| Austria | Social Democratic Party of Austria (SPÖ) | |
| Belgium | Socialist Party (SPA) | |
| Brazil | Brazilian Socialist Party (PSB) | |
| Cameroon | Social Democratic Front (SDF) | |
| Croatia | Social Democratic Party (SDP) | |
| Cyprus | Republican Turkish Party (CTP) | |
| Denmark | Social Democratic Party | |
| DR Congo | Union for Democracy and Social Progress (UDPS) |
| Egypt | Egyptian Social Democratic Party (ESDP) | |
| Equatorial Guinea | Convergence for Social Democracy (CPDS) | |
| Eritrea | Eritrean People‘s Democratic Party (EPDP) | |
| France | Socialist Party (PS) | |
| Germany | Social Democratic Party of Germany (SPD) | |
| Great Britain | Labour Party (LP) | |
| Guinea | Guinean People‘s Assembly (RPG) | |
| Hungary | Social Democrats (Szocdemek) |
| India | India Association for Democratic Socialism | |
| Iran | Komala Iranian Kurdistan Party | |
| Iran | Komala Iranian Kurdistan Party | |
| Iraq | Kurdistan Socialist Democratic Party (KSDP) |
| Iraq | Patriotic Union of Kurdistan (PUK) |
| Italy | Democratic Party (PD) | |
| Ivory Coast | Cap Union for Democracy and Development (CAP-UDD) |
| Kenya | Labour Party of Kenya (KLP) | |
| Lebanon | Progressive Socialist Party (PSP) | |
| Lithuania | Lithuanian Social Democratic Party (LSDP) | |
| Macedonia | The Social Democratic Union of Macedonia (SDUM) |
| Malaysia | Democratic Action Party (DAP) | |
| Mauritius | Mauritius Militant Movement (MMM) | |
| Mexico | Party of Democratic Revolution (PRD) | |
| Montenegro | Democratic Party of Socialists of Montenegro (DPS) |
| Morocco | Socialist Union of Popular Forces (USFP) | |
| Netherlands | Labour Party (PvdA) | |
| Norway | Norwegian Labour Party (DNA) | |
| Palestine | Fatah | |
| Palestine | Palestinian National Initiative (PNI) | |
| Philippines | Citizens‘ Action Party (Akbayan) | |
| Romania | Social Democratic Party (PSD) | |
| Russia | A Just Russia Party | |
| Senegal | Socialist Party (PS) | |
| Serbia | New Democratic Party | |
| Somalia | Somali Social Unity Party (SSUP) | |
| Spain | Spanish Socialist Workers‘ Party (PSOE) | |
| Sweden | Swedish Social Democratic Party (SAP) | |
| Switzerland | Social Democratic Party of Switzerland (SP) |
| Tunisia | Ettakatol | |
| Tunisia | Tunisian Labour Party (TLP) | |
| Turkey | Republican People‘s Party (CHP) | |
| Uruguay | Socialist Party of Uruguay (PSU) | |
| Western Sahara | Frente Polisario | |
| Yemen | Yemeni Socialist Party (YSP) | |
| Zimbabwe | Movement for Democratic Change (MDC-T) |
| Foundation for European Progressive Studies (FEPS) | |
| Foundation Jean JaurèsFoundation Max van der Stoel (FMS) | |
| Friedrich-Ebert-Foundation (FES) | |
| Group of Socialists & Democrats in the European Parliament (S&D-Group) | |
| International Union of Socialist Youth (IUSY) | |
| Party of European Socialists (PES) | |
| Party of European Socialist Women (PES Women) | |
| Solidar | |
| Tunisian General Labour Union (UGTT) | |
| Young European Socialists (YES) | |
