| Country | Party |
|---|
| Afghanistan | Afghan Social Democratic Party |
| Argentina | Partido Socialista - Socialist Party |
| Australia | Australian Labor Party (ALP) |
| Austria | Sozialdemokratische Partei Österreichs (SPOe) - Social Democratic Party of Austria |
| Belgium | Flemish Socialistische Partij - Anders (SP.a) - Socialist Party - Different |
| Walloon Parti Socialiste (PS) - Socialist Party |
| Bosnia and Herzegovina | Socijaldemokratska partija Bosne i Hercegovine (SDP) - Social Democratic Party of Bosnia and Herzegovina |
| Brazil | Partido da Social Democracia Brasileira (PSDB) - Brazilian Social Democracy Party |
| Partido Democrático Trabalhista (PDT) - Democratic Labour Party |
| Partido dos Trabalhadores (PT) - Worker's Party |
| Canada | Bloc Québécois (BQ) |
| New Democratic Party (NDP) |
| Quebec Parti Québécois (PQ) |
| Quebec Quebec Solidaire |
| Colombia | Colombian Liberal Party |
| Costa Rica | Partido Liberación Nacional (PLN) - National Liberation Party |
| Croatia | Socijaldemokratska partija Hrvatske - Social Democratic Party of Croatia |
| Chile | Socialist Party(Partido Socialista) - Party for Democracy (Partido Por la Democracia) |
| Czech Republic | Česká strana sociálně demokratická (ČSSD) - Czech Social Democratic Party |
| Denmark | Socialdemokraterne - Social Democrats |
| Estonia | Sotsiaaldemokraatlik Erakond (SDE) - Social Democratic Party |
| Ethiopia | (ESDFP) - Social Democratic Party |
| Finland | Social Democratic Party of Finland (SDP) |
| France | Parti Socialiste (PS) - Socialist Party |
| Germany | Sozialdemokratische Partei Deutschlands (SPD) - Social Democratic Party of Germany |
| Greece | Πανελλήνιο Σοσιαλίστικο Κινήμα / Panellínio Sosialistíko Kiníma (ΠΑΣΟΚ / PASOK) - Panhellenic Socialist Movement |
| Hong Kong | Civic Party |
| League of Social Democrats |
| The Frontier |
| Hungary | Magyar Szocialista Párt (MSZP) - Hungarian Socialist Party |
| Iceland | Samfylkingin - Alliance |
| India | Indian National Congress (INC) |
| DMK - Dravida Munnetra Kazhagam |
| Samajwadi Party - Socialist Party |
| Indonesia | Partai Demokrasi Indonesia-Perjuangan (PDI-P) - Indonesian_Democratic_Party_–_Struggle |
| Iran | Organization of Iranian People's Fedaian (Majority) |
| Republic of Ireland | Páirtí an Lucht Oibre - Labour Party |
| Israel | העבודה, Ha‘Avoda - Labor |
| מרצ-יחד - Meretz-Yachad |
| Italy | Democratici di Sinistra (DS) - Democrats of the Left |
| Japan | 社会民主党, Shakai Minshu-tō - Social Democratic Party (SDP) |
| Kazakhstan | Zhalpyulttyk Sotsial-Demokratiyalyk Partiya - Nationwide Social Democratic Party |
| Kenya | Madaraka Party of Kenya |
| Latvia | Latvijas Sociāldemokrātiskā strādnieku partija (LSDSP) - Latvian Social Democratic Workers' Party |
| Socialdemokrātu savienība (SDS) - Social Democratic Union |
| Lebanon | Democratic Left Movement (Lebanon) |
| Progressive Socialist Party |
| Luxembourg | Lëtzebuergesch Sozialistesch Arbechterpartei - Luxembourg Socialist Workers' Party |
| Malta | Malta Labour Party |
| Mexico | Partido de la Revolución Democrática - Party of the Democratic Revolution |
| Partido Alternativa Socialdemócrata y Campesina - Social Democratic and Peasant Alternative Party |
| Mongolia | Монгол Ардын Хувьсгалт Нам (MAXH), Mongol Ardyn Khuv'sgatt Nam (MAKN) - Mongolian People's Revolutionary Party (MPRP) |
| Netherlands | Partij van de Arbeid (PvdA) - Labour Party |
| Socialistische Partij - Socialist Party |
| New Zealand | New Zealand Labour Party |
| Norway | Det norske Arbeiderparti(A) - Norwegian Labour Party |
| Pakistan | پاکستان پیپلز پارٹی - Pakistan Peoples Party (PPP) |
| Poland | RACJA Polskiej Lewicy (RACJA PL) - REASON of Polish Left |
| Sojusz Lewicy Demokratycznej (SLD) - Democratic Left Alliance |
| Socjaldemokracja Polska (SDPL) - Social Democratic Party of Poland |
| Unia Lewicy - Union of the Left |
| Portugal | Partido Socialista - Socialist Party |
| Puerto Rico | Partido Independentista Pertorriqueño Puerto Rican Independence Party (PIP) |
| Romania | Partidul Social Democrat (PSD) - Social Democratic Party |
| Russia | Russian Social Democratic Labour Party |
| Serbia | Демократска странка / Demokratska stranka (ДC - DS) - Democratic Party |
| Liga socijaldemokrata Vojvodine (LSV) - League of Social Democrats of Vojvodina |
| Socijaldemokratska unija (SDU) - Social Democratic Union |
| Singapore | Workers' Party of Singapore |
| Slovakia | Smer—sociálna demokracia - Direction - Social Democracy |
| South Africa | African National Congress (ANC) |
| South Korea | Democratic Labour Party |
| Spain | Partido Socialista Obrero Español (PSOE) - Spanish Socialist Workers' Party |
| Spain | Eusko Alkartasuna - Basque Socialdemocracy (EA) |
| Sweden | Sveriges socialdemokratiska arbetarparti (SAP) - Swedish Social Democratic Party |
| Switzerland | Sozialdemokratische Partei der Schweiz (SPS)
Parti socialiste suisse (PSS)
Partito Socialista Svizzero (PSS)
Partida Socialdemocrata de la Svizra (PSS)
Social Democratic Party of Switzerland[1] |
| Turkey | Cumhuriyet Halk Partisi (CHP) - Republican People's Party |
| Demokratik Sol Parti (DSP) - Democratic Left Party |
| Sosyal Demokrat Halk Partisi (SHP) - Social Democratic People's Party |
| Özgürlük ve Dayanışma Partisi (ÖDP) - Freedom and Solidarity Party |
| United Kingdom | Labour Party |
| Social Democratic and Labour Party (SDLP) (Northern Ireland only) |
| Progressive Unionist Party (PUP) (Northern Ireland only) |
| Scottish National Party (SNP) (Scotland only) |
| Plaid Cymru (Wales only) |
| Mebyon Kernow (MK) (Cornwall only) |
| United States | Democratic Socialists of America (DSA) |
| Labor Party |
| Social Democratic Party of Pennsylvania |
| United States Territories | The Puerto Rican Independence Party (PIP) Arguably a Social Democratic Party within the United States, since Puerto Rico's independence is not recognised by the US Government; nevertheless, the Puerto Rican Independence Party is a full-flegged member of the Socialist International (SI). |
