In 2016, ECOS membership includes 42 well-respected members, including 9 pan-European organisations and 33 national organisations from 22 European countries.

If you are interested in becoming a member of ECOS, please follow the guidelines available here

Pan-European organisations

European Environmental Bureau (EEB)

Friends of the Earth Europe (FoEE)

Health Care Without Harm Europe (HCWH-Europe)

Health & Environment Alliance (HEAL)

European umbrella for social enterprises with activities in reuse, repair and recycling (RREUSE)

European Federation for Transport and Environment (T&E)

WWF-European Policy Office


National organisations

  • Austria


  • Belgium

Bond Beter Leefmilieu Vlaanderen (BBLV)

Inter-Environnement Wallonie asbl (IEW)

  • Bulgaria

Institute for Ecological Modernisation (IEM)

  • Croatia

Door-Logo-VerticalSociety for Sustainable Development and Design (DOOR)

  • Cyprus

Terra Cypria – the Cyprus Conservation Foundation

  • Czech Republic

Zelený Kruh (Green Circle)

  • Denmark

Denmarks Naturfredningsforening (DN)

Danish Ecological Council (DOR)


  • France

France Nature Environnement (FNE)

zero waste france

Zero Waste France

Women in Europe for a Common Future – France (WECF)

  • Germany

Friends of the Earth Germany (BUND)

Bundesverband Bürgerinitiativen Umweltschutz (BBU)

Deutscher Naturschutzring (DNR)

Nature Friends Germany (NFD)

  • Greece


Ecocity National Governmental Organization (ECOCITY)


  • Hungary

levegoClean Air Action Group (CAAG)

  • Italy

Legambiente Onlus

  • Latvia

Friends of the Earth Latvia

  • Luxemburg

Oekozenter Pafendall

  • Netherlands

Stichting Natuur en Milieu (SNM)


  • Norway


  • Poland

clientearth-logo-2-cmClientEarth Poland 

Polish Foundation for Energy Efficiency (FEWE)

  • Portugal



  • Spain


  • Sweden

Swedish Society for Nature Conservation (SNF)


  • Switzerland

WWF Switzerland


  • United Kingdom

energy saving trust logoEnergy Saving Trust


UK SNSUK Sustainability Network for Standardisation (UK SNS)


  • United States

green science policy instituteGreen Science Policy Institute