party | SDP | in opposition | Full member since 1951 as the Japan Socialist Party. |
 Kazakhstan |
Nationwide Social Democratic Party | OSDP | N/A | Admitted as consultative member in 2012. Promoted to full member in November 2015. |
 Kyrgyzstan |
Social Democratic Party of Kyrgyzstan | SDPK | in government | Promoted to full member in June 2018. |
 Lebanon |
Progressive Socialist Party | PSP | junior party in coalition | Full member since 1980. |
 Lithuania |
Social Democratic Party of Lithuania | LSDP | junior party in coalition | Full member since the 1990s. |
 Mali |
Alliance for Democracy in Mali | ADEMA-PASJ | in opposition | Admitted as consultative member in 1996. Promoted to full member in 1999. Promoted to full member in 2008. |
| Mali |
Rally for Mali | RPM | in government | Admitted as consultative member in 2003. |
 Mauritania |
Rally of Democratic Forces | RFD | in opposition | Admitted as observer member in 2003. Promoted to full member in 2008. |
 Mauritius |
Labour Party | PT | in opposition | Full member since 1969. |
| Mauritius |
Mauritian Militant Movement | MMM | in opposition | Admitted as consultative member in 1996. Promoted to full member in 2003. Part of the Alliance of the Heart. |
 Mexico |
Institutional Revolutionary Party | PRI | in opposition | Admitted as consultative member in 1996. Promoted to full member in 2003. |
 Moldova |
Democratic Party of Moldova | PDM | junior party in coalition | Admitted as consultative member in 2008. Promoted to full member in 2012. Part of Alliance for European Integration. |
 Mongolia |
Mongolian People's Party | MPP | in government | Admitted (as Mongolian People's Revolutionary Party) as observer member in 1999. Promoted (as Mongolian People's Revolutionary Party) to full member in 2003. |
| Mongolia |
Mongolian Social Democratic Party | MSDP | N/A | Admitted as consultative member in 1992. Promoted to full member in 1996. Merged with others in 2000 to form the Democratic Party |
 Montenegro |
Democratic Party of Socialists of Montenegro | DPS | senior party in coalition | Admitted as consultative member in 2003. Promoted to full member in 2008. |
| Montenegro |
Social Democratic Party of Montenegro | SDP | in opposition | Admitted as observer member in 1996. Promoted to consultative member in 1999. Promoted to full member in 2003. |
 Morocco |
Socialist Union of Popular Forces | USFP | in opposition | Promoted to full member in 1992. |
 Mozambique |
Frelimo Party | FRELIMO | in government | Admitted as consultative member in 1996. Promoted to full member in 1999. |
 Namibia |
South West Africa People's Organisation | SWAPO | in government | Promoted to full member in 2008. |
 Nepal |
Nepali Congress | NC | in opposition | Admitted as consultative member in 1989. Promoted to full member in 1999. |
 Niger |
Nigerien Party for Democracy and Socialism | PNDS | in government | Admitted as consultative member in 1996. Promoted to full member in 2003. |
 Pakistan |
Pakistan Peoples Party | PPP | in opposition | Admitted as consultative member in 1989. Promoted to full member in 2003. |
 Palestine |
Fatah | in government | Admitted as observer member in 1996. Promoted to consultative member in 1999. Promoted to full member in 2012. |
|
 Panama |
Democratic Revolutionary Party | PRD | in opposition | Admitted as consultative member in 1986. Admitted as consultative member in 1996. Promoted to full member in 2003. |
 Paraguay |
Democratic Progressive Party | PDP | in opposition | Admitted as consultative member in 2008. Promoted to full member in November 2015. |
 Peru |
American Popular Revolutionary Alliance | APRA | in opposition | Promoted to full member in 1999. |
 Philippines |
