| CDU |
Christlich Demokratische Union (German Christian Democratic Party) |
| CPS |
Confederation of Socialist Parties of the European Community |
| DC |
Democrazia Christiana (Italian Christian Democratic Party) |
| DNA |
Det Norske Arbeiderparti (Norwegian Labour Party) |
| EPP |
European People’s Party |
| FDP |
Freie Demokratische Partei (German Free Democratic Party) |
| FN |
Front National (France) |
| FPÖ |
Freiheitliche Partei Österreichs (Austrian Freedom Party) |
| IU |
Izquierda Unida (United Left, Spain) |
| KKE |
Kommounistiko Komma Elladas (Greek Communist Party) |
| ÖVP |
Österreichs Volkspartei (Austrian People’s Party) |
| PASOK |
Panellinio Sosialistiko Kinima (Pan-Hellenic Socialist Movement) |
| PCF |
Parti Communiste Français (French Communist Party) |
| PCI |
Partito Comunista Italiano (Italian Communist Party) |
| PDS |
Partei des Demokratischen Socialismus (Democratic Socialist Party, Germany) |
| PDS |
Partito Democratico della Sinistra (Democratic Party of the Left, Italy) |
| PES |
Party of European Socialists |
| PS |
Parti Socialiste (Socialist Party, France) |
| PSB |
Parti Socialiste Belge (Belgian Socialist Party) |
| PSI |
Partito Socialista Italiano (Italian Socialist Party) |
| PSOE |
Partido Socialista Obrero Español (Spanish Socialist Workers Party) |
| PSP |
Partido Socialista Português (Portuguese Socialist Party) |
| PvdA |
Partij van de Arbeid (Labour Party, Holland) |
| SAP |
Social demokratiska Arbetarepartiet (Swedish Social-Democratic Party) |
| SD |
Social demokratiet (Danish Social-Democratic Party) |
| SF |
Socialistik Folkeparti (Socialist People’s Party, Denmark) |
| SFIO |
Section Française de l’Internationale Ouvrière (France) |
| SPD |
Sozialdemokratische Partei Deutschlands (German Social-Democratic Party) |
| SPÖ |
Sozialistische Partei Österreichs (Austrian Socialist Party, Austrian Social-Democratic Party since 1991) |