Alongside member parties in EU member states, the PES has member organisations which work for a more progressive Europe.

The PES has five full member organisations, five associated and nine observer organisations.

Political groups in the EU institutions

S&D

Socialists & Democrats in the European Parliament

PES Group

PES Group in the European Committee of the Regions

Sectorial organisations of the PES

PES Women

PES Women

YES

Young European Socialists

Political foundation

FEPS

Foundation for European Progressive Studies

Associated organisations

SOC PACE

Socialist Group in the Parliamentary Assembly of the Council of Europe

OSCE

Socialist Group in the Parliamentary Assembly of the OSCE

Observer organisations

SIW

Socialist International Women (SIW)

IUSY

Internation Union of Socialist Youth

European Forum

European Forum for Democracy and Solidarity

SAMAK

The Joint Committee of the Nordic Social Democratic Labour Movement

IFM-SEI

International Falcon Movement – Socialist Educational International

PES Local

Socialist Local Representatives in Europe

ESO

European Senior Organization

ISDUE

International Social Democratic Union for Education

CEE Gender Network

Central and Eastern European Network for Gender Issues