| ountry | National Member Party | Euro. Party | Subgroup |
| a href="/encyclopedia/Cyprus" title="Cyprus">Cyprus | bgcolor="lightcoral"|Progressive Party of Working People | bgcolor="lightcoral"|EL-obs | bgcolor="lightcoral"|UEL |
| a href="/encyclopedia/Czech-Republic" title="Czech Republic">Czech Republic | bgcolor="lightcoral"|Communist Party of Bohemia and Moravia | bgcolor="lightcoral"|EL-obs | bgcolor="lightcoral"|UEL |
| a href="/encyclopedia/Finland" title="Finland">Finland | bgcolor="darkseagreen"|Left Alliance | bgcolor="darkseagreen"|NGLA | bgcolor="darkseagreen"|NGL |
| a href="/encyclopedia/France" title="France">France | bgcolor="tomato"|Parti Communiste Franais | bgcolor="tomato"|EL | bgcolor="tomato"|UEL |
| a href="/encyclopedia/Germany" title="Germany">Germany | bgcolor="tomato"|Party of Democratic Socialism | bgcolor="tomato"|EL | bgcolor="tomato"|UEL |
| owspan="2"|Greece | bgcolor="tomato"|Synaspismos | bgcolor="tomato"|EL | bgcolor="tomato"|UEL |
| gcolor="lightcoral"|Communist Party of Greece | bgcolor="lightcoral"|none | bgcolor="lightcoral"|UEL |
| a href="/encyclopedia/Ireland" title="Ireland">Ireland | bgcolor="lightcoral"|Sinn Fin | bgcolor="lightcoral"|none | bgcolor="lightcoral"|UEL |
| owspan="2"|Italy | bgcolor="tomato"|Rifondazione Comunista | bgcolor="tomato"|EL | bgcolor="tomato"|UEL |
| gcolor="lightcoral"|Party of the Italian Communists | bgcolor="lightcoral"|EL-obs | bgcolor="lightcoral"|UEL |
| a href="/encyclopedia/Netherlands" title="Netherlands">Netherlands | bgcolor="lightcoral"|Socialist Party | bgcolor="lightcoral"|none | bgcolor="lightcoral"|UEL |
| a href="/encyclopedia/Portugal" title="Portugal">Portugal | bgcolor="lightcoral"|Portuguese Communist Party | bgcolor="lightcoral"|none | bgcolor="lightcoral"|UEL |
| a href="/encyclopedia/Slovakia" title="Slovakia">Slovakia | bgcolor="lightcoral"|Communist Party of Slovakia | bgcolor="lightcoral"|EL-obs | bgcolor="lightcoral"|UEL |
| a href="/encyclopedia/Spain" title="Spain">Spain | bgcolor="tomato"|Izquierda Unida | bgcolor="tomato"|EL | bgcolor="tomato"|UEL |
| a href="/encyclopedia/Sweden" title="Sweden">Sweden | bgcolor="darkseagreen"|Left Party | bgcolor="darkseagreen"|NGLA | bgcolor="darkseagreen"|NGL |
| olspan="4"|Associate Parties with MEPs |
| a href="/encyclopedia/Portugal" title="Portugal">Portugal | bgcolor="lightcoral"|Leftwing Block | bgcolor="lightcoral"|EL-obs | bgcolor="lightcoral"|UEL |
| olspan="4"|Associate Parties without MEPs |
| a href="/encyclopedia/Luxembourg" title="Luxembourg">Luxembourg | bgcolor="lightcoral"|The Left | bgcolor="lightcoral"|EL-obs | bgcolor="lightcoral"|UEL |
| olspan="4"|Associate Parties from outside the EU |
| a href="/encyclopedia/Norway" title="Norway">Norway | bgcolor="darkseagreen"|Socialist Left Party | bgcolor="darkseagreen"|NGLA | bgcolor="darkseagreen"|NGL |
| a href="/encyclopedia/Switzerland" title="Switzerland">Switzerland | bgcolor="tomato"|Swiss Workers' Party | bgcolor="tomato"|EL | bgcolor="tomato"|UEL |
| olspan="4"|Parties with MEPs as Associate Members of the Parliamentary Group |
| a href="/encyclopedia/Denmark" title="Denmark">Denmark | bgcolor="lightcoral"|Folkebevaegelsen | bgcolor="lightcoral"|none | bgcolor="lightcoral"|UEL |