Philippines Democratic Socialist Party | PDSP | in opposition | Admitted as consultative member in 1992. Demoted to observer member in 2012 due to non-payment of membership fees. Delisted in December 2014. Reinstated in 2019. |
 Portugal |
Socialist Party | PS | in government | |
 Puerto Rico |
Puerto Rican Independence Party | PIP | in opposition | Consultative member in 1987, full member in 1994. Promoted to full member in 1992. |
 Romania |
Social Democratic Party | PSD | senior party in coalition | Admitted as consultative member in 1996. Promoted to full member in 1999. Consultative member in 1992, full member in 2001. Admitted as full member in 2003. |
 Russia |
A Just Russia | SR | in opposition | Admitted as observer member in 2008. Promoted to consultative member in 2010. Promoted to full member in 2012. |
 San Marino |
Party of Socialists and Democrats | PSD | in opposition | Consultative member in 1961, full member in 1980. |
 Senegal |
Socialist Party of Senegal | PS | N/A | Full member since the 1970s. Boycotted last election. |
 Slovakia |
Direction – Social Democracy | SMER-SD | senior party in coalition | Full member since 1994. |
 South Africa |
African National Congress | ANC | in government | Admitted as full member in 1999. |
 Spain |
Spanish Socialist Workers' Party | PSOE | in government | Full member since 1951. |
 Tunisia |
Democratic Forum for Labour and Liberties | FDTL | junior party in coalition | Admitted as consultative member in 2003. Demoted to observer member in 2012 due to non-payment of membership fees. Promoted to full member in 2012. |
 Turkey |
Republican People's Party | CHP | in opposition | Took Social Democratic Populist Party's place in 1995. |
 United Kingdom |
Social Democratic and Labour Party | SDLP | in opposition | Full member since 1974. |
 Uruguay |
New Space | PNE | in government | Admitted as consultative member in 1999. Promoted to full member in 2003. |
 Venezuela |
A New Era | UNT | in opposition | Admitted as consultative member in 2013. Promoted to full member in November 2015. |
| Venezuela |
Democratic Action | AD | in opposition | Observer member in 1966, consultative member in 1981, full member mid 1980s. |
| Venezuela |
Popular Will | VP | in opposition | Admitted as full member in December 2014. |
 Yemen |
Yemeni Socialist Party | YSP | in opposition | Admitted as observer member in 2003. Promoted to consultative member in 2008. Promoted to full member in 2012. |
The following parties are consultative parties:
| Country | Name | Abbr | Government | Notes |
|---|---|---|---|---|
 Belize |
People's United Party | PUP | in opposition | Admitted as consultative member in June/July 2014. |
 Botswana |
Botswana Democratic Party | BDP | in government | Admitted as consultative member in June/July 2014. |
| Democratic Republic of the Congo |
Unified Lumumbist Party | PALU | in opposition | Admitted as observer member in December 2014. Upgraded to consultative in 2019. |
 Djibouti |
Movement for Democratic Renewal and Development | MRD | in opposition | Admitted as consultative members in 2019. |
 Gabon |
Gabonese Progress Party | PGP | N/A | Admitted as consultative member in 1996. |
 Gambia |
United Democratic Party | UDP | N/A | Admitted as consultative member in 2012. Boycotted last election. |
 Georgia |
Social Democrats for the Development of Georgia | SDD | N/A | Admitted as consultative member in 2013. |
| Ghana |
Convention People's Party | CPP | Admitted as consultative member in 2018 | |
 Guinea-Bissau |
African Party for the Independence of Guinea and Cape Verde | PAIGC | in government | Admitted as consultative member in 2008. |
| Iran |
Democratic Party of Iranian Kurdistan | PDKI | N/A | Admitted as observer member in 1996. Promoted to consultative member in 2008. |
| Palestine |
