Full Member Parties
Consultative parties
| Antigua | Antigua Labor Party |
| Azerbaijan | Social Democratic Party of Azerbaijan, ASDP |
| Belarus | Belarusian Social Democratic Party (Narodnaya Hramada), BSDP |
| Burundi | Frodebu |
| Dominica | Dominica Labour Party |
| Gabon | Gabonese Party for Progress, PGP |
| Greenland | SIUMUT |
| Guatemala | Social Democratic Convergence, CSD |
| Guinea-Bissau | African Party of Independence of Guinea and Cape Verde, PAIGC |
| Iran | Democratic Party of Iranian Kurdistan, PDKI |
| Republic of Moldova | Democratic Party, PDM |
| Namibia | Congress of Democrats, CoD |
| Palestine | Fatah |
| Paraguay | Progressive Democratic Party, PDP |
| Philippines | Akbayan, Citizens’ Action Party |
| Philippines | Philippines Democratic Socialist Party, PDSP |
| St. Kitts-Nevis | St. Kitts-Nevis Labour Party |
| St. Lucia | St. Lucia Labour Party, SLP |
| St. Vincent & the Grenadines | Unity Labour Party |
| Timor-Leste | Fretilin |
| Togo | Democratic Convention of African Peoples, CDPA |
| Tunisia | Democratic Forum for Labour and Freedoms, FDTL |
| Ukraine | Socialist Party of Ukraine, SPU |
| Ukraine | Social Democratic Party of Ukraine, SDPU |
| Venezuela | PODEMOS |
| Yemen | Yemeni Socialist Party |
| Pending consultation | |
| Cyprus | Republican Turkish Party, CTP |
Observer parties
| Botswana | Botswana National Front, BNF |
| Bulgaria | Bulgarian Social Democracy, BSD |
| Central African Republic | Patriotic Front for Progress, FPP |
| Central African Republic | Movement for the Liberation of the Central African People, MLPC |
| Colombia | Alternative Democratic Force, PDA |
| Democratic Republic of Congo | Union for Democracy and Social Progress, UDPS |
| Haiti | Organisation of the People in Struggle, OPL |
| India | Janata Dal (secular) |
| Jordan | Jordanian Democratic Party of the Left, JDPL |
| Kyrgyzstan | Ata Meken |
| Republic of Moldova | Social Democratic Party of Moldova |
| Palestine | Palestinian National Initiative, PNI |
| Russian Federation | A Just Russia Party |
| Turkey | Democratic Society Party, DTP |
| Polisario Front |
Fraternal organisations
| International Falcon Movement/Socialist Educational International, IFM/SEI |
| International Union of Socialist Youth, IUSY |
| Socialist International Women, SIW |
Associated organisations
| International Federation of the Socialist and Democratic Press, IFSDP |
| International Labour Sports Confederation, CSIT |
| International League of Religious Socialists, ILRS |
| International Social Democratic Union for Education, ISDUE |
| Jewish Labour Bund, JLB |
| National Democratic Institute for International Affairs, NDI |
| Socialist Group in the European Parliament |
| Party of European Socialists PES |
| Social Democratic Group of the Latin American Parliament |
| World Labour Zionist Movement, WLZM |
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