Socialist International
Political international
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| 2025 | Malta Labour Party rejoins the Socialist International after previous delisting. |
| 2024 | UK Labour Party wins majority in Westminster during the United Kingdom general election. |
| 2022 | Twenty-sixth Socialist International summit held in Madrid, Spain for the second time. |
| 2022 | Benedicta Lasi from Ghana succeeds Luis Ayala as Secretary General, marking a new leadership transition for the Socialist International. |
| November 25 2022 | Pedro Sánchez from the Spanish Socialist Workers' Party becomes the ninth president of the Socialist International, succeeding George Papandreou. |
| March 2022 | A Just Russia — Patriots — For Truth party expelled for supporting the Russian invasion of Ukraine |
| 2019 | Philippines' Democratic Socialist Party reinstated after previous delisting. |
| 2019 | Movement for Democratic Renewal and Development (MRD) from Djibouti admitted as consultative members. |
| 2019 | Unified Lumumbist Party (PALU) upgraded from observer to consultative member status. |
| January 2019 | Expulsion of multiple parties, including Egypt's National Democratic Party and Nicaragua's Sandinista National Liberation Front, due to various political reasons. |
| 2018 | Central African Republic's Movement for the Liberation of the Central African People upgraded to full membership. Social Democratic Assembly for the Progress of Haiti admitted as full members. |
| 2018 | Vetëvendosje from Kosovo and Social Democratic Party of Serbia (SDPS) admitted as observer members of the Socialist International. |
| 2018 | Social Democratic Party of Serbia (SDPS) admitted as an observer member of the Socialist International. |
| 2018 | Vetëvendosje from Kosovo admitted as an observer member of the Socialist International. |
| 2018 | Palestinian Popular Struggle Front (PPSF) admitted as a consultative member. |
| 2018 | Convention People's Party (CPP) from Ghana admitted as a consultative member. |
| 2018 | Komala Party of Iranian Kurdistan (KPIK) promoted from observer to consultative member status. |
| 2017 | Polisario Front promoted from observer to consultative member status. |
| 2017 | Twenty-fifth Socialist International summit took place in Cartagena, Colombia. |
| August 2017 | Democratic Socialists of America withdrew from the Socialist International. |
| March 2017 | Bolivia's National Unity Front and North Cyprus's Communal Democracy Party promoted to full membership. |
| March 2017 | Multiple parties withdrew from Socialist International, including Swedish Social Democratic Party and Swiss Social Democratic Party |
| 2016 | Burkina Faso's People's Movement for Progress admitted as a full member. |
| November 2015 | Belarus' Social Democratic Party promoted to full member. |
| November 2015 | Belarus's Social Democratic Party and Kazakhstan's Social Democratic Party promoted to full membership. |
| November 2015 | Democratic Union Party (PYD) from Syria admitted as a consultative member. |
| 2014 | Komala Party of Iranian Kurdistan (KPIK) admitted as an observer member. |
| December 2014 | Indian National Congress readmitted as a full member. Popular Will from Venezuela admitted as a full member. |
| December 2014 | Mass delisting of member parties due to non-payment of membership fees, including parties from Albania, Aruba, Australia, Barbados, Colombia, Dominica, Greenland, Latvia, Netherlands, New Zealand, and others. |
| December 2014 | Unified Lumumbist Party (PALU) from the Democratic Republic of the Congo admitted as an observer member. |
| December 2014 | Indian National Congress is readmitted as a full member. |
| November 2014 | Kazakhstan's Nationwide Social Democratic Party promoted to full member. |
| June 2014 | Swazi Democratic Party (SWADEPA) from Eswatini and Lesotho Congress for Democracy (LCD) admitted as observer members of the Socialist International. |
| June 2014 | Swazi Democratic Party (SWADEPA) from Eswatini admitted as an observer member of the Socialist International. |
| June 2014 | Lesotho Congress for Democracy (LCD) admitted as an observer member of the Socialist International. |
| June 2014 | Botswana Democratic Party (BDP) admitted as a consultative member of the Socialist International. |
| 2013 | Justice and Welfare Party from Somaliland admitted as an observer member of the Socialist International. |
| 2013 | People's United Democratic Movement (PUDEMO) from Eswatini admitted as a consultative member. |
| 2013 | Movement for the Liberation of São Tomé and Príncipe/Social Democratic Party (MLSTP/PSD) admitted as a consultative member. |
| 2013 | Social Democrats for the Development of Georgia (SDD) admitted as a consultative member. |
| May 22 2013 | The Social Democratic Party of Germany and other member parties founded the Progressive Alliance, a rival international network of social-democratic parties, splitting from the Socialist International due to concerns about the organization's democratic processes and membership. |
| February 2013 | UK Labour Party requested to be downgraded to observer status due to ethical concerns and to develop international cooperation through new networks. |
| 2012 | Palestine's Fatah promoted to full member. Several parties experience membership changes. |
| 2012 | Labour Party of Kenya admitted as an observer member of the Socialist International. |
| 2012 | United Democratic Party (UDP) from The Gambia admitted as a consultative member. |
| 2012 | Palestinian National Initiative (PNI) promoted from observer to consultative member status. |
| 2012 | Twenty-fourth Socialist International summit organized in Cape Town, South Africa. |
| 2012 | Major European parties began allowing their Socialist International membership to lapse or downgrade to observer status, including the SPD, Swedish Social Democratic Party, British Labour Party, and Norwegian Labour Party, signaling a significant organizational shift. |
| 2012 | SI Congress in Cape Town approved the expulsions of parties from Tunisia, Egypt, and Ivory Coast in line with the organization's statutes. |
| December 2012 | Malta Labour Party delisted from the Socialist International due to non-payment of membership fees. |
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