Palestinian National Initiative | PNI | in opposition | Admitted as observer member in 2008. Promoted to consultative member in 2012. |
| Palestine |
Palestine Popular Struggle Front | PPSF | Admitted as consultative member in 2018. | |
 Sahrawi Republic |
Polisario Front | POLISARIO | in government | Admitted as observer member in 2008. Promoted to consultative member in 2017. |
 São Tomé and Príncipe |
Movement for the Liberation of São Tomé and Príncipe/Social Democratic Party | MLSTP/PSD | in government | Admitted as consultative member in 2013. |
 Eswatini |
People's United Democratic Movement | PUDEMO | N/A | Admitted as consultative member in 2013. Political parties are banned in Eswatini. |
 Syria |
Democratic Union Party | PYD | Admitted as consultative member in November 2015. | |
 Togo |
Democratic Convention of African Peoples | CDPA | Admitted as consultative member in 1999. | |
| Turkey |
Peoples' Democratic Party | HDP | in opposition | Admitted as consultative member in 2015. |
 Ukraine |
Social Democratic Party of Ukraine | SDPU | N/A | Admitted as consultative member in 2003. |
The following parties are observer parties:
| Country | Name | Abbr | Government | Notes |
|---|---|---|---|---|
 Swaziland |
Swaziland Democratic Party | SWADEPA | Admitted as observer member in June/July 2014. | |
| Iran |
Komala Party of Iranian Kurdistan | KPIK | Admitted as observer member in December 2014. | |
| Iran |
Komala Party of Kurdistan | KPK | Admitted as observer member in December 2014. | |
 Kenya |
Labour Party of Kenya | Admitted as observer member in 2012. | ||
 Kosovo |
Self-determination Movement | VV | Admitted as observer member in 2018. | |
 Lesotho |
Lesotho Congress for Democracy | LCD | in opposition | Admitted as observer member in June/July 2014. |
 Serbia |
Social Democratic Party of Serbia | SDPS | junior party in coalition government | Admitted as observer member in 2018. |
| United Kingdom |
Labour Party | in opposition | Member since 1951. Welsh Labour is in government in the Welsh Assembly, holds the London Mayoralty and London Assembly. The party asked and obtained to be downgraded to observer status in February 2013 "in view of ethical concerns, and to develop international co-operation through new networks." |
| Country | Name | Abbr | Notes | |
|---|---|---|---|---|
| Albania |
Social Democratic Party of Albania | PSD | Admitted as consultative member in 1992. Promoted to full member in 1996. Demoted to observer member in 2012 due to non-payment of membership fees. Delisted in December 2014. | |
| Algeria |
National Liberation Front | FLN | Expelled following the 2019 Algerian protests. | |
| Andorra |
New Democracy | ND | Admitted as consultative member in 1999. | |
 Antigua and Barbuda |
Antigua Labour Party | ALP | Admitted as consultative member in 2008. | |
| Argentina |
Popular Socialist Party | PSP | Admitted as full member in 1992. Merged with the Democratic Socialist Party to form the Socialist Party. | |
| Argentina |
Socialist Party | PS | Full member since 1951. | |
 Aruba |
People's Electoral Movement | MEP | Promoted to full member in 1992. Full member since 1994. Delisted in December 2014. | |
 Australia |
Australian Labor Party | ALP | Admitted as full member in 1966. Delisted in December 2014. | |
 Barbados |
Barbados Labour Party | BLP | Admitted as full member in 1987. Demoted to observer member in 2012 due to non-payment of membership fees. Delisted in December 2014. | |
| Belgium |
Belgian Socialist Party | PSB/BSP | Founder member. Split in 1978. | |
| Belgium |
Socialist Party Different | SP.a | Delisted in 2017. | |
 Benin |
Democratic Union of Progressive Forces | UDFP | Admitted as observer member in 1992. | |
| Benin |
