This chapter focuses on non-state actors in global environmental governance. Non-state actors, such as non-governmental organisations (NGOs), corporations, and transnational networks, play an increasingly significant role in global environmental politics. Some of them, such as Greenpeace and Shell, became well known by communicating directly with the public or consumers. Others, such as the Indigenous Peoples' International Centre for Policy Research and Education or the International Council for Local Environmental Initiatives, are less visible to the wider public but no less influential. The scope, diversity, preferences, methods of engagement, and contributions of non-state actors to global environmental governance are often overshadowed by a focus on state actors. The chapter sheds light on how non-state actors engage in global environmental governance and highlights how they shape the political landscape in this field.