B

• Bulgarian Socialist Party‎ (1 C, 5 P)

C

• Chama Cha Mapinduzi‎ (1 C, 16 P, 1 F)
• Citizens' Action Party (Costa Rica)‎ (1 C, 5 P)
• Czech Social Democratic Party‎ (3 C, 22 P)

D

• Democratic Left Alliance‎ (1 C, 9 P)
• Democratic Party (Italy)‎ (3 C, 13 P)
• Democratic Party (United States)‎ (15 C, 54 P)
• Democratic Party of Moldova‎ (1 C, 1 P)

F

• Farabundo Martí National Liberation Front‎ (1 C, 10 P)
• Fatah‎ (3 C, 7 P)

H

• Hungarian Socialist Party‎ (2 C, 3 P)

I

• Indian National Congress‎ (10 C, 63 P)
• Israeli Labor Party‎ (3 C, 7 P)

L

• Labour Party (Ireland)‎ (1 C, 18 P, 1 F)
• Labour Party (Netherlands)‎ (1 C, 15 P)
• Labour Party (Norway)‎ (4 C, 18 P)
• Labour Party (UK)‎ (6 C, 8 P, 1 F)

M

• Meretz‎ (2 C, 7 P)
• Mongolian People's Party‎ (1 C, 5 P)
• Movimiento al Socialismo‎ (1 C, 7 P)
• MPLA‎ (2 C, 16 P, 1 F)

N

• Nepali Congress‎ (1 C, 17 P)
• New Democratic Party (Canada)‎ (6 C, 12 P)
• New Zealand Labour Party‎ (2 C, 46 P, 1 F)

P

• Party of the Democratic Revolution‎ (1 C, 9 P)
• PASOK‎ (1 C, 19 P)
• Progressive Socialist Party‎ (1 C, 6 P)

R

• Republican People's Party (Turkey)‎ (5 C, 54 P)

S

• Samajwadi Party‎ (2 C, 7 P)
• Social Democratic Party (Romania)‎ (1 C, 7 P)
• Social Democratic Party of Austria‎ (1 C, 21 P)
• Social Democratic Party of Croatia‎ (1 C, 4 P)
• Social Democratic Party of Finland‎ (2 C, 7 P)
• Social Democratic Party of Germany‎ (2 C, 69 P)
• Social Democratic Party of Switzerland‎ (1 C, 5 P)
• Social Democrats (Denmark)‎ (1 C, 4 P)
• Socialist Party (France)‎ (3 C, 23 P, 1 F)
• Socialist Party (Portugal)‎ (1 C, 7 P)
• Socialist Party of Chile‎ (1 C, 6 P)
• Spanish Socialist Workers' Party‎ (3 C, 26 P)

W

• Workers' Party (Brazil)‎ (1 C, 9 P)

Y

• Yemeni Socialist Party‎ (1 C, 9 P)

• Progressive Alliance

A

• Akbayan
• Australian Labor Party

B

• Brazilian Socialist Party

C

• Chama Cha Mapinduzi
• Citizens' Movement (Mexico)
• Convergence for Social Democracy (Equatorial Guinea)

D

• Democratic Action Party
• Democratic Forum for Labour and Liberties
• Democratic Party (Cyprus)
• Democratic Party (Italy)
• Democratic Party (Serbia)
• Democratic Party (South Korea, 2013)
• Democratic Party for a New Society
• Democratic Party of Socialists of Montenegro

E

• Egyptian Social Democratic Party
• European Social Democratic Party

F

• Fearless Movement
• Fretilin

G

• Georgian Dream
• Guasú Front

I

• Indian National Congress
• Indonesian Democratic Party of Struggle
• International Union of Socialist Youth
• Israeli Labor Party

K

• Democratic Party of Iranian Kurdistan

L

• Labour Party (Ireland)
• Labour Party (Norway)
• Luxembourg Socialist Workers' Party

M

• Mauritian Militant Movement
• Meretz
• Modern Revolutionary Party
• Mongolian People's Revolutionary Party (2010)
• EDEK Socialist Party
• Movement for the Liberation of São Tomé and Príncipe – Social Democratic Party
• Movement for the Liberation of the Central African People

N

• Nasdem Party
• National Democratic Congress (Ghana)
• National Democratic Congress (Grenada)
• National Party (Pakistan)
• New Democratic Party
• New Zealand Labour Party
• Nigerien Party for Democracy and Socialism

P

• Palestinian National Initiative
• Party for Democracy (Chile)
• PASOK
• PASOK – Movement for Change
• People's United Democratic Movement
• Progressive Alliance of Socialists and Democrats
• Progressive Convergence
• Progressive Socialist Party

R

• Rally of the Guinean People
• Republican Turkish Party

S

• Samajwadi Party
• Social Democratic Front (Cameroon)
• Social Democratic Party (Romania)
• Social Democratic Party (Serbia)
• Social Democratic Party "Harmony"
• Social Democratic Party of Croatia
• Social Democratic Party of Finland
• Social Democratic Party of Germany
• Social Democratic Party of Lithuania
• Social Democratic Party of Montenegro
• Social Democratic Party of Switzerland
• Social Democratic Union of Macedonia
• Social Democrats (Denmark)
• Social Democrats (Slovenia)
• Socialist Party (Argentina)
• Socialist Party (Belgium)
• Socialist Party (Portugal)
• Socialist Party of Senegal
• Socialist Party of Uruguay
• Socialist Union of Popular Forces
• Spanish Socialist Workers' Party
• Swazi Democratic Party
• Swedish Social Democratic Party
• Syrian Democratic People's Party

U

• Union for Democracy and Social Progress (Democratic Republic of the Congo)

V

• Vetëvendosje
• Vooruit (political party)

Y

• Young European Socialists