Social Democratic Party | PSD | Admitted as consultative member in 1999. Promoted to full member in 2003. | |
| Bosnia and Herzegovina |
Alliance of Independent Social Democrats | SNSD | Admitted as consultative member in 2003. Promoted to full member in 2008 Expelled in August 2012. | |
| Botswana |
Botswana National Front | BNF | Admitted as observer member in 1996. | |
 Bolivia |
Revolutionary Left Movement | MIR | Admitted as consultative member in 1986. Consultative member in 1987. Promoted to full member in 1992. | |
| Bulgaria |
European Left | BEL | Admitted as observer member in 1999. | |
| Burkina Faso |
Party for Democracy and Progress / Socialist Party | PDP/PS | Admitted as full member circa 1995. Demoted to observer member in 2012 due to non-payment of membership fees. Delisted in December 2014. | |
 Burundi |
Front for Democracy in Burundi | FRODEBU | Admitted as consultative member in 2003. Demoted to observer member in 2012 due to non-payment of membership fees. Delisted in December 2014. |
|
 Canada |
Co-operative Commonwealth Federation | CCF | Became the New Democratic Party in 1961. | |
 Canada |
New Democratic Party | NDP/NPD | Delisted in 2018. | |
| Central African Republic |
Movement for Democracy and Social Progress | MDPS | Admitted as observer member in 1992. | |
 Côte d'Ivoire |
Ivorian Popular Front | FPI | Admitted as consultative member in 1992. Promoted to full member in 1996. Expelled in March 2011. | |
| Colombia |
Alternative Democratic Pole | PDA | Former observer member. Delisted in December 2014. | |
| Colombia |
M-19 Democratic Alliance | Admitted as observer member in 1992. | ||
 Curaçao |
Partido MAN | MAN | Promoted to full member in 1989. Delisted in 2017. | |
 Denmark |
Social Democrats | SD | Founding member. Withdrew in 2017. | |
 Dominica |
Dominica Labour Party | DLP | Admitted as consultative member in 1996. Demoted to observer member in 2012 due to non-payment of membership fees. Delisted in December 2014. | |
 Ecuador |
Democratic Left | PID | Member since 1987. Delisted in 2017. | |
 Egypt |
Egyptian Social Democratic Party | ESDP (or HMDI in Arabic) | Admitted as consultative member in 2012. Promoted to full member in November 2015. Delisted in 2019 due to non-payment of membership fees. | |
| Egypt |
National Democratic Party | NDP | Admitted as full member in 1989. Full member since 1992. Expelled in January 2011. | |
 El Salvador |
Democratic Party | PD | Admitted as observer member in 1996. | |
 Estonia |
Social Democratic Party | SDE | Member since 1990. Withdrew in 2017. | |
 Fiji |
Fiji Labour Party | FLP | Admitted as consultative member in 1992. Expelled in 2008, due to the party's participation in a government issued from a military coup. | |
| Georgia |
Union of Citizens of Georgia | CUG | Admitted as observer member in 1996. | |
 Germany |
Social Democratic Party of Germany | SPD | Founding member. Withdrew in 2017. | |
 Greenland |
Forward | Admitted as consultative member in 1986. Demoted to observer member in 2012 due to non-payment of membership fees. Delisted in December 2014. | ||
| Guatemala |
Social Democratic Convergence | CSD | Admitted as consultative member in 2003. | |
| Haiti |
Party of the National Congress of Democratic Movements | KONAKOM | Admitted as consultative member in 1992. Promoted to full member in 1996. | |
| Haiti |
Struggling People's Organization | OPL | Admitted (as Lavalas Political Organisation) as observer member in 1996. | |
| Haiti |
Revolutionary Progressive Nationalist Party | PANPRA | Admitted as consultative member in 1989. Promoted to full member in 1992. | |
| Hungary |
Social Democratic Party of Hungary | MSZDP | Member since 1990. Admitted as observer member in 1992. Promoted to consultative member in 1999.
