Zwiazek Stowarzyszen Polska Zielona Siec (Polska Zielona Siec – PZS) – Alliance of Associations Polish Green Network (Polish Green Network – PGN) is a national alliance of 10 strongest environmental and sustainable development associations and foundations based in the largest cities of Poland. PGN regularly cooperates with about 30 civic society organizations.
PGN was created in 1995.

The main areas of its activities are advocating for social and environmental justice within sustainable development, establishing social control mechanisms over public funds, increasing consumers impact on multinational corporations, building public support for development and providing development assistance in the Global South countries and Eastern Europe.