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Socialist International
Parties of Socialist International.svg
Countries with members of Socialist International
Abbreviation SI
Predecessor Labour and Socialist International
Formation 3 June 1951; 72 years ago (1951-06-03)
Type International non-governmental organisation
Purpose "Strengthen relations between the affiliated parties and to coordinate their political attitudes and activities"
Location
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)

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.

History

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.

Presidents

In 2006, George Papandreou, leader of the Panhellenic Socialist Movement, became the president of the Socialist International.

Honorary Presidents

  • Ruben Berrios Martinez

Congresses

Members

Full members

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 Northern Cyprus 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 Northern Cyprus 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.
 Guinea 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.
Flag of Mexico.svg Mexico Institutional Revolutionary Party PRI in opposition Admitted as consultative member in 1996. Promoted to full member in 2003.
Flag of Moldova.svg 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.

Consultative parties

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.

Observer parties

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."

Former members

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.
Flag of Mexico.svg Mexico Party of the Democratic Revolution PRD Admitted as full member in 1996.
Flag of Moldova.svg 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.
NicaraguaNicaragua 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.

Fraternal organisations

Associated organisations

  • International Federation of the Socialist and Democratic Press
  • International Labour Sports Confederation
  • International League of Religious Socialists
  • International Union of Social Democratic Teachers
  • Jewish Labour Bund
  • National Democratic Institute for International Affairs
  • Parliamentary Group of the Party of European Socialists
  • Party of European Socialists
  • Social Democratic Group of the Latin American Parliament
  • World Labour Zionist Movement

Images for kids

See also

Kids robot.svg In Spanish: Internacional Socialista para niños

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