Promoted to full member in 2003. |
|
 Iceland |
Social Democratic Party | A | Member since 1987. Formed Social Democratic Alliance in 2000. | |
| Iceland |
Social Democratic Alliance | S | Withdrew in 2017. | |
| Iran |
League of Iranian Socialists | Joined in 1960. It was dissolved in 1980s. | ||
| Italy |
Democratic Party of the Left | PDS | Admitted as full member in 1992. Merged with others to form Democrats of the Left in 1998. | |
| Italy |
Democrats of the Left | DS | Full member since 1992 as Democratic Party of the Left. Merged with other movements to form the Democratic Party in 2007. Listed as SI member until XXIV Congress in 2012. | |
| Italy |
Italian Socialist Party | PSI | Party dissolved in 1994 and succeeded by the Italian Socialists (who formed the Italian Democratic Socialists in 1998 and resumed as the Italian Socialist Party PSI in 2007). | |
| Italy |
Italian Democratic Socialist Party | PSDI | Party merged into the Italian Democratic Socialists in 1998 (renamed into Italian Socialist Party PSI in 2007). | |
| Japan |
Democratic Socialist Party | Minsha-tō | Admitted as SI member in 1961. Merged with non-socialist movements to form the New Frontier Party in 1994. | |
 Jordan |
Jordanian Democratic Party of the Left | JDPL | Admitted as observer member in 2003. | |
| Kyrgyzstan |
Ata Meken Socialist Party | Admitted as observer member in 2008. | ||
 Latvia |
Latvian Social Democratic Workers' Party | LSDSP | Full member since 1994. Demoted to observer member in 2012 due to non-payment of membership fees. Delisted in December 2014. |
|
| Latvia |
Social Democratic Party "Harmony" | SDPS | Admitted as consultative member in June/July 2014. Withdrew in 2017. | |
 Luxembourg |
Luxembourg Socialist Workers' Party | LSAP/POSL | Full member since 1951. Delisted in 2018 for non-payment of membership fees. | |
 Macedonia |
Social Democratic Union of Macedonia | SDSM | Admitted as observer member in 1996. Promoted to full member in 2003. Demoted to observer member in 2012 due to non-payment of membership fees. Delisted in December 2014. | |
 Madagascar |
Party for National Unity | VITM | Admitted as consultative member in 1989. | |
 Malaysia |
Democratic Action Party | DAP | Full member since 1987. Delisted in 2017. | |
 Malta |
Labour Party | PL | Full member since 1955. Demoted to observer member in 2012 due to non-payment of membership fees. Delisted in December 2014. | |
| Mexico |
Party of the Democratic Revolution | PRD | Admitted as full member in 1996. | |
| Moldova |
Social Democratic Party of Moldova | PSDM | Admitted as observer member in 1996. | |
| Namibia |
Congress of Democrats | CoD | Admitted as consultative member in 2003. Demoted to observer member in 2012 due to non-payment of membership fees. Delisted in December 2014. | |
 Netherlands |
Labour Party | PvdA | Decided to minimise involvement in SI in December 2012. Delisted in December 2014. | |
 New Zealand |
New Zealand Labour Party | NZLP | Member since 1952. Demoted to observer member in 2012 due to non-payment of membership fees. Delisted in December 2014. | |
 Nicaragua |
Sandinista National Liberation Front | FSLN | Expelled in January 2019 because of violation of human rights during the Nicaraguan protests | |
 Nigeria |
All Progressives Congress | APC | Admitted as consultative member in December 2014. | |
 North Vietnam |
Vietnamese Socialist Party | Consultative member between 1955 and 1969. | ||
 Norway |
Labour Party | DNA | Member since 1951. Withdrew in 2016. | |
| Paraguay |
Party for a Country of Solidarity | PPS | Admitted as consultative member in 2003. Promoted to full member in 2008. | |
| Paraguay |
Revolutionary Febrerista Party | PRF | Admitted as full member in the 1970s. | |
| Philippines |
Akbayan Citizens' Action Party | AKBAYAN | Admitted as consultative member in 2003. | |
 Poland |
Democratic Left Alliance | SLD | Full member since 1996. Withdrew in 2017. | |
| Poland |
Labour Union | UP | Admitted as full member in 1996. Demoted to observer member in 2012 due to non-payment of membership fees. Delisted in December 2014. |
|
| Poland |
Social Democracy of the Republic of Poland | SdRP | Admitted as full member in 1996. Absorbed into the Democratic Left Alliance in 1999. | |
| Romania |
