Young European Socialists (YES) is the youth organisation of the PES. It unites young socialists and social democrats from all over Europe to campaign and organise at the European level.

YES – formerly ECOSY – unites young socialist, social democratic and labour movements from all over Europe to campaign and organise at the European level, and to provide a forum for debate, advocacy, capacity-building and exchange for all European young socialist activists.

YES works for a democratic, environmental, social, feminist and federal Europe, promotes a clear socialist and social democratic vision for its future and combats inequality, social injustice and right-wing and extremist policies. Their vision for Europe is a united democratic community based on, and globally active for, individual and collective human rights and freedoms.