Democratic Party | PD | Admitted as consultative member in 1996. Promoted to full member in 1999. Merged with the Liberal Democratic Party to form the Democratic Liberal Party. | |
| Russia |
Social Democratic Party of Russia | SDPR | Admitted as consultative member in 2003. | |
 Saint Lucia |
Progressive Labour Party | Expelled in 1992. | ||
 Saint Kitts and Nevis |
Saint Kitts and Nevis Labour Party | SKNLP | Admitted as consultative member in 1992. Demoted to observer member in 2012 due to non-payment of membership fees. Delisted in December 2014. | |
| Saint Lucia |
Saint Lucia Labour Party | SLP | Admitted as consultative member in 1992. Demoted to observer member in 2012 due to non-payment of membership fees. Delisted in December 2014. | |
 Saint Vincent and the Grenadines |
Saint Vincent Labour Party | SVGLP | Admitted as consultative member in 1989. Merged with the Movement for National Unity in 1994 to form the Unity Labour Party. | |
| Saint Vincent and the Grenadines |
Unity Labour Party | ULP | Demoted to observer member in 2012 due to non-payment of membership fees. Delisted in December 2014. | |
| Serbia |
Democratic Party | DS | Admitted as consultative member in 2003. Promoted to full member in 2008. | |
| Serbia |
Social Democratic Party | SDP | Admitted as consultative member in 2003. Promoted to full member in 2008. Demoted to observer member in 2012 due to non-payment of membership fees. Ceased to exist in 2009 |
|
 Singapore |
People's Action Party | PAP | Resigned in 1976 due to Dutch concerns over suppression of free speech. | |
| Slovakia |
Party of the Democratic Left | SDĽ | Admitted as full member in 1996. Merged with Direction – Social Democracy in 2005. | |
| Slovakia |
Social Democratic Party of Slovakia | SDSS | Admitted as full member in 1992. Merged with Direction – Social Democracy in 2005. | |
 Slovenia |
Slovenian Democratic Party | SDS | Admitted (as the Social Democratic Party of Slovenia) as observer member in 1992. | |
| Slovenia |
Social Democrats | SD | Admitted (as United List of Social Democrats) as full member in 1996. Demoted to observer member in 2012 due to non-payment of membership fees. Delisted in December 2014. | |
 Sweden |
Swedish Social Democratic Party | SAP | Withdrew in March 2017. | |
 Switzerland |
Social Democratic Party of Switzerland | SP/PS | Withdrew in 2017. | |
 Tanzania |
Chama Cha Mapinduzi | CCM | Admitted as full member in 2013. | |
 Timor-Leste |
Revolutionary Front for an Independent East Timor | FRETILIN | Admitted as consultative member in 2003. | |
| Tunisia |
Constitutional Democratic Rally | RCD | Admitted as full member in 1989. Full member since 1993. Expelled in January 2011. | |
| Tunisia |
Popular Unity Movement | MUP | Admitted as consultative member in 1989. | |
| Turkey |
Democratic Left Party | DSP | Admitted as consultative member in 1986. Expelled in 1992. | |
| Turkey |
Democratic People's Party | DEHAP | Admitted as observer member in 2003. Merged with the Democratic Society Movement to form the Democratic Society Party which in turn was succeeded by the Peace and Democracy Party. | |
| Turkey |
Social Democracy Party | SODEP | Full member since 1990. Merged with the Republican People's Party in 1995. | |
| Turkey |
Social Democratic Populist Party | SHP | Admitted as consultative member in 1986. Promoted to full member in 1989. Merged with the Republican People's Party in 1995. | |
| Ukraine |
Socialist Party of Ukraine | SPU | Admitted as consultative member in 2003. Expelled in July 2011. | |
 United States |
Democratic Socialists of America | DSA | Had been a member of SI since founding in 1982, withdrew in August 2017. | |
| United States |
Social Democrats, USA | SDUSA | Member since 1972. Withdrew in 2005. | |
| Uruguay |
Party for the Government of the People | PGP | Admitted as consultative member in 1992. Merged with the Colorado Party in 1994. | |
| Uruguay |
Socialist Party of Uruguay | PSUA | Admitted as full member in 1999. Withdrew in 2017. | |
| Venezuela |
For Social Democracy | PODEMOS | Admitted as consultative member in 2008. | |
| Venezuela |
Movement for Socialism | MAS | Admitted as consultative member in 2003. | |
 Zambia |
Patriotic Front | PF | Admitted as consultative member in 2013. | |
 Zimbabwe |
Movement for Democratic Change | MDC | Admitted as full member in 2008. Delisted in 2017. |
